Hawkin
/
arangodb
mirror of https://gitee.com/bigwinds/arangodb
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
arangodb/arangod/Cluster/ClusterInfo.cpp

3271 lines
113 KiB
C++
Raw Blame History

////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
/// http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Max Neunhoeffer
/// @author Jan Steemann
////////////////////////////////////////////////////////////////////////////////
#include "ClusterInfo.h"
#include "Basics/ConditionLocker.h"
#include "Basics/Exceptions.h"
#include "Basics/MutexLocker.h"
#include "Basics/ReadLocker.h"
#include "Basics/StringUtils.h"
#include "Basics/VelocyPackHelper.h"
#include "Basics/WriteLocker.h"
#include "Basics/hashes.h"
#include "Cluster/ClusterHelpers.h"
#include "Cluster/ServerState.h"
#include "Logger/Logger.h"
#include "Rest/HttpResponse.h"
#include "RestServer/DatabaseFeature.h"
#include "StorageEngine/PhysicalCollection.h"
#include "Utils/Events.h"
#include "VocBase/LogicalCollection.h"
#include "VocBase/LogicalView.h"
#ifdef USE_ENTERPRISE
#include "Enterprise/VocBase/SmartVertexCollection.h"
#include "Enterprise/VocBase/VirtualCollection.h"
#endif
#include <velocypack/Builder.h>
#include <velocypack/Collection.h>
#include <velocypack/Iterator.h>
#include <velocypack/Slice.h>
#include <velocypack/velocypack-aliases.h>
#ifdef _WIN32
// turn off warnings about too long type name for debug symbols blabla in MSVC
// only...
#pragma warning(disable : 4503)
#endif
using namespace arangodb;
static std::unique_ptr<ClusterInfo> _instance;
////////////////////////////////////////////////////////////////////////////////
/// @brief a local helper to report errors and messages
////////////////////////////////////////////////////////////////////////////////
static inline int setErrormsg(int ourerrno, std::string& errorMsg) {
errorMsg = TRI_errno_string(ourerrno);
return ourerrno;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief check whether the JSON returns an error
////////////////////////////////////////////////////////////////////////////////
static inline bool hasError(VPackSlice const& slice) {
return arangodb::basics::VelocyPackHelper::getBooleanValue(slice, "error",
false);
}
////////////////////////////////////////////////////////////////////////////////
/// @brief extract the error message from a JSON
////////////////////////////////////////////////////////////////////////////////
static std::string extractErrorMessage(std::string const& shardId,
VPackSlice const& slice) {
std::string msg = " shardID:" + shardId + ": ";
// add error message text
msg += arangodb::basics::VelocyPackHelper::getStringValue(slice,
"errorMessage", "");
// add error number
if (slice.hasKey(StaticStrings::ErrorNum)) {
VPackSlice const errorNum = slice.get(StaticStrings::ErrorNum);
if (errorNum.isNumber()) {
msg += " (errNum=" + arangodb::basics::StringUtils::itoa(
errorNum.getNumericValue<uint32_t>()) +
")";
}
}
return msg;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief creates an empty collection info object
////////////////////////////////////////////////////////////////////////////////
CollectionInfoCurrent::CollectionInfoCurrent(uint64_t currentVersion)
: _currentVersion(currentVersion) {}
////////////////////////////////////////////////////////////////////////////////
/// @brief destroys a collection info object
////////////////////////////////////////////////////////////////////////////////
CollectionInfoCurrent::~CollectionInfoCurrent() {}
////////////////////////////////////////////////////////////////////////////////
/// @brief create the clusterinfo instance
////////////////////////////////////////////////////////////////////////////////
void ClusterInfo::createInstance(
AgencyCallbackRegistry* agencyCallbackRegistry) {
_instance.reset(new ClusterInfo(agencyCallbackRegistry));
}
////////////////////////////////////////////////////////////////////////////////
/// @brief returns an instance of the cluster info class
////////////////////////////////////////////////////////////////////////////////
ClusterInfo* ClusterInfo::instance() { return _instance.get(); }
////////////////////////////////////////////////////////////////////////////////
/// @brief creates a cluster info object
////////////////////////////////////////////////////////////////////////////////
ClusterInfo::ClusterInfo(AgencyCallbackRegistry* agencyCallbackRegistry)
: _agency(), _agencyCallbackRegistry(agencyCallbackRegistry),
_planVersion(0), _currentVersion(0), _uniqid() {
_uniqid._currentValue = 1ULL;
_uniqid._upperValue = 0ULL;
// Actual loading into caches is postponed until necessary
}
////////////////////////////////////////////////////////////////////////////////
/// @brief destroys a cluster info object
////////////////////////////////////////////////////////////////////////////////
ClusterInfo::~ClusterInfo() {}
////////////////////////////////////////////////////////////////////////////////
/// @brief cleanup method which frees cluster-internal shared ptrs on shutdown
////////////////////////////////////////////////////////////////////////////////
void ClusterInfo::cleanup() {
ClusterInfo* theInstance = instance();
if (theInstance == nullptr) {
return;
}
theInstance->_plannedCollections.clear();
theInstance->_shards.clear();
theInstance->_shardKeys.clear();
theInstance->_shardIds.clear();
theInstance->_currentCollections.clear();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief increase the uniqid value. if it exceeds the upper bound, fetch a
/// new upper bound value from the agency
////////////////////////////////////////////////////////////////////////////////
uint64_t ClusterInfo::uniqid(uint64_t count) {
while (true) {
uint64_t oldValue;
{
// The quick path, we have enough in our private reserve:
MUTEX_LOCKER(mutexLocker, _idLock);
if (_uniqid._currentValue + count - 1 <= _uniqid._upperValue) {
uint64_t result = _uniqid._currentValue;
_uniqid._currentValue += count;
return result;
}
oldValue = _uniqid._currentValue;
}
// We need to fetch from the agency
uint64_t fetch = count;
if (fetch < MinIdsPerBatch) {
fetch = MinIdsPerBatch;
}
uint64_t result = _agency.uniqid(fetch, 0.0);
{
MUTEX_LOCKER(mutexLocker, _idLock);
if (oldValue == _uniqid._currentValue) {
_uniqid._currentValue = result + count;
_uniqid._upperValue = result + fetch - 1;
return result;
}
// If we get here, somebody else tried succeeded in doing the same,
// so we just try again.
}
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief flush the caches (used for testing)
////////////////////////////////////////////////////////////////////////////////
void ClusterInfo::flush() {
loadServers();
loadCurrentDBServers();
loadCurrentCoordinators();
loadPlan();
loadCurrent();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief ask whether a cluster database exists
////////////////////////////////////////////////////////////////////////////////
bool ClusterInfo::doesDatabaseExist(DatabaseID const& databaseID, bool reload) {
int tries = 0;
if (reload || !_planProt.isValid || !_currentProt.isValid ||
!_DBServersProt.isValid) {
loadPlan();
loadCurrent();
loadCurrentDBServers();
++tries; // no need to reload if the database is not found
}
// From now on we know that all data has been valid once, so no need
// to check the isValid flags again under the lock.
while (true) {
{
size_t expectedSize;
{
READ_LOCKER(readLocker, _DBServersProt.lock);
expectedSize = _DBServers.size();
}
// look up database by name:
READ_LOCKER(readLocker, _planProt.lock);
// _plannedDatabases is a map-type<DatabaseID, VPackSlice>
auto it = _plannedDatabases.find(databaseID);
if (it != _plannedDatabases.end()) {
// found the database in Plan
READ_LOCKER(readLocker, _currentProt.lock);
// _currentDatabases is
// a map-type<DatabaseID, a map-type<ServerID, VPackSlice>>
auto it2 = _currentDatabases.find(databaseID);
if (it2 != _currentDatabases.end()) {
// found the database in Current
return ((*it2).second.size() >= expectedSize);
}
}
}
if (++tries >= 2) {
break;
}
loadPlan();
loadCurrent();
loadCurrentDBServers();
}
return false;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief get list of databases in the cluster
////////////////////////////////////////////////////////////////////////////////
std::vector<DatabaseID> ClusterInfo::databases(bool reload) {
std::vector<DatabaseID> result;
if (_clusterId.empty()) {
loadClusterId();
}
if (reload || !_planProt.isValid || !_currentProt.isValid ||
!_DBServersProt.isValid) {
loadPlan();
loadCurrent();
loadCurrentDBServers();
}
// From now on we know that all data has been valid once, so no need
// to check the isValid flags again under the lock.
size_t expectedSize;
{
READ_LOCKER(readLocker, _DBServersProt.lock);
expectedSize = _DBServers.size();
}
{
READ_LOCKER(readLockerPlanned, _planProt.lock);
READ_LOCKER(readLockerCurrent, _currentProt.lock);
// _plannedDatabases is a map-type<DatabaseID, VPackSlice>
auto it = _plannedDatabases.begin();
while (it != _plannedDatabases.end()) {
// _currentDatabases is:
// a map-type<DatabaseID, a map-type<ServerID, VPackSlice>>
auto it2 = _currentDatabases.find((*it).first);
if (it2 != _currentDatabases.end()) {
if ((*it2).second.size() >= expectedSize) {
result.push_back((*it).first);
}
}
++it;
}
}
return result;
}
/// @brief Load cluster ID
void ClusterInfo::loadClusterId() {
// Contact agency for /<prefix>/Cluster
AgencyCommResult result = _agency.getValues("Cluster");
// Parse
if (result.successful()) {
VPackSlice slice = result.slice()[0].get(
std::vector<std::string>({AgencyCommManager::path(), "Cluster"}));
if(slice.isString()) {
_clusterId = slice.copyString();
}
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief (re-)load the information about our plan
/// Usually one does not have to call this directly.
////////////////////////////////////////////////////////////////////////////////
//
static std::string const prefixPlan = "Plan";
void ClusterInfo::loadPlan() {
DatabaseFeature* databaseFeature =
application_features::ApplicationServer::getFeature<DatabaseFeature>(
"Database");
++_planProt.wantedVersion; // Indicate that after *NOW* somebody has to
// reread from the agency!
MUTEX_LOCKER(mutexLocker, _planProt.mutex); // only one may work at a time
uint64_t storedVersion = _planProt.wantedVersion; // this is the version
// we will set in the end
LOG_TOPIC(TRACE, Logger::CLUSTER) << "loadPlan: wantedVersion="
<< storedVersion << ", doneVersion=" << _planProt.doneVersion;
if (_planProt.doneVersion == storedVersion) {
// Somebody else did, what we intended to do, so just return
return;
}
// Now contact the agency:
AgencyCommResult result = _agency.getValues(prefixPlan);
if (result.successful()) {
VPackSlice slice = result.slice()[0].get(
std::vector<std::string>({AgencyCommManager::path(), "Plan"}));
auto planBuilder = std::make_shared<VPackBuilder>();
planBuilder->add(slice);
VPackSlice planSlice = planBuilder->slice();
if (planSlice.isObject()) {
uint64_t newPlanVersion = 0;
VPackSlice planVersionSlice = planSlice.get("Version");
if (planVersionSlice.isNumber()) {
try {
newPlanVersion = planVersionSlice.getNumber<uint64_t>();
} catch (...) {
}
}
LOG_TOPIC(TRACE, Logger::CLUSTER) << "loadPlan: newPlanVersion="
<< newPlanVersion;
if (newPlanVersion == 0) {
LOG_TOPIC(WARN, Logger::CLUSTER)
<< "Attention: /arango/Plan/Version in the agency is not set or not "
"a positive number.";
}
decltype(_plannedDatabases) newDatabases;
decltype(_plannedCollections) newCollections; // map<string /*database id*/
// ,map<string /*collection id*/
// ,shared_ptr<LogicalCollection>
// >
// >
decltype(_shards) newShards;
decltype(_shardServers) newShardServers;
decltype(_shardKeys) newShardKeys;
decltype(_plannedViews) newViews;
bool swapDatabases = false;
bool swapCollections = false;
bool swapViews = false;
VPackSlice databasesSlice;
databasesSlice = planSlice.get("Databases");
if (databasesSlice.isObject()) {
for (auto const& database : VPackObjectIterator(databasesSlice)) {
std::string const& name = database.key.copyString();
newDatabases.insert(std::make_pair(name, database.value));
}
swapDatabases = true;
}
// Immediate children of "Collections" are database names, then ids
// of collections, then one JSON object with the description:
// "Plan":{"Collections": {
// "_system": {
// "3010001": {
// "deleted": false,
// "doCompact": true,
// "id": "3010001",
// "indexBuckets": 8,
// "indexes": [
// {
// "fields": [
// "_key"
// ],
// "id": "0",
// "sparse": false,
// "type": "primary",
// "unique": true
// }
// ],
// "isSmart": false,
// "isSystem": true,
// "isVolatile": false,
// "journalSize": 1048576,
// "keyOptions": {
// "allowUserKeys": true,
// "lastValue": 0,
// "type": "traditional"
// },
// "name": "_graphs",
// "numberOfSh ards": 1,
// "path": "",
// "replicationFactor": 2,
// "shardKeys": [
// "_key"
// ],
// "shards": {
// "s3010002": [
// "PRMR-bf44d6fe-e31c-4b09-a9bf-e2df6c627999",
// "PRMR-11a29830-5aca-454b-a2c3-dac3a08baca1"
// ]
// },
// "status": 3,
// "statusString": "loaded",
// "type": 2,
// "waitForSync": false
// },...
