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arangodb/arangod/Replication/DatabaseInitialSyncer.cpp

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////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2017 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 Jan Steemann
////////////////////////////////////////////////////////////////////////////////
#include "DatabaseInitialSyncer.h"
#include "ApplicationFeatures/ApplicationServer.h"
#include "Basics/Exceptions.h"
#include "Basics/ReadLocker.h"
#include "Basics/Result.h"
#include "Basics/RocksDBUtils.h"
#include "Basics/StaticStrings.h"
#include "Basics/StringUtils.h"
#include "Basics/VelocyPackHelper.h"
#include "Indexes/Index.h"
#include "Indexes/IndexIterator.h"
#include "Logger/Logger.h"
#include "Replication/DatabaseReplicationApplier.h"
#include "RestServer/DatabaseFeature.h"
#include "SimpleHttpClient/SimpleHttpClient.h"
#include "SimpleHttpClient/SimpleHttpResult.h"
#include "StorageEngine/EngineSelectorFeature.h"
#include "StorageEngine/PhysicalCollection.h"
#include "StorageEngine/StorageEngine.h"
#include "Transaction/Helpers.h"
#include "Transaction/StandaloneContext.h"
#include "Utils/CollectionGuard.h"
#include "Utils/OperationOptions.h"
#include "VocBase/LogicalCollection.h"
#include "VocBase/ManagedDocumentResult.h"
#include "VocBase/voc-types.h"
#include "VocBase/vocbase.h"
#include <cstring>
#include <array>
#include <cstring>
#include <velocypack/Builder.h>
#include <velocypack/Iterator.h>
#include <velocypack/Slice.h>
#include <velocypack/Validator.h>
#include <velocypack/velocypack-aliases.h>
using namespace arangodb;
using namespace arangodb::basics;
using namespace arangodb::httpclient;
using namespace arangodb::rest;
size_t const DatabaseInitialSyncer::MaxChunkSize = 10 * 1024 * 1024;
DatabaseInitialSyncer::DatabaseInitialSyncer(
TRI_vocbase_t& vocbase,
ReplicationApplierConfiguration const& configuration
): InitialSyncer(configuration),
_vocbase(vocbase),
_hasFlushed(false) {
_vocbases.emplace(
std::piecewise_construct,
std::forward_as_tuple(vocbase.name()),
std::forward_as_tuple(vocbase)
);
if (configuration._database.empty()) {
_databaseName = vocbase.name();
}
}
/// @brief run method, performs a full synchronization
Result DatabaseInitialSyncer::runWithInventory(bool incremental,
VPackSlice inventoryColls) {
if (_client == nullptr || _connection == nullptr || _endpoint == nullptr) {
return Result(TRI_ERROR_INTERNAL, "invalid endpoint");
}
auto res = vocbase().replicationApplier()->preventStart();
if (res.fail()) {
return res;
}
TRI_DEFER(vocbase().replicationApplier()->allowStart());
setAborted(false);
double const startTime = TRI_microtime();
try {
setProgress("fetching master state");
LOG_TOPIC(DEBUG, Logger::REPLICATION)
<< "client: getting master state to dump " << vocbase().name();
Result r;
if (!_isChildSyncer) {
r = getMasterState();
if (r.fail()) {
return r;
}
}
TRI_ASSERT(!_masterInfo._endpoint.empty());
TRI_ASSERT(_masterInfo._serverId != 0);
TRI_ASSERT(_masterInfo._majorVersion != 0);
LOG_TOPIC(DEBUG, Logger::REPLICATION) << "client: got master state";
if (incremental) {
if (_masterInfo._majorVersion == 1 ||
(_masterInfo._majorVersion == 2 && _masterInfo._minorVersion <= 6)) {
LOG_TOPIC(WARN, Logger::REPLICATION) << "incremental replication is "
"not supported with a master < "
"ArangoDB 2.7";
incremental = false;
} else {
r = sendFlush();
if (r.fail()) {
return r;
}
}
}
// create a WAL logfile barrier that prevents WAL logfile collection
// TODO: why are we ignoring the return value here?