// },...
// }}
databasesSlice = planSlice.get("Collections"); //format above
if (databasesSlice.isObject()) {
bool isCoordinator = ServerState::instance()->isCoordinator();
for (auto const& databasePairSlice :
VPackObjectIterator(databasesSlice)) {
VPackSlice const& collectionsSlice = databasePairSlice.value;
if (!collectionsSlice.isObject()) {
continue;
}
DatabaseCollections databaseCollections;
std::string const databaseName = databasePairSlice.key.copyString();
TRI_vocbase_t* vocbase = nullptr;
if (isCoordinator) {
vocbase = databaseFeature->lookupDatabaseCoordinator(databaseName);
} else {
vocbase = databaseFeature->lookupDatabase(databaseName);
}
if (vocbase == nullptr) {
// No database with this name found.
// We have an invalid state here.
continue;
}
for (auto const& collectionPairSlice :
VPackObjectIterator(collectionsSlice)) {
VPackSlice const& collectionSlice = collectionPairSlice.value;
if (!collectionSlice.isObject()) {
continue;
}
std::string const collectionId =
collectionPairSlice.key.copyString();
decltype(vocbase->lookupCollection(collectionId)->clusterIndexEstimates()) selectivityEstimates;
double selectivityTTL = 0;
if (isCoordinator) {
auto collection = _plannedCollections[databaseName][collectionId];
if(collection){
selectivityEstimates = collection->clusterIndexEstimates(/*do not update*/ true);
selectivityTTL = collection->clusterIndexEstimatesTTL();
}
}
try {
std::shared_ptr<LogicalCollection> newCollection;
#if defined(USE_ENTERPRISE)
VPackSlice isSmart = collectionSlice.get("isSmart");
if (isSmart.isTrue()) {
VPackSlice type = collectionSlice.get("type");
if (type.isInteger() && type.getUInt() == TRI_COL_TYPE_EDGE) {
newCollection = std::make_shared<VirtualSmartEdgeCollection>(
*vocbase, collectionSlice, newPlanVersion
);
} else {
newCollection = std::make_shared<SmartVertexCollection>(
*vocbase, collectionSlice, newPlanVersion
);
}
} else
#endif
{
newCollection = std::make_shared<LogicalCollection>(
*vocbase, collectionSlice, true, newPlanVersion
);
}
auto& collectionName = newCollection->name();
if (isCoordinator && !selectivityEstimates.empty()){
LOG_TOPIC(TRACE, Logger::CLUSTER) << "copy index estimates";
newCollection->clusterIndexEstimates(std::move(selectivityEstimates));
newCollection->clusterIndexEstimatesTTL(selectivityTTL);
for(auto i : newCollection->getIndexes()){
i->updateClusterEstimate();
}
}
// register with name as well as with id:
databaseCollections.emplace(
std::make_pair(collectionName, newCollection));
databaseCollections.emplace(
std::make_pair(collectionId, newCollection));
auto shardKeys = std::make_shared<std::vector<std::string>>(
newCollection->shardKeys());
newShardKeys.insert(make_pair(collectionId, shardKeys));
auto shardIDs = newCollection->shardIds();
auto shards = std::make_shared<std::vector<std::string>>();
for (auto const& p : *shardIDs) {
shards->push_back(p.first);
newShardServers.emplace(p.first, p.second);
}
// Sort by the number in the shard ID ("s0000001" for example):
std::sort(shards->begin(), shards->end(),
[](std::string const& a, std::string const& b) -> bool {
return std::strtol(a.c_str() + 1, nullptr, 10) <
std::strtol(b.c_str() + 1, nullptr, 10);
});
newShards.emplace(std::make_pair(collectionId, shards));
} catch (std::exception const& ex) {
// The plan contains invalid collection information.
// This should not happen in healthy situations.
// If it happens in unhealthy situations the
// cluster should not fail.
LOG_TOPIC(ERR, Logger::AGENCY)
<< "Failed to load information for collection '" << collectionId
<< "': " << ex.what() << ". invalid information in plan. The"
"collection will be ignored for now and the invalid information"
"will be repaired. VelocyPack: "
<< collectionSlice.toJson();
TRI_ASSERT(false);
continue;
} catch (...) {
// The plan contains invalid collection information.
// This should not happen in healthy situations.
// If it happens in unhealthy situations the
// cluster should not fail.
LOG_TOPIC(ERR, Logger::AGENCY)
<< "Failed to load information for collection '" << collectionId
<< ". invalid information in plan. The collection will "
"be ignored for now and the invalid information will "
"be repaired. VelocyPack: "
<< collectionSlice.toJson();
TRI_ASSERT(false);
continue;
}
}
newCollections.emplace(
std::make_pair(databaseName, databaseCollections));
swapCollections = true;
}
}
// Immediate children of "Views" are database names, then ids
// of views, then one JSON object with the description:
// "Plan":{"Views": {
// "_system": {
// "654321": {
// "id": "654321",
// "name": "v",
// "collections": [
// <list of cluster-wide collection IDs of linked collections>
// ]
// },...
// },...
// }}
// Now the same for views:
databasesSlice = planSlice.get("Views"); // format above
if (databasesSlice.isObject()) {
bool isCoordinator = ServerState::instance()->isCoordinator();
for (auto const& databasePairSlice :
VPackObjectIterator(databasesSlice)) {
VPackSlice const& viewsSlice = databasePairSlice.value;
if (!viewsSlice.isObject()) {
continue;
}
DatabaseViews databaseViews;
std::string const databaseName = databasePairSlice.key.copyString();
TRI_vocbase_t* vocbase = nullptr;
if (isCoordinator) {
vocbase = databaseFeature->lookupDatabaseCoordinator(databaseName);
} else {
vocbase = databaseFeature->lookupDatabase(databaseName);
}
if (vocbase == nullptr) {
// No database with this name found.
// We have an invalid state here.
continue;
}
for (auto const& viewPairSlice :
VPackObjectIterator(viewsSlice)) {
VPackSlice const& viewSlice = viewPairSlice.value;
if (!viewSlice.isObject()) {
continue;
}
std::string const viewId =
viewPairSlice.key.copyString();
try {
const auto newView = LogicalView::create(
*vocbase, viewPairSlice.value, newPlanVersion
);
if (!newView) {
LOG_TOPIC(ERR, Logger::AGENCY)
<< "Failed to create view '" << viewId
<< "'. The view will be ignored for now and the invalid information "
"will be repaired. VelocyPack: "
<< viewSlice.toJson();
}
std::string const viewName = newView->name();
// register with name as well as with id:
databaseViews.emplace(std::make_pair(viewName, newView));
databaseViews.emplace(std::make_pair(viewId, newView));
} catch (std::exception const& ex) {
// The Plan contains invalid view information.
// This should not happen in healthy situations.
// If it happens in unhealthy situations the
// cluster should not fail.
LOG_TOPIC(ERR, Logger::AGENCY)
<< "Failed to load information for view '" << viewId
<< "': " << ex.what() << ". invalid information in Plan. The "
"view will be ignored for now and the invalid information "
"will be repaired. VelocyPack: "
<< viewSlice.toJson();
TRI_ASSERT(false);
continue;
} catch (...) {
// The Plan contains invalid view information.
// This should not happen in healthy situations.
// If it happens in unhealthy situations the
// cluster should not fail.
LOG_TOPIC(ERR, Logger::AGENCY)
<< "Failed to load information for view '" << viewId
<< ". invalid information in Plan. The view will "
"be ignored for now and the invalid information will "
"be repaired. VelocyPack: "
<< viewSlice.toJson();
TRI_ASSERT(false);
continue;
}
}
newViews.emplace(
std::make_pair(databaseName, databaseViews));
swapViews = true;
}
}
WRITE_LOCKER(writeLocker, _planProt.lock);
_plan = planBuilder;
_planVersion = newPlanVersion;
if (swapDatabases) {
_plannedDatabases.swap(newDatabases);
}
if (swapCollections) {
_plannedCollections.swap(newCollections);
_shards.swap(newShards);
_shardKeys.swap(newShardKeys);
_shardServers.swap(newShardServers);
}
if (swapViews) {
_plannedViews.swap(newViews);
}
_planProt.doneVersion = storedVersion;
_planProt.isValid = true; // will never be reset to false
} else {
LOG_TOPIC(ERR, Logger::CLUSTER) << "\"Plan\" is not an object in agency";
}
return;
}
LOG_TOPIC(DEBUG, Logger::CLUSTER)
<< "Error while loading " << prefixPlan
<< " httpCode: " << result.httpCode()
<< " errorCode: " << result.errorCode()
<< " errorMessage: " << result.errorMessage()
<< " body: " << result.body();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief (re-)load the information about current databases
/// Usually one does not have to call this directly.
////////////////////////////////////////////////////////////////////////////////
static std::string const prefixCurrent = "Current";
void ClusterInfo::loadCurrent() {
++_currentProt.wantedVersion; // Indicate that after *NOW* somebody has to
// reread from the agency!
MUTEX_LOCKER(mutexLocker, _currentProt.mutex); // only one may work at a time
uint64_t storedVersion = _currentProt.wantedVersion; // this is the version
// we will set at the end
if (_currentProt.doneVersion == storedVersion) {
// Somebody else did, what we intended to do, so just return
return;
}
// Now contact the agency:
AgencyCommResult result = _agency.getValues(prefixCurrent);
if (result.successful()) {
velocypack::Slice slice = result.slice()[0].get(
std::vector<std::string>({AgencyCommManager::path(), "Current"}));
auto currentBuilder = std::make_shared<VPackBuilder>();
currentBuilder->add(slice);
VPackSlice currentSlice = currentBuilder->slice();
if (currentSlice.isObject()) {
uint64_t newCurrentVersion = 0;
VPackSlice currentVersionSlice = currentSlice.get("Version");
if (currentVersionSlice.isNumber()) {
try {
newCurrentVersion = currentVersionSlice.getNumber<uint64_t>();
} catch (...) {
}
}
if (newCurrentVersion == 0) {
LOG_TOPIC(WARN, Logger::CLUSTER)
<< "Attention: /arango/Current/Version in the agency is not set or "
"not a positive number.";
}
decltype(_currentDatabases) newDatabases;
decltype(_currentCollections) newCollections;
decltype(_shardIds) newShardIds;
bool swapDatabases = false;
bool swapCollections = false;
VPackSlice databasesSlice = currentSlice.get("Databases");
if (databasesSlice.isObject()) {
for (auto const& databaseSlicePair :
VPackObjectIterator(databasesSlice)) {
std::string const database = databaseSlicePair.key.copyString();
if (!databaseSlicePair.value.isObject()) {
continue;
}
std::unordered_map<ServerID, VPackSlice> serverList;
for (auto const& serverSlicePair :
VPackObjectIterator(databaseSlicePair.value)) {
serverList.insert(std::make_pair(serverSlicePair.key.copyString(),
serverSlicePair.value));
}
newDatabases.insert(std::make_pair(database, serverList));
}
swapDatabases = true;
}
databasesSlice = currentSlice.get("Collections");
if (databasesSlice.isObject()) {
for (auto const& databaseSlice : VPackObjectIterator(databasesSlice)) {
std::string const databaseName = databaseSlice.key.copyString();
DatabaseCollectionsCurrent databaseCollections;
for (auto const& collectionSlice :
VPackObjectIterator(databaseSlice.value)) {
std::string const collectionName = collectionSlice.key.copyString();
auto collectionDataCurrent =
std::make_shared<CollectionInfoCurrent>(newCurrentVersion);
for (auto const& shardSlice :
VPackObjectIterator(collectionSlice.value)) {
std::string const shardID = shardSlice.key.copyString();
collectionDataCurrent->add(shardID, shardSlice.value);
// Note that we have only inserted the CollectionInfoCurrent under
// the collection ID and not under the name! It is not possible
// to query the current collection info by name. This is because
// the correct place to hold the current name is in the plan.
// Thus: Look there and get the collection ID from there. Then
// ask about the current collection info.
// Now take note of this shard and its responsible server:
auto servers = std::make_shared<std::vector<ServerID>>(
collectionDataCurrent->servers(shardID));
newShardIds.insert(make_pair(shardID, servers));
}
databaseCollections.insert(
std::make_pair(collectionName, collectionDataCurrent));
}
newCollections.emplace(
std::make_pair(databaseName, databaseCollections));
}
swapCollections = true;
}
// Now set the new value:
WRITE_LOCKER(writeLocker, _currentProt.lock);
_current = currentBuilder;
_currentVersion = newCurrentVersion;
if (swapDatabases) {
_currentDatabases.swap(newDatabases);
}
if (swapCollections) {
LOG_TOPIC(TRACE, Logger::CLUSTER)
<< "Have loaded new collections current cache!";
_currentCollections.swap(newCollections);
_shardIds.swap(newShardIds);
}
_currentProt.doneVersion = storedVersion;
_currentProt.isValid = true; // will never be reset to false
} else {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Current is not an object!";
}
return;
}
LOG_TOPIC(ERR, Logger::CLUSTER) << "Error while loading " << prefixCurrent
<< " httpCode: " << result.httpCode()
<< " errorCode: " << result.errorCode()
<< " errorMessage: " << result.errorMessage()
<< " body: " << result.body();
}
/// @brief ask about a collection
/// If it is not found in the cache, the cache is reloaded once
/// if the collection is not found afterwards, this method will throw an exception
std::shared_ptr<LogicalCollection> ClusterInfo::getCollection(
DatabaseID const& databaseID, CollectionID const& collectionID) {
int tries = 0;
if (!_planProt.isValid) {
loadPlan();
++tries;
}
while (true) { // left by break
{
READ_LOCKER(readLocker, _planProt.lock);
// look up database by id
AllCollections::const_iterator it = _plannedCollections.find(databaseID);
if (it != _plannedCollections.end()) {
// look up collection by id (or by name)
DatabaseCollections::const_iterator it2 =
(*it).second.find(collectionID);
if (it2 != (*it).second.end()) {
return (*it2).second;
}
}
}
if (++tries >= 2) {
break;
}
// must load collections outside the lock
loadPlan();
}
THROW_ARANGO_EXCEPTION_MESSAGE(
TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND,
"Collection not found: " + collectionID + " in database " + databaseID);
}
////////////////////////////////////////////////////////////////////////////////
/// @brief ask about all collections
////////////////////////////////////////////////////////////////////////////////
std::vector<std::shared_ptr<LogicalCollection>> const
ClusterInfo::getCollections(DatabaseID const& databaseID) {
std::vector<std::shared_ptr<LogicalCollection>> result;
// always reload
loadPlan();
READ_LOCKER(readLocker, _planProt.lock);
// look up database by id
AllCollections::const_iterator it = _plannedCollections.find(databaseID);
if (it == _plannedCollections.end()) {
return result;
}
// iterate over all collections
DatabaseCollections::const_iterator it2 = (*it).second.begin();
while (it2 != (*it).second.end()) {
char c = (*it2).first[0];
if (c < '0' || c > '9') {
// skip collections indexed by id
result.push_back((*it2).second);
}
++it2;
}
return result;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief ask about a collection in current. This returns information about
/// all shards in the collection.
/// If it is not found in the cache, the cache is reloaded once.
////////////////////////////////////////////////////////////////////////////////
std::shared_ptr<CollectionInfoCurrent> ClusterInfo::getCollectionCurrent(
DatabaseID const& databaseID, CollectionID const& collectionID) {
int tries = 0;
if (!_currentProt.isValid) {
loadCurrent();
++tries;
}
while (true) {
{
READ_LOCKER(readLocker, _currentProt.lock);
// look up database by id
AllCollectionsCurrent::const_iterator it =
_currentCollections.find(databaseID);
if (it != _currentCollections.end()) {
// look up collection by id
DatabaseCollectionsCurrent::const_iterator it2 =
(*it).second.find(collectionID);
if (it2 != (*it).second.end()) {
return (*it2).second;
}
}
}
if (++tries >= 2) {
break;
}
// must load collections outside the lock
loadCurrent();
}
return std::make_shared<CollectionInfoCurrent>(0);
}
//////////////////////////////////////////////////////////////////////////////
/// @brief ask about a view
/// If it is not found in the cache, the cache is reloaded once. The second
/// argument can be a collection ID or a view name (both cluster-wide).
//////////////////////////////////////////////////////////////////////////////
std::shared_ptr<LogicalView> ClusterInfo::getView(
DatabaseID const& databaseID, ViewID const& viewID) {
int tries = 0;
if (!_planProt.isValid) {
loadPlan();
++tries;
}
while (true) { // left by break
{
READ_LOCKER(readLocker, _planProt.lock);
// look up database by id
AllViews::const_iterator it = _plannedViews.find(databaseID);
if (it != _plannedViews.end()) {
// look up view by id (or by name)
DatabaseViews::const_iterator it2 =
(*it).second.find(viewID);
if (it2 != (*it).second.end()) {
return (*it2).second;
}
}
}
if (++tries >= 2) {
break;
}
// must load plan outside the lock
loadPlan();
}
THROW_ARANGO_EXCEPTION_MESSAGE(
TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND,
"View not found: " + viewID + " in database " + databaseID);
}
//////////////////////////////////////////////////////////////////////////////
/// @brief ask about all views of a database
//////////////////////////////////////////////////////////////////////////////
std::vector<std::shared_ptr<LogicalView>> const ClusterInfo::getViews(
DatabaseID const& databaseID) {
std::vector<std::shared_ptr<LogicalView>> result;
// always reload
loadPlan();
READ_LOCKER(readLocker, _planProt.lock);
// look up database by id
AllViews::const_iterator it = _plannedViews.find(databaseID);
if (it == _plannedViews.end()) {
return result;
}
// iterate over all collections
DatabaseViews::const_iterator it2 = (*it).second.begin();
while (it2 != (*it).second.end()) {
char c = (*it2).first[0];
if (c < '0' || c > '9') {
// skip collections indexed by id
result.push_back((*it2).second);
}
++it2;
}
return result;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief create database in coordinator, the return value is an ArangoDB
/// error code and the errorMsg is set accordingly. One possible error
/// is a timeout, a timeout of 0.0 means no timeout.
////////////////////////////////////////////////////////////////////////////////
int ClusterInfo::createDatabaseCoordinator(std::string const& name,
VPackSlice const& slice,
std::string& errorMsg,
double timeout) {
AgencyComm ac;
AgencyCommResult res;
double const realTimeout = getTimeout(timeout);
double const endTime = TRI_microtime() + realTimeout;
double const interval = getPollInterval();
auto DBServers =
std::make_shared<std::vector<ServerID>>(getCurrentDBServers());
std::shared_ptr<int> dbServerResult = std::make_shared<int>(-1);
std::shared_ptr<std::string> errMsg = std::make_shared<std::string>();
std::function<bool(VPackSlice const& result)> dbServerChanged =
[=](VPackSlice const& result) {
size_t numDbServers = DBServers->size();
if (result.isObject() && result.length() >= numDbServers) {
// We use >= here since the number of DBservers could have increased
// during the creation of the database and we might not yet have
// the latest list. Thus there could be more reports than we know
// servers.
VPackObjectIterator dbs(result);
std::string tmpMsg = "";
bool tmpHaveError = false;
for (VPackObjectIterator::ObjectPair dbserver : dbs) {
VPackSlice slice = dbserver.value;
if (arangodb::basics::VelocyPackHelper::getBooleanValue(
slice, "error", false)) {
tmpHaveError = true;
tmpMsg += " DBServer:" + dbserver.key.copyString() + ":";
tmpMsg += arangodb::basics::VelocyPackHelper::getStringValue(
slice, StaticStrings::ErrorMessage, "");
if (slice.hasKey(StaticStrings::ErrorNum)) {
VPackSlice errorNum = slice.get(StaticStrings::ErrorNum);
if (errorNum.isNumber()) {
tmpMsg += " (errorNum=";
tmpMsg += basics::StringUtils::itoa(
errorNum.getNumericValue<uint32_t>());
tmpMsg += ")";
}
}
}
}
if (tmpHaveError) {
*errMsg = "Error in creation of database:" + tmpMsg;
*dbServerResult = TRI_ERROR_CLUSTER_COULD_NOT_CREATE_DATABASE;
return true;
}
*dbServerResult = setErrormsg(TRI_ERROR_NO_ERROR, *errMsg);
}
return true;
};
// ATTENTION: The following callback calls the above closure in a
// different thread. Nevertheless, the closure accesses some of our
// local variables. Therefore we have to protect all accesses to them
// by a mutex. We use the mutex of the condition variable in the
// AgencyCallback for this.
auto agencyCallback = std::make_shared<AgencyCallback>(
ac, "Current/Databases/" + name, dbServerChanged, true, false);
_agencyCallbackRegistry->registerCallback(agencyCallback);
TRI_DEFER(_agencyCallbackRegistry->unregisterCallback(agencyCallback));
AgencyOperation newVal("Plan/Databases/" + name,
AgencyValueOperationType::SET, slice);
AgencyOperation incrementVersion("Plan/Version",
AgencySimpleOperationType::INCREMENT_OP);
AgencyPrecondition precondition("Plan/Databases/" + name,
AgencyPrecondition::Type::EMPTY, true);
AgencyWriteTransaction trx({newVal, incrementVersion}, precondition);
res = ac.sendTransactionWithFailover(trx, realTimeout);
if (!res.successful()) {
if (res._statusCode ==
(int)arangodb::rest::ResponseCode::PRECONDITION_FAILED) {
return setErrormsg(TRI_ERROR_ARANGO_DUPLICATE_NAME, errorMsg);
}
errorMsg = std::string("Failed to create database at ") +
__FILE__ + ":" + std::to_string(__LINE__);
return setErrormsg(TRI_ERROR_CLUSTER_COULD_NOT_CREATE_DATABASE_IN_PLAN,
errorMsg);
}
// Now update our own cache of planned databases:
loadPlan();
{
CONDITION_LOCKER(locker, agencyCallback->_cv);
int count = 0; // this counts, when we have to reload the DBServers
while (true) {
errorMsg = *errMsg;
if (++count >=
static_cast<int>(getReloadServerListTimeout() / interval)) {
// We update the list of DBServers every minute in case one of them
// was taken away since we last looked. This also helps (slightly)
// if a new DBServer was added. However, in this case we report
// success a bit too early, which is not too bad.
loadCurrentDBServers();
*DBServers = getCurrentDBServers();
count = 0;
}
if (*dbServerResult >= 0) {
loadCurrent(); // update our cache
return *dbServerResult;
}
if (TRI_microtime() > endTime) {
return setErrormsg(TRI_ERROR_CLUSTER_TIMEOUT, errorMsg);
}
agencyCallback->executeByCallbackOrTimeout(getReloadServerListTimeout() /
interval);
}
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief drop database in coordinator, the return value is an ArangoDB
/// error code and the errorMsg is set accordingly. One possible error
/// is a timeout, a timeout of 0.0 means no timeout.
////////////////////////////////////////////////////////////////////////////////
int ClusterInfo::dropDatabaseCoordinator(std::string const& name,
std::string& errorMsg,
double timeout) {
AgencyComm ac;
AgencyCommResult res;
double const realTimeout = getTimeout(timeout);
double const endTime = TRI_microtime() + realTimeout;
double const interval = getPollInterval();
std::shared_ptr<int> dbServerResult = std::make_shared<int>(-1);
std::function<bool(VPackSlice const& result)> dbServerChanged =
[=](VPackSlice const& result) {
if (result.isObject() && result.length() == 0) {
*dbServerResult = 0;
}
return true;
};
std::string where("Current/Databases/" + name);
// ATTENTION: The following callback calls the above closure in a
// different thread. Nevertheless, the closure accesses some of our
// local variables. Therefore we have to protect all accesses to them
// by a mutex. We use the mutex of the condition variable in the
// AgencyCallback for this.
auto agencyCallback =
std::make_shared<AgencyCallback>(ac, where, dbServerChanged, true, false);
_agencyCallbackRegistry->registerCallback(agencyCallback);
TRI_DEFER(_agencyCallbackRegistry->unregisterCallback(agencyCallback));
// Transact to agency
AgencyOperation delPlanDatabases("Plan/Databases/" + name,
AgencySimpleOperationType::DELETE_OP);
AgencyOperation delPlanCollections("Plan/Collections/" + name,
AgencySimpleOperationType::DELETE_OP);
AgencyOperation incrementVersion("Plan/Version",
AgencySimpleOperationType::INCREMENT_OP);
AgencyPrecondition databaseExists("Plan/Databases/" + name,
AgencyPrecondition::Type::EMPTY, false);
AgencyWriteTransaction trans(
{delPlanDatabases, delPlanCollections, incrementVersion}, databaseExists);
res = ac.sendTransactionWithFailover(trans);
// Load our own caches:
loadPlan();
// Now wait stuff in Current to disappear and thus be complete:
{
CONDITION_LOCKER(locker, agencyCallback->_cv);
while (true) {
if (*dbServerResult >= 0) {
res = ac.removeValues(where, true);
if (res.successful()) {
return setErrormsg(TRI_ERROR_NO_ERROR, errorMsg);
}
return setErrormsg(
TRI_ERROR_CLUSTER_COULD_NOT_REMOVE_DATABASE_IN_CURRENT, errorMsg);
}
if (TRI_microtime() > endTime) {
AgencyCommResult ag = ac.getValues("/");
if (ag.successful()) {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Agency dump:\n"
<< ag.slice().toJson();
} else {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Could not get agency dump!";
}
return setErrormsg(TRI_ERROR_CLUSTER_TIMEOUT, errorMsg);
}
agencyCallback->executeByCallbackOrTimeout(interval);
}
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief create collection in coordinator, the return value is an ArangoDB
/// error code and the errorMsg is set accordingly. One possible error
/// is a timeout, a timeout of 0.0 means no timeout.