sendCreateBarrier(_masterInfo._lastLogTick);
r = sendStartBatch();
if (r.fail()) {
return r;
}
VPackBuilder inventoryResponse;
if (!inventoryColls.isArray()) {
// caller did not supply an inventory, we need to fetch it
Result res = fetchInventory(inventoryResponse);
if (!res.ok()) {
return res;
}
// we do not really care about the state response
inventoryColls = inventoryResponse.slice().get("collections");
if (!inventoryColls.isArray()) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE,
"collections section is missing from response");
}
}
// strip eventual objectIDs and then dump the collections
auto pair = rocksutils::stripObjectIds(inventoryColls);
r = handleLeaderCollections(pair.first, incremental);
// all done here, do not try to finish batch if master is unresponsive
if (r.isNot(TRI_ERROR_REPLICATION_NO_RESPONSE)) {
sendFinishBatch();
}
if (r.fail()) {
LOG_TOPIC(ERR, Logger::REPLICATION) << "Error during initial sync: " << r.errorMessage();
}
LOG_TOPIC(DEBUG, Logger::REPLICATION) << "initial synchronization with master took: "
<< Logger::FIXED(TRI_microtime() - startTime, 6) << " s. status: " << r.errorMessage();
return r;
} catch (arangodb::basics::Exception const& ex) {
sendFinishBatch();
return Result(ex.code(), ex.what());
} catch (std::exception const& ex) {
sendFinishBatch();
return Result(TRI_ERROR_INTERNAL, ex.what());
} catch (...) {
sendFinishBatch();
return Result(TRI_ERROR_NO_ERROR, "an unknown exception occurred");
}
}
/// @brief check whether the initial synchronization should be aborted
bool DatabaseInitialSyncer::isAborted() const {
if (application_features::ApplicationServer::isStopping() ||
(vocbase().replicationApplier() != nullptr &&
vocbase().replicationApplier()->stopInitialSynchronization())) {
return true;
}
return Syncer::isAborted();
}
void DatabaseInitialSyncer::setProgress(std::string const& msg) {
_progress = msg;
if (_configuration._verbose) {
LOG_TOPIC(INFO, Logger::REPLICATION) << msg;
} else {
LOG_TOPIC(DEBUG, Logger::REPLICATION) << msg;
}
auto* applier = vocbase().replicationApplier();
if (applier != nullptr) {
applier->setProgress(msg);
}
}
/// @brief send a WAL flush command
Result DatabaseInitialSyncer::sendFlush() {
std::string const url = "/_admin/wal/flush";
std::string const body =
"{\"waitForSync\":true,\"waitForCollector\":true,"
"\"waitForCollectorQueue\":true}";
// send request
std::string const progress = "sending WAL flush command to url " + url;
setProgress(progress);
std::unique_ptr<SimpleHttpResult> response(_client->retryRequest(
rest::RequestType::PUT, url, body.c_str(), body.size()));
if (hasFailed(response.get())) {
return buildHttpError(response.get(), url);
}
_hasFlushed = true;
return Result();
}
namespace {
std::string const kTypeString = "type";
std::string const kDataString = "data";
}
/// @brief handle a single dump marker
Result DatabaseInitialSyncer::parseCollectionDumpMarker(transaction::Methods& trx,
LogicalCollection* coll,
VPackSlice const& marker) {
if (!marker.isObject()) {
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
TRI_replication_operation_e type = REPLICATION_INVALID;
VPackSlice doc;
for (auto const& it : VPackObjectIterator(marker, true)) {
if (it.key.isEqualString(kTypeString)) {
if (it.value.isNumber()) {
type = static_cast<TRI_replication_operation_e>(it.value.getNumber<int>());
}
} else if (it.key.isEqualString(kDataString)) {
if (it.value.isObject()) {
doc = it.value;
}
}
if (type != REPLICATION_INVALID && doc.isObject()) {
break;
}
}
if (!doc.isObject()) {
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
// key must not be empty, but doc can otherwise be empty
VPackSlice key = doc.get(StaticStrings::KeyString);
if (!key.isString() || key.getStringLength() == 0) {
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
return applyCollectionDumpMarker(trx, coll, type, doc);
}
/// @brief apply the data from a collection dump
Result DatabaseInitialSyncer::parseCollectionDump(transaction::Methods& trx,
LogicalCollection* coll,
SimpleHttpResult* response,
uint64_t& markersProcessed) {
std::string const invalidMsg =
"received invalid dump data for collection '" + coll->name() + "'";
StringBuffer const& data = response->getBody();
char const* p = data.begin();