////////////////////////////////////////////////////////////////////////////////
int ClusterInfo::createCollectionCoordinator(std::string const& databaseName,
std::string const& collectionID,
uint64_t numberOfShards,
uint64_t replicationFactor,
bool waitForReplication,
VPackSlice const& json,
std::string& errorMsg,
double timeout) {
using arangodb::velocypack::Slice;
AgencyComm ac;
double const realTimeout = getTimeout(timeout);
double const endTime = TRI_microtime() + realTimeout;
double const interval = getPollInterval();
std::string const name =
arangodb::basics::VelocyPackHelper::getStringValue(json, "name", "");
{
// check if a collection with the same name is already planned
loadPlan();
READ_LOCKER(readLocker, _planProt.lock);
AllCollections::const_iterator it = _plannedCollections.find(databaseName);
if (it != _plannedCollections.end()) {
DatabaseCollections::const_iterator it2 = (*it).second.find(name);
if (it2 != (*it).second.end()) {
// collection already exists!
events::CreateCollection(name, TRI_ERROR_ARANGO_DUPLICATE_NAME);
return TRI_ERROR_ARANGO_DUPLICATE_NAME;
}
}
}
// mop: why do these ask the agency instead of checking cluster info?
if (!ac.exists("Plan/Databases/" + databaseName)) {
events::CreateCollection(name, TRI_ERROR_ARANGO_DATABASE_NOT_FOUND);
return setErrormsg(TRI_ERROR_ARANGO_DATABASE_NOT_FOUND, errorMsg);
}
if (ac.exists("Plan/Collections/" + databaseName + "/" + collectionID)) {
events::CreateCollection(name, TRI_ERROR_CLUSTER_COLLECTION_ID_EXISTS);
return setErrormsg(TRI_ERROR_CLUSTER_COLLECTION_ID_EXISTS, errorMsg);
}
// The following three are used for synchronization between the callback
// closure and the main thread executing this function. Note that it can
// happen that the callback is called only after we return from this
// function!
auto dbServerResult = std::make_shared<int>(-1);
auto errMsg = std::make_shared<std::string>();
auto cacheMutex = std::make_shared<Mutex>();
auto dbServers = getCurrentDBServers();
std::function<bool(VPackSlice const& result)> dbServerChanged =
[=](VPackSlice const& result) {
MUTEX_LOCKER(locker, *cacheMutex);
if (result.isObject() && result.length() == (size_t)numberOfShards) {
std::string tmpError = "";
for (auto const& p : VPackObjectIterator(result)) {
if (arangodb::basics::VelocyPackHelper::getBooleanValue(
p.value, "error", false)) {
tmpError += " shardID:" + p.key.copyString() + ":";
tmpError += arangodb::basics::VelocyPackHelper::getStringValue(
p.value, "errorMessage", "");
if (p.value.hasKey(StaticStrings::ErrorNum)) {
VPackSlice const errorNum = p.value.get(StaticStrings::ErrorNum);
if (errorNum.isNumber()) {
tmpError += " (errNum=";
tmpError += basics::StringUtils::itoa(
errorNum.getNumericValue<uint32_t>());
tmpError += ")";
}
}
}
// wait that all followers have created our new collection
if (tmpError.empty() && waitForReplication) {
std::vector<ServerID> plannedServers;
{
READ_LOCKER(readLocker, _planProt.lock);
auto it = _shardServers.find(p.key.copyString());
if (it != _shardServers.end()) {
plannedServers = (*it).second;
} else {
LOG_TOPIC(DEBUG, Logger::CLUSTER)
<< "Strange, did not find shard in _shardServers: "
<< p.key.copyString();
}
}
if (plannedServers.empty()) {
LOG_TOPIC(DEBUG, Logger::CLUSTER)
<< "This should never have happened, Plan empty. Dumping _shards in Plan:";
for (auto const& p : _shards) {
LOG_TOPIC(DEBUG, Logger::CLUSTER) << "Shard: "
<< p.first;
for (auto const& q : *(p.second)) {
LOG_TOPIC(DEBUG, Logger::CLUSTER) << " Server: " << q;
}
}
TRI_ASSERT(false);
}
std::vector<ServerID> currentServers;
VPackSlice servers = p.value.get("servers");
if (!servers.isArray()) {
return true;
}
for (auto const& server: VPackArrayIterator(servers)) {
if (!server.isString()) {
return true;
}
currentServers.push_back(server.copyString());
}
if (!ClusterHelpers::compareServerLists(plannedServers, currentServers)) {
LOG_TOPIC(DEBUG, Logger::CLUSTER) << "Still waiting for all servers to ACK creation of " << name
<< ". Planned: " << plannedServers << ", Current: " << currentServers;
return true;
}
}
}
if (!tmpError.empty()) {
*errMsg = "Error in creation of collection:" + tmpError + " "
+ __FILE__ + std::to_string(__LINE__);
*dbServerResult = TRI_ERROR_CLUSTER_COULD_NOT_CREATE_COLLECTION;
} else {
*dbServerResult = setErrormsg(TRI_ERROR_NO_ERROR, *errMsg);
}
}
return true;
};
// ATTENTION: The following callback calls the above closure in a
// different thread. Nevertheless, the closure accesses some of our
// local variables. Therefore we have to protect all accesses to them
// by a mutex. We use the mutex of the condition variable in the
// AgencyCallback for this.
auto agencyCallback = std::make_shared<AgencyCallback>(
ac, "Current/Collections/" + databaseName + "/" + collectionID,
dbServerChanged, true, false);
_agencyCallbackRegistry->registerCallback(agencyCallback);
TRI_DEFER(_agencyCallbackRegistry->unregisterCallback(agencyCallback));
std::vector<AgencyOperation> opers (
{ AgencyOperation("Plan/Collections/" + databaseName + "/" + collectionID,
AgencyValueOperationType::SET, json),
AgencyOperation("Plan/Version", AgencySimpleOperationType::INCREMENT_OP)});
std::vector<AgencyPrecondition> precs;
std::shared_ptr<ShardMap> otherCidShardMap = nullptr;
if (json.hasKey("distributeShardsLike")) {
auto const otherCidString = json.get("distributeShardsLike").copyString();
if (!otherCidString.empty()) {
otherCidShardMap = getCollection(databaseName, otherCidString)->shardIds();
// Any of the shards locked?
for (auto const& shard : *otherCidShardMap) {
precs.emplace_back(
AgencyPrecondition("Supervision/Shards/" + shard.first,
AgencyPrecondition::Type::EMPTY, true));
}
}
}
AgencyWriteTransaction transaction(opers,precs);
{ // we hold this mutex from now on until we have updated our cache
// using loadPlan, this is necessary for the callback closure to
// see the new planned state for this collection. Otherwise it cannot
// recognize completion of the create collection operation properly:
MUTEX_LOCKER(locker, *cacheMutex);
auto res = ac.sendTransactionWithFailover(transaction);
// Only if not precondition failed
if (!res.successful()) {
if (res.httpCode() ==
(int)arangodb::rest::ResponseCode::PRECONDITION_FAILED) {
auto result = res.slice();
AgencyCommResult ag = ac.getValues("/");
if (result.isArray() && result.length() > 0) {
if (result[0].isObject()) {
auto tres = result[0];
if (tres.hasKey(
std::vector<std::string>(
{AgencyCommManager::path(), "Supervision"}))) {
for (const auto& s :
VPackObjectIterator(
tres.get(
std::vector<std::string>(
{AgencyCommManager::path(), "Supervision","Shards"})))) {
errorMsg += std::string("Shard ") + s.key.copyString();
errorMsg += " of prototype collection is blocked by supervision job ";
errorMsg += s.value.copyString();
}
}
return TRI_ERROR_CLUSTER_COULD_NOT_CREATE_COLLECTION_IN_PLAN;
}
}
if (ag.successful()) {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Agency dump:\n"
<< ag.slice().toJson();
} else {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Could not get agency dump!";
}
} else {
errorMsg += std::string("file: ") + __FILE__ +
" line: " + std::to_string(__LINE__);
errorMsg += " HTTP code: " + std::to_string(res.httpCode());
errorMsg += " error message: " + res.errorMessage();
errorMsg += " error details: " + res.errorDetails();
errorMsg += " body: " + res.body();
events::CreateCollection(
name, TRI_ERROR_CLUSTER_COULD_NOT_CREATE_COLLECTION_IN_PLAN);
return TRI_ERROR_CLUSTER_COULD_NOT_CREATE_COLLECTION_IN_PLAN;
}
}
// Update our cache:
loadPlan();
}
bool isSmart = false;
VPackSlice smartSlice = json.get("isSmart");
if (smartSlice.isBool() && smartSlice.getBool()) {
isSmart = true;
}
if (numberOfShards == 0 || isSmart) {
loadCurrent();
events::CreateCollection(name, TRI_ERROR_NO_ERROR);
return TRI_ERROR_NO_ERROR;
}
{
CONDITION_LOCKER(locker, agencyCallback->_cv);
while (true) {
errorMsg = *errMsg;
if (*dbServerResult >= 0) {
loadCurrent();
events::CreateCollection(name, *dbServerResult);
return *dbServerResult;
}
if (TRI_microtime() > endTime) {
LOG_TOPIC(ERR, Logger::CLUSTER)
<< "Timeout in _create collection"
<< ": database: " << databaseName << ", collId:" << collectionID
<< "\njson: " << json.toString()
<< "\ntransaction sent to agency: " << transaction.toJson();
AgencyCommResult ag = ac.getValues("");
if (ag.successful()) {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Agency dump:\n"
<< ag.slice().toJson();
} else {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Could not get agency dump!";
}
// Now we ought to remove the collection again in the Plan:
AgencyOperation removeCollection(
"Plan/Collections/" + databaseName + "/" + collectionID,
AgencySimpleOperationType::DELETE_OP);
AgencyOperation increaseVersion("Plan/Version",
AgencySimpleOperationType::INCREMENT_OP);
AgencyWriteTransaction transaction;
transaction.operations.push_back(removeCollection);
transaction.operations.push_back(increaseVersion);
// This is a best effort, in the worst case the collection stays:
ac.sendTransactionWithFailover(transaction);
events::CreateCollection(name, TRI_ERROR_CLUSTER_TIMEOUT);
return setErrormsg(TRI_ERROR_CLUSTER_TIMEOUT, errorMsg);
}
agencyCallback->executeByCallbackOrTimeout(interval);
}
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief drop collection in coordinator, the return value is an ArangoDB
/// error code and the errorMsg is set accordingly. One possible error
/// is a timeout, a timeout of 0.0 means no timeout.
////////////////////////////////////////////////////////////////////////////////
int ClusterInfo::dropCollectionCoordinator(
std::string const& databaseName, std::string const& collectionID,
std::string& errorMsg, double timeout) {
AgencyComm ac;
AgencyCommResult res;
// First check that no other collection has a distributeShardsLike
// entry pointing to us:
auto coll = getCollection(databaseName, collectionID);
auto colls = getCollections(databaseName);
std::vector<std::string> clones;
for (std::shared_ptr<LogicalCollection> const& p : colls) {
if (p->distributeShardsLike() == coll->name() ||
p->distributeShardsLike() == collectionID) {
clones.push_back(p->name());
}
}
if (!clones.empty()){
errorMsg += "Collection must not be dropped while it is a sharding "
"prototype for collection(s)";
for (auto const& i : clones) {
errorMsg += std::string(" ") + i;
}
errorMsg += ".";
return TRI_ERROR_CLUSTER_MUST_NOT_DROP_COLL_OTHER_DISTRIBUTESHARDSLIKE;
}
double const realTimeout = getTimeout(timeout);
double const endTime = TRI_microtime() + realTimeout;
double const interval = getPollInterval();
auto dbServerResult = std::make_shared<int>(-1);
auto errMsg = std::make_shared<std::string>();
std::function<bool(VPackSlice const& result)> dbServerChanged =
[=](VPackSlice const& result) {
if (result.isObject() && result.length() == 0) {
*dbServerResult = setErrormsg(TRI_ERROR_NO_ERROR, *errMsg);
}
return true;
};
// monitor the entry for the collection
std::string const where =
"Current/Collections/" + databaseName + "/" + collectionID;
// ATTENTION: The following callback calls the above closure in a
// different thread. Nevertheless, the closure accesses some of our
// local variables. Therefore we have to protect all accesses to them
// by a mutex. We use the mutex of the condition variable in the
// AgencyCallback for this.
auto agencyCallback =
std::make_shared<AgencyCallback>(ac, where, dbServerChanged, true, false);
_agencyCallbackRegistry->registerCallback(agencyCallback);
TRI_DEFER(_agencyCallbackRegistry->unregisterCallback(agencyCallback));
size_t numberOfShards = 0;
res = ac.getValues("Plan/Collections/" + databaseName + "/" + collectionID +
"/shards");
if (res.successful()) {
velocypack::Slice shards = res.slice()[0].get(std::vector<std::string>(
{AgencyCommManager::path(), "Plan", "Collections", databaseName,
collectionID, "shards"}));
if (shards.isObject()) {
numberOfShards = shards.length();
} else {
LOG_TOPIC(ERR, Logger::CLUSTER)
<< "Missing shards information on dropping" << databaseName << "/"
<< collectionID;
}
}
// Transact to agency
AgencyOperation delPlanCollection(
"Plan/Collections/" + databaseName + "/" + collectionID,
AgencySimpleOperationType::DELETE_OP);
AgencyOperation incrementVersion("Plan/Version",
AgencySimpleOperationType::INCREMENT_OP);
AgencyPrecondition precondition = AgencyPrecondition(
"Plan/Databases/" + databaseName, AgencyPrecondition::Type::EMPTY, false);
AgencyWriteTransaction trans({delPlanCollection, incrementVersion},
precondition);
res = ac.sendTransactionWithFailover(trans);
if (!res.successful()) {
AgencyCommResult ag = ac.getValues("");
if (ag.successful()) {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Agency dump:\n"
<< ag.slice().toJson();
} else {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Could not get agency dump!";
}
}
// Update our own cache:
loadPlan();
if (numberOfShards == 0) {
loadCurrent();
events::DropCollection(collectionID, TRI_ERROR_NO_ERROR);
return TRI_ERROR_NO_ERROR;
}
{
CONDITION_LOCKER(locker, agencyCallback->_cv);
while (true) {
errorMsg = *errMsg;
if (*dbServerResult >= 0) {
// ...remove the entire directory for the collection
ac.removeValues(
"Current/Collections/" + databaseName + "/" + collectionID, true);
loadCurrent();
events::DropCollection(collectionID, *dbServerResult);
return *dbServerResult;
}
if (TRI_microtime() > endTime) {
LOG_TOPIC(ERR, Logger::CLUSTER)
<< "Timeout in _drop collection (" << realTimeout << ")"
<< ": database: " << databaseName << ", collId:" << collectionID
<< "\ntransaction sent to agency: " << trans.toJson();
AgencyCommResult ag = ac.getValues("");
if (ag.successful()) {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Agency dump:\n"
<< ag.slice().toJson();
} else {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Could not get agency dump!";
}
events::DropCollection(collectionID, TRI_ERROR_CLUSTER_TIMEOUT);
return setErrormsg(TRI_ERROR_CLUSTER_TIMEOUT, errorMsg);
}
agencyCallback->executeByCallbackOrTimeout(interval);
}
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief set collection properties in coordinator
////////////////////////////////////////////////////////////////////////////////
Result ClusterInfo::setCollectionPropertiesCoordinator(
std::string const& databaseName, std::string const& collectionID,
LogicalCollection const* info) {
AgencyComm ac;
AgencyCommResult res;
AgencyPrecondition databaseExists("Plan/Databases/" + databaseName,
AgencyPrecondition::Type::EMPTY, false);
AgencyOperation incrementVersion("Plan/Version",
AgencySimpleOperationType::INCREMENT_OP);
res = ac.getValues("Plan/Collections/" + databaseName + "/" + collectionID);
if (!res.successful()) {
return Result(TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND);
}
velocypack::Slice collection = res.slice()[0].get(
std::vector<std::string>({AgencyCommManager::path(), "Plan",
"Collections", databaseName, collectionID}));
if (!collection.isObject()) {
return Result(TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND);
}
VPackBuilder temp;
temp.openObject();
temp.add("waitForSync", VPackValue(info->waitForSync()));
temp.add("replicationFactor", VPackValue(info->replicationFactor()));
info->getPhysical()->getPropertiesVPackCoordinator(temp);
temp.close();
VPackBuilder builder = VPackCollection::merge(collection, temp.slice(), true);
res.clear();
AgencyOperation setColl(
"Plan/Collections/" + databaseName + "/" + collectionID,
AgencyValueOperationType::SET, builder.slice());
AgencyWriteTransaction trans({setColl, incrementVersion}, databaseExists);
res = ac.sendTransactionWithFailover(trans);
if (res.successful()) {
loadPlan();
return Result();
}
return Result(TRI_ERROR_CLUSTER_AGENCY_COMMUNICATION_FAILED, res.errorMessage());
}
////////////////////////////////////////////////////////////////////////////////
/// @brief create view in coordinator, the return value is an ArangoDB
/// error code and the errorMsg is set accordingly. One possible error
/// is a timeout, a timeout of 0.0 means no timeout.
////////////////////////////////////////////////////////////////////////////////
int ClusterInfo::createViewCoordinator(std::string const& databaseName,
std::string const& viewID,
VPackSlice const& json,
std::string& errorMsg) {
using arangodb::velocypack::Slice;
AgencyComm ac;
std::string const name =
arangodb::basics::VelocyPackHelper::getStringValue(json, "name", "");
{
// check if a view with the same name is already planned
loadPlan();
READ_LOCKER(readLocker, _planProt.lock);
AllViews::const_iterator it = _plannedViews.find(databaseName);
if (it != _plannedViews.end()) {
DatabaseViews::const_iterator it2 = (*it).second.find(name);
if (it2 != (*it).second.end()) {
// view already exists!
events::CreateView(name, TRI_ERROR_ARANGO_DUPLICATE_NAME);
return TRI_ERROR_ARANGO_DUPLICATE_NAME;
}
}
}
// mop: why do these ask the agency instead of checking cluster info?
if (!ac.exists("Plan/Databases/" + databaseName)) {
events::CreateView(name, TRI_ERROR_ARANGO_DATABASE_NOT_FOUND);
return setErrormsg(TRI_ERROR_ARANGO_DATABASE_NOT_FOUND, errorMsg);
}
if (ac.exists("Plan/Views/" + databaseName + "/" + viewID)) {
events::CreateView(name, TRI_ERROR_CLUSTER_COLLECTION_ID_EXISTS);
return setErrormsg(TRI_ERROR_CLUSTER_COLLECTION_ID_EXISTS, errorMsg);
}
std::vector<AgencyOperation> opers (
{ AgencyOperation("Plan/Views/" + databaseName + "/" + viewID,
AgencyValueOperationType::SET, json),
AgencyOperation("Plan/Version", AgencySimpleOperationType::INCREMENT_OP)});
std::vector<AgencyPrecondition> precs;
precs.emplace_back(
AgencyPrecondition("Plan/Views/" + databaseName + "/" + viewID,
AgencyPrecondition::Type::EMPTY, true));
AgencyWriteTransaction transaction(opers, precs);
auto res = ac.sendTransactionWithFailover(transaction);
// Only if not precondition failed
if (!res.successful()) {
if (res.httpCode() ==
(int)arangodb::rest::ResponseCode::PRECONDITION_FAILED) {
errorMsg += std::string("Precondition that view ") + name + " with ID "
+ viewID + " does not yet exist failed. Cannot create view.";
// Dump agency plan:
AgencyCommResult ag = ac.getValues("/");
if (ag.successful()) {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Agency dump:\n"
<< ag.slice().toJson();
} else {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Could not get agency dump!";
}
return TRI_ERROR_CLUSTER_COULD_NOT_CREATE_VIEW_IN_PLAN;
} else {
errorMsg += std::string("file: ") + __FILE__ +
" line: " + std::to_string(__LINE__);
errorMsg += " HTTP code: " + std::to_string(res.httpCode());
errorMsg += " error message: " + res.errorMessage();
errorMsg += " error details: " + res.errorDetails();
errorMsg += " body: " + res.body();
events::CreateCollection(
name, TRI_ERROR_CLUSTER_COULD_NOT_CREATE_COLLECTION_IN_PLAN);
return TRI_ERROR_CLUSTER_COULD_NOT_CREATE_COLLECTION_IN_PLAN;
}
}
// Update our cache:
loadPlan();
return TRI_ERROR_NO_ERROR;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief drop view in coordinator, the return value is an ArangoDB
/// error code and the errorMsg is set accordingly.
////////////////////////////////////////////////////////////////////////////////
int ClusterInfo::dropViewCoordinator(
std::string const& databaseName, std::string const& viewID,
std::string& errorMsg) {
AgencyComm ac;
AgencyCommResult res;
// Transact to agency
AgencyOperation delPlanCollection(
"Plan/Views/" + databaseName + "/" + viewID,
AgencySimpleOperationType::DELETE_OP);
AgencyOperation incrementVersion("Plan/Version",
AgencySimpleOperationType::INCREMENT_OP);
AgencyPrecondition precondition = AgencyPrecondition(
"Plan/Databases/" + databaseName, AgencyPrecondition::Type::EMPTY, false);
AgencyPrecondition pre2 = AgencyPrecondition(
"Plan/Views/" + databaseName + "/" + viewID,
AgencyPrecondition::Type::EMPTY, false);
AgencyWriteTransaction trans({delPlanCollection, incrementVersion},
{precondition, pre2});
res = ac.sendTransactionWithFailover(trans);
if (!res.successful()) {
AgencyCommResult ag = ac.getValues("");
if (ag.successful()) {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Agency dump:\n"
<< ag.slice().toJson();
} else {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Could not get agency dump!";
}
}
// Update our own cache:
loadPlan();
events::DropView(viewID, TRI_ERROR_NO_ERROR);
return TRI_ERROR_NO_ERROR;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief set collection status in coordinator
////////////////////////////////////////////////////////////////////////////////
Result ClusterInfo::setCollectionStatusCoordinator(
std::string const& databaseName, std::string const& collectionID,
TRI_vocbase_col_status_e status) {
AgencyComm ac;
AgencyCommResult res;
AgencyPrecondition databaseExists("Plan/Databases/" + databaseName,
AgencyPrecondition::Type::EMPTY, false);
res = ac.getValues("Plan/Collections/" + databaseName + "/" + collectionID);
if (!res.successful()) {
return Result(TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND);
}
VPackSlice col = res.slice()[0].get(
std::vector<std::string>({AgencyCommManager::path(), "Plan",
"Collections", databaseName, collectionID}));
if (!col.isObject()) {
return Result(TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND);
}
TRI_vocbase_col_status_e old = static_cast<TRI_vocbase_col_status_e>(
arangodb::basics::VelocyPackHelper::getNumericValue<int>(
col, "status", static_cast<int>(TRI_VOC_COL_STATUS_CORRUPTED)));
if (old == status) {
// no status change
return Result();
}
VPackBuilder builder;
try {
VPackObjectBuilder b(&builder);
for (auto const& entry : VPackObjectIterator(col)) {
std::string key = entry.key.copyString();
if (key != "status") {
builder.add(key, entry.value);
}
}
builder.add("status", VPackValue(status));
} catch (...) {
return Result(TRI_ERROR_OUT_OF_MEMORY);
}
res.clear();
AgencyOperation setColl(
"Plan/Collections/" + databaseName + "/" + collectionID,
AgencyValueOperationType::SET, builder.slice());
AgencyWriteTransaction trans(setColl, databaseExists);
res = ac.sendTransactionWithFailover(trans);
if (res.successful()) {
loadPlan();
return Result();
}
return Result(TRI_ERROR_CLUSTER_AGENCY_COMMUNICATION_FAILED, res.errorMessage());
}
////////////////////////////////////////////////////////////////////////////////
/// @brief ensure an index in coordinator.