char const* end = p + data.length();
bool found = false;
std::string cType = response->getHeaderField(StaticStrings::ContentTypeHeader, found);
if (found && (cType == StaticStrings::MimeTypeVPack)) {
VPackOptions options;
options.unsupportedTypeBehavior = VPackOptions::FailOnUnsupportedType;
VPackValidator validator(&options);
try {
while (p < end) {
ptrdiff_t remaining = end - p;
// throws if the data is invalid
validator.validate(p, remaining, /*isSubPart*/true);
VPackSlice marker(p);
Result r = parseCollectionDumpMarker(trx, coll, marker);
if (r.fail()) {
r.reset(r.errorNumber(), invalidMsg);
return r;
}
++markersProcessed;
p += marker.byteSize();
}
} catch(velocypack::Exception const& e) {
LOG_TOPIC(ERR, Logger::REPLICATION) << "Error parsing VPack response: " << e.what();
return Result(e.errorCode(), e.what());
}
} else {
// buffer must end with a NUL byte
TRI_ASSERT(*end == '\0');
VPackBuilder builder;
while (p < end) {
char const* q = strchr(p, '\n');
if (q == nullptr) {
q = end;
}
if (q - p < 2) {
// we are done
return Result();
}
TRI_ASSERT(q <= end);
try {
builder.clear();
VPackParser parser(builder);
parser.parse(p, static_cast<size_t>(q - p));
} catch (velocypack::Exception const& e) {
LOG_TOPIC(ERR, Logger::REPLICATION) << "while parsing collection dump: " << e.what();
return Result(e.errorCode(), e.what());
}
p = q + 1;
Result r = parseCollectionDumpMarker(trx, coll, builder.slice());
if (r.fail()) {
return r;
}
++markersProcessed;
}
}
// reached the end
return Result();
}
// lets keep this experimental until we make it faster
#define VPACK_DUMP 0
/// @brief incrementally fetch data from a collection
Result DatabaseInitialSyncer::fetchCollectionDump(arangodb::LogicalCollection* coll,
std::string const& leaderColl,
TRI_voc_tick_t maxTick) {
std::string appendix;
if (_hasFlushed) {
appendix = "&flush=false";
} else {
// only flush WAL once
appendix = "&flush=true&flushWait=15";
_hasFlushed = true;
}
uint64_t chunkSize = _configuration._chunkSize;
TRI_ASSERT(_batchId); // should not be equal to 0
std::string const baseUrl = ReplicationUrl + "/dump?collection=" + StringUtils::urlEncode(leaderColl) +
"&batchId=" + std::to_string(_batchId) + appendix;
TRI_voc_tick_t fromTick = 0;
int batch = 1;
uint64_t bytesReceived = 0;
uint64_t markersProcessed = 0;
#if VPACK_DUMP
double const nowTotal = TRI_microtime();
double sumFetchTime = 0;
double sumApplyTime = 0;
#endif
while (true) {
if (isAborted()) {
return Result(TRI_ERROR_REPLICATION_APPLIER_STOPPED);
}
sendExtendBatch();
sendExtendBarrier();
std::string url = baseUrl + "&from=" + StringUtils::itoa(fromTick);
if (maxTick > 0) {
url += "&to=" + StringUtils::itoa(maxTick + 1);
}
url += "&serverId=" + _localServerIdString;
url += "&chunkSize=" + StringUtils::itoa(chunkSize);
url += "&includeSystem=" + std::string(_configuration._includeSystem ? "true" : "false");
std::string const typeString =
(coll->type() == TRI_COL_TYPE_EDGE ? "edge" : "document");
// send request
std::string const progress =
"fetching master collection dump for collection '" + coll->name() +
"', type: " + typeString + ", id " + leaderColl + ", batch " +
StringUtils::itoa(batch) +
", markers processed: " + StringUtils::itoa(markersProcessed) +
", bytes received: " + StringUtils::itoa(bytesReceived);
setProgress(progress);
// use async mode for first batch
auto headers = createHeaders();
if (batch == 1) {
headers[StaticStrings::Async] = "store";
}
#if VPACK_DUMP
int vv = _masterInfo._majorVersion * 1000000 + _masterInfo._minorVersion * 1000;
if (vv >= 3003009) {
headers[StaticStrings::Accept] = StaticStrings::MimeTypeVPack;
}
double fetchTimeNow = TRI_microtime();
#endif
std::unique_ptr<SimpleHttpResult> response(_client->retryRequest(
rest::RequestType::GET, url, nullptr, 0, headers));
if (hasFailed(response.get())) {
return buildHttpError(response.get(), url);
}
// use async mode for first batch
if (batch == 1) {
bool found = false;
std::string jobId =
response->getHeaderField(StaticStrings::AsyncId, found);
if (!found) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE, std::string("got invalid response from master at ") +
_masterInfo._endpoint + url + ": could not find 'X-Arango-Async' header");
}
double const startTime = TRI_microtime();
// wait until we get a responsable response
while (true) {
sendExtendBatch();
sendExtendBarrier();
std::string const jobUrl = "/_api/job/" + jobId;
response.reset(
_client->request(rest::RequestType::PUT, jobUrl, nullptr, 0));
if (response != nullptr && response->isComplete()) {
if (response->hasHeaderField("x-arango-async-id")) {
// got the actual response
break;
}
if (response->getHttpReturnCode() == 404) {
// unknown job, we can abort
return Result(TRI_ERROR_REPLICATION_NO_RESPONSE, std::string("job not found on master at ") + _masterInfo._endpoint);
}
}
double waitTime = TRI_microtime() - startTime;
if (static_cast<uint64_t>(waitTime * 1000.0 * 1000.0) >=
_configuration._initialSyncMaxWaitTime) {
return Result(TRI_ERROR_REPLICATION_NO_RESPONSE, std::string("timed out waiting for response from master at ") + _masterInfo._endpoint);
}
std::chrono::milliseconds sleepTime;
if (waitTime < 5.0) {
sleepTime = std::chrono::milliseconds(250);
} else if (waitTime < 20.0) {
sleepTime = std::chrono::milliseconds(500);
} else if (waitTime < 60.0) {
sleepTime = std::chrono::seconds(1);
} else {
sleepTime = std::chrono::seconds(2);
}
if (isAborted()) {
return Result(TRI_ERROR_REPLICATION_APPLIER_STOPPED);
}
std::this_thread::sleep_for(sleepTime);
}
// fallthrough here in case everything went well
}
#if VPACK_DUMP
sumFetchTime += (TRI_microtime() - fetchTimeNow);
#endif
if (hasFailed(response.get())) {
return buildHttpError(response.get(), url);
}
if (response->hasContentLength()) {
bytesReceived += response->getContentLength();
}
bool found;
std::string header = response->getHeaderField(StaticStrings::ReplicationHeaderCheckMore, found);
if (!found) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE, std::string("got invalid response from master at ") +
_masterInfo._endpoint + url + ": required header " + StaticStrings::ReplicationHeaderCheckMore +
" is missing in dump response");
}
TRI_voc_tick_t tick;
bool checkMore = StringUtils::boolean(header);
if (checkMore) {
header = response->getHeaderField(StaticStrings::ReplicationHeaderLastIncluded,
found);
if (!found) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE, std::string("got invalid response from master at ") +
_masterInfo._endpoint + url + ": required header " + StaticStrings::ReplicationHeaderLastIncluded
+ " is missing in dump response");
}
tick = StringUtils::uint64(header);
if (tick > fromTick) {
fromTick = tick;
} else {
// we got the same tick again, this indicates we're at the end
checkMore = false;
}
}
#if VPACK_DUMP
double applyTimeNow = TRI_microtime();
#endif
SingleCollectionTransaction trx(
transaction::StandaloneContext::Create(vocbase()),
coll->id(),
AccessMode::Type::EXCLUSIVE
);
// to turn off waitForSync!
trx.addHint(transaction::Hints::Hint::RECOVERY);
// smaller batch sizes should work better here
#if VPACK_DUMP
trx.state()->options().intermediateCommitCount = 128;
trx.state()->options().intermediateCommitSize = 16 * 1024 * 1024;
#endif
Result res = trx.begin();
if (!res.ok()) {
return Result(res.errorNumber(), std::string("unable to start transaction: ") + res.errorMessage());
}
trx.pinData(coll->id()); // will throw when it fails
res = parseCollectionDump(trx, coll, response.get(), markersProcessed);
if (res.fail()) {
return res;
}
res = trx.commit();
#if VPACK_DUMP
sumApplyTime += (TRI_microtime() - applyTimeNow);
#endif
std::string const progress2 =
"fetched master collection dump for collection '" + coll->name() +
"', type: " + typeString + ", id " + leaderColl + ", batch " +
StringUtils::itoa(batch) +
", markers processed: " + StringUtils::itoa(markersProcessed) +
", bytes received: " + StringUtils::itoa(bytesReceived);
setProgress(progress2);
if (!res.ok()) {
return res;
}
if (!checkMore || fromTick == 0) {
#if VPACK_DUMP
LOG_TOPIC(ERR, Logger::FIXME) << "Collection " << leaderColl << ", local: " << coll->name();
LOG_TOPIC(ERR, Logger::FIXME) << "Fetching dump: " << sumFetchTime;
LOG_TOPIC(ERR, Logger::FIXME) << "Applying dump: " << sumApplyTime;
LOG_TOPIC(ERR, Logger::FIXME) << "Total: " << (TRI_microtime() - nowTotal);
LOG_TOPIC(ERR, Logger::FIXME) << "Markers processed: " << markersProcessed;
#endif
// done
return Result();
}
// increase chunk size for next fetch