////////////////////////////////////////////////////////////////////////////////
int ClusterInfo::ensureIndexCoordinator(
std::string const& databaseName, std::string const& collectionID,
VPackSlice const& slice, bool create,
bool (*compare)(VPackSlice const&, VPackSlice const&),
VPackBuilder& resultBuilder, std::string& errorMsg, double timeout) {
// check index id
uint64_t iid = 0;
VPackSlice const idSlice = slice.get("id");
if (idSlice.isString()) {
// use predefined index id
iid = arangodb::basics::StringUtils::uint64(idSlice.copyString());
}
if (iid == 0) {
// no id set, create a new one!
iid = uniqid();
}
std::string const idString = arangodb::basics::StringUtils::itoa(iid);
int errorCode;
try {
errorCode = ensureIndexCoordinatorWithoutRollback(
databaseName, collectionID, idString, slice, create, compare, resultBuilder, errorMsg, timeout);
} catch (basics::Exception const& ex) {
errorCode = ex.code();
} catch (...) {
errorCode = TRI_ERROR_INTERNAL;
}
if (errorCode == TRI_ERROR_NO_ERROR || application_features::ApplicationServer::isStopping()) {
return errorCode;
}
std::shared_ptr<VPackBuilder> planValue;
std::shared_ptr<VPackBuilder> oldPlanIndexes;
std::shared_ptr<LogicalCollection> c;
size_t tries = 0;
do {
loadPlan();
// find index in plan
planValue = nullptr;
oldPlanIndexes.reset(new VPackBuilder());
c = getCollection(databaseName, collectionID);
c->getIndexesVPack(*(oldPlanIndexes.get()), false, false);
VPackSlice const planIndexes = oldPlanIndexes->slice();
if (planIndexes.isArray()) {
for (auto const& index : VPackArrayIterator(planIndexes)) {
auto idPlanSlice = index.get("id");
if (idPlanSlice.isString() && idPlanSlice.copyString() == idString) {
planValue.reset(new VPackBuilder());
planValue->add(index);
break;
}
}
}
if (planValue==nullptr) {
// hmm :S both empty :S did somebody else clean up? :S
// should not happen?
return errorCode;
}
std::string const planIndexesKey = "Plan/Collections/" + databaseName + "/" + collectionID +"/indexes";
std::vector<AgencyOperation> operations;
std::vector<AgencyPrecondition> preconditions;
if (planValue) {
AgencyOperation planEraser(planIndexesKey, AgencyValueOperationType::ERASE, planValue->slice());
TRI_ASSERT(oldPlanIndexes);
AgencyPrecondition planPrecondition(planIndexesKey, AgencyPrecondition::Type::VALUE, oldPlanIndexes->slice());
operations.push_back(planEraser);
operations.push_back(AgencyOperation("Plan/Version", AgencySimpleOperationType::INCREMENT_OP));
preconditions.push_back(planPrecondition);
}
AgencyWriteTransaction trx(operations, preconditions);
AgencyCommResult eraseResult = _agency.sendTransactionWithFailover(trx, 0.0);
if (eraseResult.successful()) {
loadPlan();
return errorCode;
}
std::chrono::duration<size_t, std::milli> waitTime(10);
std::this_thread::sleep_for(waitTime);
} while (++tries < 5);
LOG_TOPIC(ERR, Logger::CLUSTER) << "Couldn't roll back index creation of " << idString << ". Database: " << databaseName << ", Collection " << collectionID;
return errorCode;
}
int ClusterInfo::ensureIndexCoordinatorWithoutRollback(
std::string const& databaseName, std::string const& collectionID,
std::string const& idString, VPackSlice const& slice, bool create,
bool (*compare)(VPackSlice const&, VPackSlice const&),
VPackBuilder& resultBuilder, std::string& errorMsg, double timeout) {
AgencyComm ac;
double const realTimeout = getTimeout(timeout);
double const endTime = TRI_microtime() + realTimeout;
double const interval = getPollInterval();
TRI_ASSERT(resultBuilder.isEmpty());
std::string const key =
"Plan/Collections/" + databaseName + "/" + collectionID;
AgencyCommResult previous = ac.getValues(key);
if (!previous.successful()) {
return TRI_ERROR_CLUSTER_READING_PLAN_AGENCY;
}
velocypack::Slice collection = previous.slice()[0].get(
std::vector<std::string>({AgencyCommManager::path(), "Plan",
"Collections", databaseName, collectionID}));
if (!collection.isObject()) {
return setErrormsg(TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND, errorMsg);
}
loadPlan();
// It is possible that between the fetching of the planned collections
// and the write lock we acquire below something has changed. Therefore
// we first get the previous value and then do a compare and swap operation.
auto numberOfShardsMutex = std::make_shared<Mutex>();
auto numberOfShards = std::make_shared<int>(0);
auto resBuilder = std::make_shared<VPackBuilder>();
VPackBuilder collectionBuilder;
{
std::shared_ptr<LogicalCollection> c =
getCollection(databaseName, collectionID);
std::shared_ptr<VPackBuilder> tmp = std::make_shared<VPackBuilder>();
c->getIndexesVPack(*(tmp.get()), false, false);
{
MUTEX_LOCKER(guard, *numberOfShardsMutex);
*numberOfShards = c->numberOfShards();
}
VPackSlice const indexes = tmp->slice();
if (indexes.isArray()) {
VPackSlice const type = slice.get("type");
if (!type.isString()) {
return setErrormsg(TRI_ERROR_INTERNAL, errorMsg);
}
for (auto const& other : VPackArrayIterator(indexes)) {
if (arangodb::basics::VelocyPackHelper::compare(type, other.get("type"),
false) != 0) {
// compare index types first. they must match
continue;
}
TRI_ASSERT(other.isObject());
bool isSame = compare(slice, other);
if (isSame) {
// found an existing index...
{
// Copy over all elements in slice.
VPackObjectBuilder b(resBuilder.get());
for (auto const& entry : VPackObjectIterator(other)) {
resBuilder->add(entry.key.copyString(), entry.value);
}
resBuilder->add("isNewlyCreated", VPackValue(false));
}
resultBuilder = *resBuilder;
return setErrormsg(TRI_ERROR_NO_ERROR, errorMsg);
}
}
}
// no existing index found.
if (!create) {
TRI_ASSERT(resultBuilder.isEmpty());
return setErrormsg(TRI_ERROR_NO_ERROR, errorMsg);
}
// now create a new index
std::unordered_set<std::string> const ignoreKeys{
"allowUserKeys", "cid", /* cid really ignore?*/
"count", "globallyUniqueId", "planId", "version", "objectId"
};
c->setStatus(TRI_VOC_COL_STATUS_LOADED);
collectionBuilder = c->toVelocyPackIgnore(ignoreKeys, false, false);
}
VPackSlice const collectionSlice = collectionBuilder.slice();
auto newBuilder = std::make_shared<VPackBuilder>();
if (!collectionSlice.isObject()) {
return setErrormsg(TRI_ERROR_CLUSTER_AGENCY_STRUCTURE_INVALID, errorMsg);
}
try {
VPackObjectBuilder b(newBuilder.get());
// Create a new collection VPack with the new Index
for (auto const& entry : VPackObjectIterator(collectionSlice)) {
TRI_ASSERT(entry.key.isString());
std::string key = entry.key.copyString();
if (key == "indexes") {
TRI_ASSERT(entry.value.isArray());
newBuilder->add(key, VPackValue(VPackValueType::Array));
// Copy over all indexes known so far
for (auto const& idx : VPackArrayIterator(entry.value)) {
newBuilder->add(idx);
}
{
VPackObjectBuilder ob(newBuilder.get());
// Add the new index ignoring "id"
for (auto const& e : VPackObjectIterator(slice)) {
TRI_ASSERT(e.key.isString());
std::string tmpkey = e.key.copyString();
if (tmpkey != "id") {
newBuilder->add(tmpkey, e.value);
}
}
newBuilder->add("id", VPackValue(idString));
}
newBuilder->close(); // the array
} else {
// Plain copy everything else
newBuilder->add(key, entry.value);
}
}
} catch (...) {
return setErrormsg(TRI_ERROR_OUT_OF_MEMORY, errorMsg);
}
std::shared_ptr<int> dbServerResult = std::make_shared<int>(-1);
std::shared_ptr<std::string> errMsg = std::make_shared<std::string>();
std::function<bool(VPackSlice const& result)> dbServerChanged = [=](
VPackSlice const& result) {
MUTEX_LOCKER(guard, *numberOfShardsMutex);
// mop: uhhhh....we didn't even set the plan yet :O
if (*numberOfShards == 0) {
return false;
}
if (!result.isObject()) {
return true;
}
if (result.length() == (size_t)*numberOfShards) {
size_t found = 0;
for (auto const& shard : VPackObjectIterator(result)) {
VPackSlice const slice = shard.value;
if (slice.hasKey("indexes")) {
VPackSlice const indexes = slice.get("indexes");
if (!indexes.isArray()) {
// no list, so our index is not present. we can abort searching
break;
}
for (auto const& v : VPackArrayIterator(indexes)) {
// check for errors
if (hasError(v)) {
std::string errorMsg =
extractErrorMessage(shard.key.copyString(), v);
errorMsg = "Error during index creation: " + errorMsg;
// Returns the specific error number if set, or the general
// error
// otherwise
*dbServerResult =
arangodb::basics::VelocyPackHelper::getNumericValue<int>(
v, "errorNum", TRI_ERROR_ARANGO_INDEX_CREATION_FAILED);
return true;
}
VPackSlice const k = v.get("id");
if (!k.isString() || idString != k.copyString()) {
// this is not our index
continue;
}
// found our index
found++;
break;
}
}
}
if (found == (size_t)*numberOfShards) {
VPackSlice indexFinder = newBuilder->slice();
TRI_ASSERT(indexFinder.isObject());
indexFinder = indexFinder.get("indexes");
TRI_ASSERT(indexFinder.isArray());
VPackValueLength l = indexFinder.length();
indexFinder = indexFinder.at(l - 1); // Get the last index
TRI_ASSERT(indexFinder.isObject());
{
// Copy over all elements in slice.
VPackObjectBuilder b(resBuilder.get());
for (auto const& entry : VPackObjectIterator(indexFinder)) {
resBuilder->add(entry.key.copyString(), entry.value);
}
resBuilder->add("isNewlyCreated", VPackValue(true));
}
*dbServerResult = setErrormsg(TRI_ERROR_NO_ERROR, *errMsg);
return true;
}
}
return true;
};
// ATTENTION: The following callback calls the above closure in a
// different thread. Nevertheless, the closure accesses some of our
// local variables. Therefore we have to protect all accesses to them
// by a mutex. We use the mutex of the condition variable in the
// AgencyCallback for this.
std::string where =
"Current/Collections/" + databaseName + "/" + collectionID;
auto agencyCallback =
std::make_shared<AgencyCallback>(ac, where, dbServerChanged, true, false);
_agencyCallbackRegistry->registerCallback(agencyCallback);
TRI_DEFER(_agencyCallbackRegistry->unregisterCallback(agencyCallback));
AgencyOperation newValue(key, AgencyValueOperationType::SET,
newBuilder->slice());
AgencyOperation incrementVersion("Plan/Version",
AgencySimpleOperationType::INCREMENT_OP);
AgencyPrecondition oldValue(key, AgencyPrecondition::Type::VALUE, collection);
AgencyWriteTransaction trx({newValue, incrementVersion}, oldValue);
AgencyCommResult result = ac.sendTransactionWithFailover(trx, 0.0);
if (!result.successful()) {
if (result.httpCode() ==
(int)arangodb::rest::ResponseCode::PRECONDITION_FAILED) {
AgencyCommResult ag = ac.getValues("/");
if (ag.successful()) {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Agency dump:\n"
<< ag.slice().toJson();
} else {
LOG_TOPIC(ERR, Logger::CLUSTER) << "Could not get agency dump!";
}
} else {
errorMsg += " Failed to execute ";
errorMsg += trx.toJson();
errorMsg += " ResultCode: " + std::to_string(result.errorCode()) + " ";
errorMsg += " HttpCode: " + std::to_string(result.httpCode()) + " ";
errorMsg += std::string(__FILE__) + ":" + std::to_string(__LINE__);
resultBuilder = *resBuilder;
}
return TRI_ERROR_CLUSTER_COULD_NOT_CREATE_INDEX_IN_PLAN;
}
loadPlan();
{
MUTEX_LOCKER(guard, *numberOfShardsMutex);
if (*numberOfShards == 0) {
errorMsg = *errMsg;
resultBuilder = *resBuilder;
loadCurrent();
return TRI_ERROR_NO_ERROR;
}
}
{
CONDITION_LOCKER(locker, agencyCallback->_cv);
while (true) {
errorMsg = *errMsg;
resultBuilder = *resBuilder;
if (*dbServerResult >= 0) {
loadCurrent();
return *dbServerResult;
}
if (TRI_microtime() > endTime) {
return setErrormsg(TRI_ERROR_CLUSTER_TIMEOUT, errorMsg);
}
agencyCallback->executeByCallbackOrTimeout(interval);
}
}
return setErrormsg(TRI_ERROR_CLUSTER_TIMEOUT, errorMsg);
}
////////////////////////////////////////////////////////////////////////////////
/// @brief drop an index in coordinator.