if (chunkSize < MaxChunkSize) {
chunkSize = static_cast<uint64_t>(chunkSize * 1.25);
if (chunkSize > MaxChunkSize) {
chunkSize = MaxChunkSize;
}
}
batch++;
}
TRI_ASSERT(false);
return Result(TRI_ERROR_INTERNAL);
}
/// @brief incrementally fetch data from a collection
Result DatabaseInitialSyncer::fetchCollectionSync(arangodb::LogicalCollection* coll,
std::string const& leaderColl,
TRI_voc_tick_t maxTick) {
sendExtendBatch();
sendExtendBarrier();
std::string const baseUrl = ReplicationUrl + "/keys";
std::string url = baseUrl + "/keys" +
"?collection=" + StringUtils::urlEncode(leaderColl) +
"&to=" + std::to_string(maxTick) +
"&serverId=" + _localServerIdString +
"&batchId=" + std::to_string(_batchId);
std::string progress = "fetching collection keys for collection '" +
coll->name() + "' from " + url;
setProgress(progress);
// send an initial async request to collect the collection keys on the other
// side
// sending this request in a blocking fashion may require very long to
// complete,
// so we're sending the x-arango-async header here
auto headers = createHeaders();
headers[StaticStrings::Async] = "store";
std::unique_ptr<SimpleHttpResult> response(
_client->retryRequest(rest::RequestType::POST, url, nullptr, 0, headers));
if (hasFailed(response.get())) {
return buildHttpError(response.get(), url);
}
bool found = false;
std::string jobId = response->getHeaderField(StaticStrings::AsyncId, found);
if (!found) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE, std::string("got invalid response from master at ")
+ _masterInfo._endpoint + url + ": could not find 'X-Arango-Async' header");
}
double const startTime = TRI_microtime();
while (true) {
sendExtendBatch();
sendExtendBarrier();
std::string const jobUrl = "/_api/job/" + jobId;
response.reset(
_client->request(rest::RequestType::PUT, jobUrl, nullptr, 0));
if (response != nullptr && response->isComplete()) {
if (response->hasHeaderField("x-arango-async-id")) {
// job is done, got the actual response
break;
}
if (response->getHttpReturnCode() == 404) {
// unknown job, we can abort
return Result(TRI_ERROR_REPLICATION_NO_RESPONSE, std::string("job not found on master at ") + _masterInfo._endpoint);
}
}
double waitTime = TRI_microtime() - startTime;
if (static_cast<uint64_t>(waitTime * 1000.0 * 1000.0) >=
_configuration._initialSyncMaxWaitTime) {
return Result(TRI_ERROR_REPLICATION_NO_RESPONSE, std::string("timed out waiting for response from master at ") + _masterInfo._endpoint);
}
std::chrono::milliseconds sleepTime;
if (waitTime < 5.0) {
sleepTime = std::chrono::milliseconds(250);
} else if (waitTime < 20.0) {
sleepTime = std::chrono::milliseconds(500);
} else if (waitTime < 60.0) {
sleepTime = std::chrono::seconds(1);
} else {
sleepTime = std::chrono::seconds(2);
}
if (isAborted()) {
return Result(TRI_ERROR_REPLICATION_APPLIER_STOPPED);
}
std::this_thread::sleep_for(sleepTime);
}
if (hasFailed(response.get())) {
return buildHttpError(response.get(), url);
}
VPackBuilder builder;
Result r = parseResponse(builder, response.get());
if (r.fail()) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE, std::string("got invalid response from master at ") +
_masterInfo._endpoint + url + ": " + r.errorMessage());
}
VPackSlice const slice = builder.slice();
if (!slice.isObject()) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE, std::string("got invalid response from master at ") +
_masterInfo._endpoint + url + ": response is no object");
}
VPackSlice const keysId = slice.get("id");
if (!keysId.isString()) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE, std::string("got invalid response from master at ") +
_masterInfo._endpoint + url + ": response does not contain valid 'id' attribute");
}
auto shutdown = [&]() -> void {
url = baseUrl + "/" + keysId.copyString();
std::string progress =
"deleting remote collection keys object for collection '" +
coll->name() + "' from " + url;
setProgress(progress);
// now delete the keys we ordered
std::unique_ptr<SimpleHttpResult> response(
_client->retryRequest(rest::RequestType::DELETE_REQ, url, nullptr, 0));
};
TRI_DEFER(shutdown());
VPackSlice const count = slice.get("count");
if (!count.isNumber()) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE, std::string("got invalid response from master at ") +
_masterInfo._endpoint + url + ": response does not contain valid 'count' attribute");
}
if (count.getNumber<size_t>() <= 0) {
// remote collection has no documents. now truncate our local collection
SingleCollectionTransaction trx(
transaction::StandaloneContext::Create(vocbase()),
coll->id(),
AccessMode::Type::EXCLUSIVE
);
Result res = trx.begin();
if (!res.ok()) {
return Result(res.errorNumber(), std::string("unable to start transaction (") + std::string(__FILE__) + std::string(":") + std::to_string(__LINE__) + std::string("): ") + res.errorMessage());
}
OperationOptions options;
if (!_leaderId.empty()) {
options.isSynchronousReplicationFrom = _leaderId;
}
OperationResult opRes = trx.truncate(coll->name(), options);
if (opRes.fail()) {
return Result(opRes.errorNumber(), std::string("unable to truncate collection '") + coll->name()
+ "': " + TRI_errno_string(opRes.errorNumber()));
}
return trx.finish(opRes.result);
}
// now we can fetch the complete chunk information from the master
try {
return EngineSelectorFeature::ENGINE->handleSyncKeys(
*this, *coll, keysId.copyString()
);
} catch (arangodb::basics::Exception const& ex) {
return Result(ex.code(), ex.what());
} catch (std::exception const& ex) {
return Result(TRI_ERROR_INTERNAL, ex.what());
} catch (...) {
return Result(TRI_ERROR_INTERNAL);
}
}
/// @brief incrementally fetch data from a collection
/// @brief changes the properties of a collection, based on the VelocyPack
/// provided
Result DatabaseInitialSyncer::changeCollection(arangodb::LogicalCollection* col,
VPackSlice const& slice) {
arangodb::CollectionGuard guard(&vocbase(), col->id());
bool doSync =
application_features::ApplicationServer::getFeature<DatabaseFeature>(
"Database")
->forceSyncProperties();
return guard.collection()->updateProperties(slice, doSync);
}
/// @brief determine the number of documents in a collection
int64_t DatabaseInitialSyncer::getSize(arangodb::LogicalCollection* col) {
SingleCollectionTransaction trx(
transaction::StandaloneContext::Create(vocbase()),
col->id(),
AccessMode::Type::READ
);
Result res = trx.begin();
if (res.fail()) {
return -1;
}
OperationResult result = trx.count(col->name(), false);
if (result.result.fail()) {
return -1;
}
VPackSlice s = result.slice();
if (!s.isNumber()) {
return -1;
}
return s.getNumber<int64_t>();
}
/// @brief handle the information about a collection
Result DatabaseInitialSyncer::handleCollection(VPackSlice const& parameters,
VPackSlice const& indexes, bool incremental,
sync_phase_e phase) {
if (isAborted()) {
return Result(TRI_ERROR_REPLICATION_APPLIER_STOPPED);
}
if (!parameters.isObject() || !indexes.isArray()) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE);
}
sendExtendBatch();
sendExtendBarrier();
std::string const masterName =
VelocyPackHelper::getStringValue(parameters, "name", "");
TRI_voc_cid_t const masterCid = VelocyPackHelper::extractIdValue(parameters);
if (masterCid == 0) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE, "collection id is missing in response");
}
std::string const masterUuid =
VelocyPackHelper::getStringValue(parameters, "globallyUniqueId", "");
VPackSlice const type = parameters.get("type");
if (!type.isNumber()) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE, "collection type is missing in response");
}
std::string const typeString =
(type.getNumber<int>() == 3 ? "edge" : "document");
std::string const collectionMsg = "collection '" + masterName + "', type " +
typeString + ", id " +
StringUtils::itoa(masterCid);
// phase handling
if (phase == PHASE_VALIDATE) {
// validation phase just returns ok if we got here (aborts above if data is
// invalid)
_processedCollections.emplace(masterCid, masterName);
return Result();
}
// drop and re-create collections locally
// -------------------------------------------------------------------------------------
if (phase == PHASE_DROP_CREATE) {
auto* col = resolveCollection(vocbase(), parameters).get();
if (col == nullptr) {
// not found...
col = vocbase().lookupCollection(masterName).get();
if (col != nullptr
&& (col->name() != masterName
|| (!masterUuid.empty() && col->guid() != masterUuid))) {
// found another collection with the same name locally.