////////////////////////////////////////////////////////////////////////////////
int ClusterInfo::dropIndexCoordinator(std::string const& databaseName,
std::string const& collectionID,
TRI_idx_iid_t iid, std::string& errorMsg,
double timeout) {
AgencyComm ac;
double const realTimeout = getTimeout(timeout);
double const endTime = TRI_microtime() + realTimeout;
double const interval = getPollInterval();
auto numberOfShardsMutex = std::make_shared<Mutex>();
auto numberOfShards = std::make_shared<int>(0);
std::string const idString = arangodb::basics::StringUtils::itoa(iid);
std::string const key =
"Plan/Collections/" + databaseName + "/" + collectionID;
AgencyCommResult res = ac.getValues(key);
if (!res.successful()) {
events::DropIndex(collectionID, idString,
TRI_ERROR_CLUSTER_READING_PLAN_AGENCY);
return TRI_ERROR_CLUSTER_READING_PLAN_AGENCY;
}
velocypack::Slice previous = res.slice()[0].get(
std::vector<std::string>({AgencyCommManager::path(), "Plan",
"Collections", databaseName, collectionID}));
if (!previous.isObject()) {
events::DropIndex(collectionID, idString,
TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND);
return TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND;
}
TRI_ASSERT(VPackObjectIterator(previous).size() > 0);
std::string where =
"Current/Collections/" + databaseName + "/" + collectionID;
auto dbServerResult = std::make_shared<int>(-1);
auto errMsg = std::make_shared<std::string>();
std::function<bool(VPackSlice const& result)> dbServerChanged =
[=](VPackSlice const& current) {
MUTEX_LOCKER(guard, *numberOfShardsMutex);
if (*numberOfShards == 0) {
return false;
}
if (!current.isObject()) {
return true;
}
VPackObjectIterator shards(current);
if (shards.size() == (size_t)(*numberOfShards)) {
bool found = false;
for (auto const& shard : shards) {
VPackSlice const indexes = shard.value.get("indexes");
if (indexes.isArray()) {
for (auto const& v : VPackArrayIterator(indexes)) {
if (v.isObject()) {
VPackSlice const k = v.get("id");
if (k.isString() && idString == k.copyString()) {
// still found the index in some shard
found = true;
break;
}
}
if (found) {
break;
}
}
}
}
if (!found) {
*dbServerResult = setErrormsg(TRI_ERROR_NO_ERROR, *errMsg);
}
}
return true;
};
// ATTENTION: The following callback calls the above closure in a
// different thread. Nevertheless, the closure accesses some of our
// local variables. Therefore we have to protect all accesses to them
// by a mutex. We use the mutex of the condition variable in the
// AgencyCallback for this.
auto agencyCallback =
std::make_shared<AgencyCallback>(ac, where, dbServerChanged, true, false);
_agencyCallbackRegistry->registerCallback(agencyCallback);
TRI_DEFER(_agencyCallbackRegistry->unregisterCallback(agencyCallback));
loadPlan();
// It is possible that between the fetching of the planned collections
// and the write lock we acquire below something has changed. Therefore
// we first get the previous value and then do a compare and swap operation.
VPackBuilder tmp;
VPackSlice indexes;
{
std::shared_ptr<LogicalCollection> c =
getCollection(databaseName, collectionID);
READ_LOCKER(readLocker, _planProt.lock);
c->getIndexesVPack(tmp, false, false);
indexes = tmp.slice();
if (!indexes.isArray()) {
try {
LOG_TOPIC(DEBUG, Logger::CLUSTER)
<< "Failed to find index " << databaseName << "/" << collectionID
<< "/" << iid << " - " << indexes.toJson();
} catch (std::exception const& e) {
LOG_TOPIC(DEBUG, Logger::CLUSTER)
<< "Failed to find index " << databaseName << "/" << collectionID
<< "/" << iid << " - " << e.what();
}
// no indexes present, so we can't delete our index
return setErrormsg(TRI_ERROR_ARANGO_INDEX_NOT_FOUND, errorMsg);
}
MUTEX_LOCKER(guard, *numberOfShardsMutex);
*numberOfShards = c->numberOfShards();
}
bool found = false;
VPackBuilder newIndexes;
{
VPackArrayBuilder newIndexesArrayBuilder(&newIndexes);
// mop: eh....do we need a flag to mark it invalid until cache is renewed?
for (auto const& indexSlice : VPackArrayIterator(indexes)) {
VPackSlice id = indexSlice.get("id");
VPackSlice type = indexSlice.get("type");
if (!id.isString() || !type.isString()) {
continue;
}
if (idString == id.copyString()) {
// found our index, ignore it when copying
found = true;
std::string const typeString = type.copyString();
if (typeString == "primary" || typeString == "edge") {
return setErrormsg(TRI_ERROR_FORBIDDEN, errorMsg);
}
continue;
}
newIndexes.add(indexSlice);
}
}
if (!found) {
try {
// it is not necessarily an error that the index is not found,
// for example if one tries to drop a non-existing index. so we
// do not log any warnings but just in debug mode
LOG_TOPIC(DEBUG, Logger::CLUSTER)
<< "Failed to find index " << databaseName << "/" << collectionID
<< "/" << iid << " - " << indexes.toJson();
} catch (std::exception const& e) {
LOG_TOPIC(DEBUG, Logger::CLUSTER)
<< "Failed to find index " << databaseName << "/" << collectionID
<< "/" << iid << " - " << e.what();
}
return setErrormsg(TRI_ERROR_ARANGO_INDEX_NOT_FOUND, errorMsg);
}
VPackBuilder newCollectionBuilder;
{
VPackObjectBuilder newCollectionObjectBuilder(&newCollectionBuilder);
for (auto const& property : VPackObjectIterator(previous)) {
if (property.key.copyString() == "indexes") {
newCollectionBuilder.add(property.key.copyString(), newIndexes.slice());
} else {
newCollectionBuilder.add(property.key.copyString(), property.value);
}
}
}
AgencyOperation newVal(key, AgencyValueOperationType::SET,
newCollectionBuilder.slice());
AgencyOperation incrementVersion("Plan/Version",
AgencySimpleOperationType::INCREMENT_OP);
AgencyPrecondition prec(key, AgencyPrecondition::Type::VALUE, previous);
AgencyWriteTransaction trx({newVal, incrementVersion}, prec);
AgencyCommResult result = ac.sendTransactionWithFailover(trx, 0.0);
if (!result.successful()) {
errorMsg += " Failed to execute ";
errorMsg += trx.toJson();
errorMsg += " ResultCode: " + std::to_string(result.errorCode()) + " ";
events::DropIndex(collectionID, idString,
TRI_ERROR_CLUSTER_COULD_NOT_DROP_INDEX_IN_PLAN);
return TRI_ERROR_CLUSTER_COULD_NOT_DROP_INDEX_IN_PLAN;
}
// load our own cache:
loadPlan();
{
MUTEX_LOCKER(guard, *numberOfShardsMutex);
if (*numberOfShards == 0) {
loadCurrent();
return TRI_ERROR_NO_ERROR;
}
}
{
CONDITION_LOCKER(locker, agencyCallback->_cv);
while (true) {
errorMsg = *errMsg;
if (*dbServerResult >= 0) {
loadCurrent();
events::DropIndex(collectionID, idString, *dbServerResult);
return *dbServerResult;
}
if (TRI_microtime() > endTime) {
events::DropIndex(collectionID, idString, TRI_ERROR_CLUSTER_TIMEOUT);
return setErrormsg(TRI_ERROR_CLUSTER_TIMEOUT, errorMsg);
}
agencyCallback->executeByCallbackOrTimeout(interval);
}
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief (re-)load the information about servers from the agency
/// Usually one does not have to call this directly.
////////////////////////////////////////////////////////////////////////////////
static std::string const prefixServers = "Current/ServersRegistered";
static std::string const mapUniqueToShortId = "Target/MapUniqueToShortID";
void ClusterInfo::loadServers() {
++_serversProt.wantedVersion; // Indicate that after *NOW* somebody has to
// reread from the agency!
MUTEX_LOCKER(mutexLocker, _serversProt.mutex);
uint64_t storedVersion = _serversProt.wantedVersion; // this is the version
// we will set in the end
if (_serversProt.doneVersion == storedVersion) {
// Somebody else did, what we intended to do, so just return
return;
}
AgencyCommResult result = _agency.sendTransactionWithFailover(
AgencyReadTransaction(std::vector<std::string>({AgencyCommManager::path(prefixServers),
AgencyCommManager::path(mapUniqueToShortId)})));
if (result.successful()) {
velocypack::Slice serversRegistered =
result.slice()[0].get(
std::vector<std::string>(
{AgencyCommManager::path(), "Current", "ServersRegistered"}));
velocypack::Slice serversAliases =
result.slice()[0].get(
std::vector<std::string>(
{AgencyCommManager::path(), "Target", "MapUniqueToShortID"}));
if (serversRegistered.isObject()) {
decltype(_servers) newServers;
decltype(_serverAliases) newAliases;
for (auto const& res : VPackObjectIterator(serversRegistered)) {
velocypack::Slice slice = res.value;
if (slice.isObject() && slice.hasKey("endpoint")) {
std::string server =
arangodb::basics::VelocyPackHelper::getStringValue(
slice, "endpoint", "");
std::string serverId = res.key.copyString();
try {
velocypack::Slice serverSlice;
serverSlice = serversAliases.get(serverId);
if (serverSlice.isObject()) {
std::string alias =
arangodb::basics::VelocyPackHelper::getStringValue(
serverSlice, "ShortName", "");
newAliases.emplace(std::make_pair(alias, serverId));
}
} catch (...) {}
newServers.emplace(std::make_pair(serverId, server));
}
}
// Now set the new value:
{
WRITE_LOCKER(writeLocker, _serversProt.lock);
_servers.swap(newServers);
_serverAliases.swap(newAliases);
_serversProt.doneVersion = storedVersion;
_serversProt.isValid = true; // will never be reset to false
}
return;
}
}
LOG_TOPIC(DEBUG, Logger::CLUSTER)
<< "Error while loading " << prefixServers
<< " httpCode: " << result.httpCode()
<< " errorCode: " << result.errorCode()
<< " errorMessage: " << result.errorMessage()
<< " body: " << result.body();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief find the endpoint of a server from its ID.
/// If it is not found in the cache, the cache is reloaded once, if
/// it is still not there an empty string is returned as an error.
////////////////////////////////////////////////////////////////////////////////
std::string ClusterInfo::getServerEndpoint(ServerID const& serverID) {
#ifdef DEBUG_SYNC_REPLICATION
if (serverID == "debug-follower") {
return "tcp://127.0.0.1:3000";
}
#endif
int tries = 0;
if (!_serversProt.isValid) {
loadServers();
tries++;
}
std::string serverID_ = serverID;
while (true) {
{
READ_LOCKER(readLocker, _serversProt.lock);
// _serversAliases is a map-type <Alias, ServerID>
auto ita = _serverAliases.find(serverID_);
if (ita != _serverAliases.end()) {
serverID_ = (*ita).second;
}
// _servers is a map-type <ServerId, std::string>
auto it = _servers.find(serverID_);
if (it != _servers.end()) {
return (*it).second;
}
}
if (++tries >= 2) {
break;
}
// must call loadServers outside the lock
loadServers();
}
return std::string();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief find the ID of a server from its endpoint.
/// If it is not found in the cache, the cache is reloaded once, if
/// it is still not there an empty string is returned as an error.
////////////////////////////////////////////////////////////////////////////////
std::string ClusterInfo::getServerName(std::string const& endpoint) {
int tries = 0;
if (!_serversProt.isValid) {
loadServers();
tries++;
}
while (true) {
{
READ_LOCKER(readLocker, _serversProt.lock);
for (auto const& it : _servers) {
if (it.second == endpoint) {
return it.first;
}
}
}
if (++tries >= 2) {
break;
}
// must call loadServers outside the lock
loadServers();
}
return std::string();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief (re-)load the information about all coordinators from the agency
/// Usually one does not have to call this directly.
////////////////////////////////////////////////////////////////////////////////
static std::string const prefixCurrentCoordinators = "Current/Coordinators";
void ClusterInfo::loadCurrentCoordinators() {
++_coordinatorsProt.wantedVersion; // Indicate that after *NOW* somebody
// has to reread from the agency!