// in this case we must drop it because we will run into duplicate
// name conflicts otherwise
try {
auto res =
vocbase().dropCollection(col->id(), true, -1.0).errorNumber();
if (res == TRI_ERROR_NO_ERROR) {
col = nullptr;
}
} catch (...) {
}
}
}
if (col != nullptr) {
if (!incremental) {
// first look up the collection
if (col != nullptr) {
bool truncate = false;
if (col->name() == TRI_COL_NAME_USERS) {
// better not throw away the _users collection. otherwise it is gone
// and this may be a problem if the
// server crashes in-between.
truncate = true;
}
if (truncate) {
// system collection
setProgress("truncating " + collectionMsg);
SingleCollectionTransaction trx(
transaction::StandaloneContext::Create(vocbase()),
col->id(),
AccessMode::Type::EXCLUSIVE
);
Result res = trx.begin();
if (!res.ok()) {
return Result(res.errorNumber(), std::string("unable to truncate ") + collectionMsg + ": " + res.errorMessage());
}
OperationOptions options;
if (!_leaderId.empty()) {
options.isSynchronousReplicationFrom = _leaderId;
}
OperationResult opRes = trx.truncate(col->name(), options);
if (opRes.fail()) {
return Result(opRes.errorNumber(), std::string("unable to truncate ") + collectionMsg + ": " + TRI_errno_string(opRes.errorNumber()));
}
res = trx.finish(opRes.result);
if (!res.ok()) {
return Result(res.errorNumber(), std::string("unable to truncate ") + collectionMsg + ": " + res.errorMessage());
}
} else {
// drop a regular collection
if (_configuration._skipCreateDrop) {
setProgress("dropping " + collectionMsg + " skipped because of configuration");
return Result();
}
setProgress("dropping " + collectionMsg);
auto res =
vocbase().dropCollection(col->id(), true, -1.0).errorNumber();
if (res != TRI_ERROR_NO_ERROR) {
return Result(res, std::string("unable to drop ") + collectionMsg + ": " + TRI_errno_string(res));
}
}
}
} else {
// incremental case
TRI_ASSERT(incremental);
// collection is already present
std::string const progress =
"checking/changing parameters of " + collectionMsg;
setProgress(progress);
return changeCollection(col, parameters);
}
}
std::string progress = "creating " + collectionMsg;
if (_configuration._skipCreateDrop) {
progress += " skipped because of configuration";
setProgress(progress);
return Result();
}
setProgress(progress);
LOG_TOPIC(DEBUG, Logger::REPLICATION) << "Dump is creating collection "
<< parameters.toJson();
auto r = createCollection(vocbase(), parameters, &col);
if (r.fail()) {
return Result(r.errorNumber(), std::string("unable to create ") +
collectionMsg + ": " + TRI_errno_string(r.errorNumber()) +
". Collection info " + parameters.toJson());
}
return r;
}
// sync collection data
// -------------------------------------------------------------------------------------
else if (phase == PHASE_DUMP) {
std::string const progress = "dumping data for " + collectionMsg;
setProgress(progress);
auto* col = resolveCollection(vocbase(), parameters).get();
if (col == nullptr) {
return Result(TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND, std::string("cannot dump: ") +
collectionMsg + " not found on slave. Collection info " + parameters.toJson());
}
Result res;
std::string const& masterColl = !masterUuid.empty() ? masterUuid : StringUtils::itoa(masterCid);
if (incremental && getSize(col) > 0) {
res = fetchCollectionSync(col, masterColl, _masterInfo._lastLogTick);
} else {
res = fetchCollectionDump(col, masterColl, _masterInfo._lastLogTick);
}
if (!res.ok()) {
return res;
}
if (masterName == TRI_COL_NAME_USERS) {
reloadUsers();
}
// now create indexes
TRI_ASSERT(indexes.isArray());
VPackValueLength const n = indexes.length();
if (n > 0) {
sendExtendBatch();
sendExtendBarrier();
std::string const progress = "creating " + std::to_string(n) +
" index(es) for " + collectionMsg;
setProgress(progress);
try {
SingleCollectionTransaction trx(
transaction::StandaloneContext::Create(vocbase()),
col->id(),
AccessMode::Type::EXCLUSIVE
);
res = trx.begin();
if (!res.ok()) {
return Result(res.errorNumber(), std::string("unable to start transaction: ") + res.errorMessage());
}
trx.pinData(col->id()); // will throw when it fails
LogicalCollection* document = trx.documentCollection();
TRI_ASSERT(document != nullptr);
auto physical = document->getPhysical();
TRI_ASSERT(physical != nullptr);
for (auto const& idxDef : VPackArrayIterator(indexes)) {
std::shared_ptr<arangodb::Index> idx;
if (idxDef.isObject()) {
VPackSlice const type = idxDef.get("type");
if (type.isString()) {
std::string const progress = "creating index of type " +
type.copyString() + " for " +
collectionMsg;
setProgress(progress);
}
}
res = physical->restoreIndex(&trx, idxDef, idx);
if (!res.ok()) {
res.reset(res.errorNumber(), std::string("could not create index: ") + res.errorMessage());
break;
}
}
if (res.ok()) {
res = trx.commit();
}
} catch (arangodb::basics::Exception const& ex) {
return Result(ex.code(), ex.what());
} catch (std::exception const& ex) {
return Result(TRI_ERROR_INTERNAL, ex.what());
} catch (...) {
return Result(TRI_ERROR_INTERNAL);
}
}
return res;
}
// we won't get here
TRI_ASSERT(false);
return Result(TRI_ERROR_INTERNAL);
}
Result DatabaseInitialSyncer::fetchInventory(VPackBuilder& builder) {
std::string url = ReplicationUrl + "/inventory?serverId=" + _localServerIdString +
"&batchId=" + std::to_string(_batchId);
if (_configuration._includeSystem) {
url += "&includeSystem=true";
}
// send request
std::string const progress = "fetching master inventory from " + url;
setProgress(progress);
std::unique_ptr<SimpleHttpResult> response(_client->retryRequest(rest::RequestType::GET, url, nullptr, 0));
if (hasFailed(response.get())) {
sendFinishBatch();
return buildHttpError(response.get(), url);
}
Result r = parseResponse(builder, response.get());
if (r.fail()) {
return Result(r.errorNumber(), std::string("got invalid response from master at ") +
_masterInfo._endpoint + url + ": invalid response type for initial data. expecting array");
}
VPackSlice const slice = builder.slice();
if (!slice.isObject()) {
LOG_TOPIC(DEBUG, Logger::REPLICATION) << "client: DatabaseInitialSyncer::run - inventoryResponse is not an object";
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE, std::string("got invalid response from master at ") +
_masterInfo._endpoint + url + ": invalid JSON");
}
return Result();
}
/// @brief handle the inventory response of the master
Result DatabaseInitialSyncer::handleLeaderCollections(VPackSlice const& collSlice,
bool incremental) {
TRI_ASSERT(collSlice.isArray());
std::vector<std::pair<VPackSlice, VPackSlice>> collections;
for (VPackSlice it : VPackArrayIterator(collSlice)) {
if (!it.isObject()) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE,
"collection declaration is invalid in response");
}
VPackSlice const parameters = it.get("parameters");
if (!parameters.isObject()) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE,
"collection parameters declaration is invalid in response");
}
VPackSlice const indexes = it.get("indexes");
if (!indexes.isArray()) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE,
"collection indexes declaration is invalid in response");
}
std::string const masterName =
VelocyPackHelper::getStringValue(parameters, "name", "");
if (masterName.empty()) {
return Result(TRI_ERROR_REPLICATION_INVALID_RESPONSE,
"collection name is missing in response");
}
if (TRI_ExcludeCollectionReplication(masterName, _configuration._includeSystem)) {
continue;
}
if (VelocyPackHelper::getBooleanValue(parameters, "deleted", false)) {
// we don't care about deleted collections
continue;
}
if (!_configuration._restrictType.empty()) {
auto const it = _configuration._restrictCollections.find(masterName);
bool found = (it != _configuration._restrictCollections.end());
if (_configuration._restrictType == "include" && !found) {
// collection should not be included
continue;
} else if (_configuration._restrictType == "exclude" && found) {
// collection should be excluded
continue;
}
}
collections.emplace_back(parameters, indexes);
}
// STEP 1: validate collection declarations from master
// ----------------------------------------------------------------------------------
// STEP 2: drop and re-create collections locally if they are also present on
// the master
// ------------------------------------------------------------------------------------
// STEP 3: sync collection data from master and create initial indexes
// ----------------------------------------------------------------------------------
// iterate over all collections from the master...
std::array<sync_phase_e, 3> phases{{ PHASE_VALIDATE, PHASE_DROP_CREATE, PHASE_DUMP }};
for (auto const& phase : phases) {
Result r = iterateCollections(collections, incremental, phase);
if (r.fail()) {
return r;
}
}
return Result();
}
/// @brief iterate over all collections from an array and apply an action
Result DatabaseInitialSyncer::iterateCollections(
std::vector<std::pair<VPackSlice, VPackSlice>> const& collections,
bool incremental, sync_phase_e phase) {
std::string phaseMsg("starting phase " + translatePhase(phase) + " with " +
std::to_string(collections.size()) + " collections");
setProgress(phaseMsg);
for (auto const& collection : collections) {
VPackSlice const parameters = collection.first;
VPackSlice const indexes = collection.second;
Result res = handleCollection(parameters, indexes, incremental, phase);
if (res.fail()) {
return res;
}
}
// all ok
return Result();
}
std::unordered_map<std::string, std::string> DatabaseInitialSyncer::createHeaders() const {
return { {StaticStrings::ClusterCommSource, ServerState::instance()->getId()} };
}
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