MUTEX_LOCKER(mutexLocker, _coordinatorsProt.mutex);
uint64_t storedVersion = _coordinatorsProt.wantedVersion; // this is the
// version we will set in the end
if (_coordinatorsProt.doneVersion == storedVersion) {
// Somebody else did, what we intended to do, so just return
return;
}
// Now contact the agency:
AgencyCommResult result = _agency.getValues(prefixCurrentCoordinators);
if (result.successful()) {
velocypack::Slice currentCoordinators =
result.slice()[0].get(std::vector<std::string>(
{AgencyCommManager::path(), "Current", "Coordinators"}));
if (currentCoordinators.isObject()) {
decltype(_coordinators) newCoordinators;
for (auto const& coordinator : VPackObjectIterator(currentCoordinators)) {
newCoordinators.emplace(std::make_pair(coordinator.key.copyString(),
coordinator.value.copyString()));
}
// Now set the new value:
{
WRITE_LOCKER(writeLocker, _coordinatorsProt.lock);
_coordinators.swap(newCoordinators);
_coordinatorsProt.doneVersion = storedVersion;
_coordinatorsProt.isValid = true; // will never be reset to false
}
return;
}
}
LOG_TOPIC(DEBUG, Logger::CLUSTER)
<< "Error while loading " << prefixCurrentCoordinators
<< " httpCode: " << result.httpCode()
<< " errorCode: " << result.errorCode()
<< " errorMessage: " << result.errorMessage()
<< " body: " << result.body();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief (re-)load the information about all DBservers from the agency
/// Usually one does not have to call this directly.
////////////////////////////////////////////////////////////////////////////////
static std::string const prefixCurrentDBServers = "Current/DBServers";
static std::string const prefixTarget = "Target";
void ClusterInfo::loadCurrentDBServers() {
++_DBServersProt.wantedVersion; // Indicate that after *NOW* somebody has to
// reread from the agency!
MUTEX_LOCKER(mutexLocker, _DBServersProt.mutex);
uint64_t storedVersion = _DBServersProt.wantedVersion; // this is the version
// we will set in the end
if (_DBServersProt.doneVersion == storedVersion) {
// Somebody else did, what we intended to do, so just return
return;
}
// Now contact the agency:
AgencyCommResult result = _agency.getValues(prefixCurrentDBServers);
AgencyCommResult target = _agency.getValues(prefixTarget);
if (result.successful() && target.successful()) {
velocypack::Slice currentDBServers;
velocypack::Slice failedDBServers;
velocypack::Slice cleanedDBServers;
if (result.slice().length() > 0) {
currentDBServers = result.slice()[0].get(std::vector<std::string>(
{AgencyCommManager::path(), "Current", "DBServers"}));
}
if (target.slice().length() > 0) {
failedDBServers =
target.slice()[0].get(std::vector<std::string>(
{AgencyCommManager::path(), "Target", "FailedServers"}));
cleanedDBServers =
target.slice()[0].get(std::vector<std::string>(
{AgencyCommManager::path(), "Target", "CleanedOutServers"}));
}
if (currentDBServers.isObject() && failedDBServers.isObject()) {
decltype(_DBServers) newDBServers;
for (auto const& dbserver : VPackObjectIterator(currentDBServers)) {
bool found = false;
if (failedDBServers.isObject()) {
for (auto const& failedServer :
VPackObjectIterator(failedDBServers)) {
if (dbserver.key == failedServer.key) {
found = true;
break;
}
}
}
if (found) {
continue;
}
if (cleanedDBServers.isArray()) {
bool found = false;
for (auto const& cleanedServer :
VPackArrayIterator(cleanedDBServers)) {
if (dbserver.key == cleanedServer) {
found = true;
continue;
}
}
if (found) {
continue;
}
}
newDBServers.emplace(std::make_pair(dbserver.key.copyString(),
dbserver.value.copyString()));
}
// Now set the new value:
{
WRITE_LOCKER(writeLocker, _DBServersProt.lock);
_DBServers.swap(newDBServers);
_DBServersProt.doneVersion = storedVersion;
_DBServersProt.isValid = true; // will never be reset to false
}
return;
}
}
LOG_TOPIC(DEBUG, Logger::CLUSTER)
<< "Error while loading " << prefixCurrentDBServers
<< " httpCode: " << result.httpCode()
<< " errorCode: " << result.errorCode()
<< " errorMessage: " << result.errorMessage()
<< " body: " << result.body();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief return a list of all DBServers in the cluster that have
/// currently registered
////////////////////////////////////////////////////////////////////////////////
std::vector<ServerID> ClusterInfo::getCurrentDBServers() {
std::vector<ServerID> result;
if (!_DBServersProt.isValid) {
loadCurrentDBServers();
}
// return a consistent state of servers
READ_LOCKER(readLocker, _DBServersProt.lock);
result.reserve(_DBServers.size());
for (auto& it : _DBServers) {
result.emplace_back(it.first);
}
return result;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief find the servers who are responsible for a shard (one leader
/// and multiple followers)
/// If it is not found in the cache, the cache is reloaded once, if
/// it is still not there an empty string is returned as an error.
////////////////////////////////////////////////////////////////////////////////
std::shared_ptr<std::vector<ServerID>> ClusterInfo::getResponsibleServer(
ShardID const& shardID) {
int tries = 0;
if (!_currentProt.isValid) {
loadCurrent();
tries++;
}
while (true) {
{
{
READ_LOCKER(readLocker, _currentProt.lock);
// _shardIds is a map-type <ShardId,
// std::shared_ptr<std::vector<ServerId>>>
auto it = _shardIds.find(shardID);
if (it != _shardIds.end()) {
auto serverList = (*it).second;
if (serverList != nullptr && serverList->size() > 0 &&
(*serverList)[0].size() > 0 && (*serverList)[0][0] == '_') {
// This is a temporary situation in which the leader has already
// resigned, let's wait half a second and try again.
--tries;
LOG_TOPIC(INFO, Logger::CLUSTER)
<< "getResponsibleServer: found resigned leader,"
<< "waiting for half a second...";
} else {
return (*it).second;
}
}
}
std::this_thread::sleep_for(std::chrono::microseconds(500000));
}
if (++tries >= 2) {
break;
}
// must load collections outside the lock
loadCurrent();
}
return std::make_shared<std::vector<ServerID>>();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief find the shard list of a collection, sorted numerically
////////////////////////////////////////////////////////////////////////////////
std::shared_ptr<std::vector<ShardID>> ClusterInfo::getShardList(
CollectionID const& collectionID) {
if (!_planProt.isValid) {
loadPlan();
}
int tries = 0;
while (true) {
{
// Get the sharding keys and the number of shards:
READ_LOCKER(readLocker, _planProt.lock);
// _shards is a map-type <CollectionId, shared_ptr<vector<string>>>
auto it = _shards.find(collectionID);
if (it != _shards.end()) {
return it->second;
}
}
if (++tries >= 2) {
return std::make_shared<std::vector<ShardID>>();
}
loadPlan();
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief find the shard that is responsible for a document, which is given
/// as a VelocyPackSlice.
///
/// There are two modes, one assumes that the document is given as a
/// whole (`docComplete`==`true`), in this case, the non-existence of
/// values for some of the sharding attributes is silently ignored
/// and treated as if these values were `null`. In the second mode
/// (`docComplete`==false) leads to an error which is reported by
/// returning TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND, which is the only
/// error code that can be returned.
///
/// In either case, if the collection is found, the variable
/// shardID is set to the ID of the responsible shard and the flag
/// `usesDefaultShardingAttributes` is used set to `true` if and only if
/// `_key` is the one and only sharding attribute.
////////////////////////////////////////////////////////////////////////////////
#ifndef USE_ENTERPRISE
int ClusterInfo::getResponsibleShard(LogicalCollection* collInfo,
VPackSlice slice, bool docComplete,
ShardID& shardID,
bool& usesDefaultShardingAttributes,
std::string const& key) {
// Note that currently we take the number of shards and the shardKeys
// from Plan, since they are immutable. Later we will have to switch
// this to Current, when we allow to add and remove shards.
if (!_planProt.isValid) {
loadPlan();
}
int tries = 0;
std::shared_ptr<std::vector<std::string>> shardKeysPtr;
std::shared_ptr<std::vector<ShardID>> shards;
bool found = false;
CollectionID collectionId = std::to_string(collInfo->planId());
while (true) {
{
// Get the sharding keys and the number of shards:
READ_LOCKER(readLocker, _planProt.lock);
// _shards is a map-type <CollectionId, shared_ptr<vector<string>>>
auto it = _shards.find(collectionId);
if (it != _shards.end()) {
shards = it->second;
// _shardKeys is a map-type <CollectionID, shared_ptr<vector<string>>>
auto it2 = _shardKeys.find(collectionId);
if (it2 != _shardKeys.end()) {
shardKeysPtr = it2->second;
usesDefaultShardingAttributes =
shardKeysPtr->size() == 1 &&
shardKeysPtr->at(0) == StaticStrings::KeyString;
found = true;
break; // all OK
}
}
}
if (++tries >= 2) {
break;
}
loadPlan();
}
if (!found) {
return TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND;
}
int error = TRI_ERROR_NO_ERROR;
uint64_t hash = arangodb::basics::VelocyPackHelper::hashByAttributes(
slice, *shardKeysPtr, docComplete, error, key);
static char const* magicPhrase =
"Foxx you have stolen the goose, give she back again!";
static size_t const len = 52;
// To improve our hash function:
hash = TRI_FnvHashBlock(hash, magicPhrase, len);
shardID = shards->at(hash % shards->size());
return error;
}
#endif
////////////////////////////////////////////////////////////////////////////////
/// @brief return the list of coordinator server names
////////////////////////////////////////////////////////////////////////////////
std::vector<ServerID> ClusterInfo::getCurrentCoordinators() {
std::vector<ServerID> result;
if (!_coordinatorsProt.isValid) {
loadCurrentCoordinators();
}
// return a consistent state of servers
READ_LOCKER(readLocker, _coordinatorsProt.lock);
result.reserve(_coordinators.size());
for (auto& it : _coordinators) {
result.emplace_back(it.first);
}
return result;
}
//////////////////////////////////////////////////////////////////////////////
/// @brief invalidate plan
//////////////////////////////////////////////////////////////////////////////
void ClusterInfo::invalidatePlan() {
{
WRITE_LOCKER(writeLocker, _planProt.lock);
_planProt.isValid = false;
}
{
WRITE_LOCKER(writeLocker, _planProt.lock);
_planProt.isValid = false;
}
}
//////////////////////////////////////////////////////////////////////////////
/// @brief invalidate current coordinators
//////////////////////////////////////////////////////////////////////////////
void ClusterInfo::invalidateCurrentCoordinators() {
{
WRITE_LOCKER(writeLocker, _coordinatorsProt.lock);
_coordinatorsProt.isValid = false;
}
}
//////////////////////////////////////////////////////////////////////////////
/// @brief invalidate current
//////////////////////////////////////////////////////////////////////////////
void ClusterInfo::invalidateCurrent() {
{
WRITE_LOCKER(writeLocker, _serversProt.lock);
_serversProt.isValid = false;
}
{
WRITE_LOCKER(writeLocker, _DBServersProt.lock);
_DBServersProt.isValid = false;
}
{
WRITE_LOCKER(writeLocker, _currentProt.lock);
_currentProt.isValid = false;
}
invalidateCurrentCoordinators();
}
//////////////////////////////////////////////////////////////////////////////
/// @brief get current "Plan" structure
//////////////////////////////////////////////////////////////////////////////
std::shared_ptr<VPackBuilder> ClusterInfo::getPlan() {
if (!_planProt.isValid) {
loadPlan();
}
READ_LOCKER(readLocker, _planProt.lock);
return _plan;
}
//////////////////////////////////////////////////////////////////////////////
/// @brief get current "Current" structure
//////////////////////////////////////////////////////////////////////////////
std::shared_ptr<VPackBuilder> ClusterInfo::getCurrent() {
if (!_currentProt.isValid) {
loadCurrent();
}
READ_LOCKER(readLocker, _currentProt.lock);
return _current;
}
std::unordered_map<ServerID, std::string> ClusterInfo::getServers() {
if (!_serversProt.isValid) {
loadServers();
}
READ_LOCKER(readLocker, _serversProt.lock);
std::unordered_map<ServerID, std::string> serv = _servers;
return serv;
}
std::unordered_map<ServerID, std::string> ClusterInfo::getServerAliases() {
READ_LOCKER(readLocker, _serversProt.lock);
std::unordered_map<std::string,std::string> ret;
for (const auto& i : _serverAliases) {
ret.emplace(i.second,i.first);
}
return ret;
}
// -----------------------------------------------------------------------------
// --SECTION-- END-OF-FILE
// -----------------------------------------------------------------------------
Reference in New Issue View Git Blame Copy Permalink