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arangodb/arangod/Replication/InitialSyncer.cpp

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////////////////////////////////////////////////////////////////////////////////
/// 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 Jan Steemann
////////////////////////////////////////////////////////////////////////////////
#include "InitialSyncer.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 "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 "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 <velocypack/Builder.h>
#include <velocypack/Iterator.h>
#include <velocypack/Slice.h>
#include <velocypack/velocypack-aliases.h>
#include <cstring>
using namespace arangodb;
using namespace arangodb::basics;
using namespace arangodb::httpclient;
using namespace arangodb::rest;
using namespace arangodb::rocksutils;
size_t const InitialSyncer::MaxChunkSize = 10 * 1024 * 1024;
InitialSyncer::InitialSyncer(
TRI_vocbase_t* vocbase,
TRI_replication_applier_configuration_t const* configuration,
std::unordered_map<std::string, bool> const& restrictCollections,
std::string const& restrictType, bool verbose, bool skipCreateDrop)
: Syncer(vocbase, configuration),
_progress("not started"),
_restrictCollections(restrictCollections),
_restrictType(restrictType),
_processedCollections(),
_batchId(0),
_batchUpdateTime(0),
_batchTtl(180),
_includeSystem(false),
_chunkSize(configuration->_chunkSize),
_verbose(verbose),
_hasFlushed(false),
_skipCreateDrop(skipCreateDrop) {
if (_chunkSize == 0) {
_chunkSize = (uint64_t)2 * 1024 * 1024; // 2 mb
} else if (_chunkSize < 128 * 1024) {
_chunkSize = 128 * 1024;
}
_includeSystem = configuration->_includeSystem;
}
InitialSyncer::~InitialSyncer() {
try {
sendFinishBatch();
} catch (...) {
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief run method, performs a full synchronization
////////////////////////////////////////////////////////////////////////////////
int InitialSyncer::run(std::string& errorMsg, bool incremental) {
if (_client == nullptr || _connection == nullptr || _endpoint == nullptr) {
errorMsg = "invalid endpoint";
return TRI_ERROR_INTERNAL;
}
int res = _vocbase->replicationApplier()->preventStart();
if (res != TRI_ERROR_NO_ERROR) {
return res;
}
TRI_DEFER(_vocbase->replicationApplier()->allowStart());
try {
setProgress("fetching master state");
LOG_TOPIC(DEBUG, Logger::REPLICATION) << "client: getting master state";
res = getMasterState(errorMsg);
if (res != TRI_ERROR_NO_ERROR) {
LOG_TOPIC(DEBUG, Logger::REPLICATION)
<< "client: got master state: " << res << " " << errorMsg;
return res;
}
LOG_TOPIC(DEBUG, Logger::REPLICATION)
<< "client: got master state: " << res << " " << errorMsg;
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;
}
}
if (incremental) {
res = sendFlush(errorMsg);
if (res != TRI_ERROR_NO_ERROR) {
return res;
}
}
// create a WAL logfile barrier that prevents WAL logfile collection
sendCreateBarrier(errorMsg, _masterInfo._lastLogTick);
res = sendStartBatch(errorMsg);
if (res != TRI_ERROR_NO_ERROR) {
return res;
}
std::string url = BaseUrl + "/inventory?serverId=" + _localServerIdString +
"&batchId=" + std::to_string(_batchId);
if (_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 (response == nullptr || !response->isComplete()) {
errorMsg = "could not connect to master at " + _masterInfo._endpoint +
": " + _client->getErrorMessage();
sendFinishBatch();
return TRI_ERROR_REPLICATION_NO_RESPONSE;
}
TRI_ASSERT(response != nullptr);
if (response->wasHttpError()) {
res = TRI_ERROR_REPLICATION_MASTER_ERROR;
errorMsg = "got invalid response from master at " +
_masterInfo._endpoint + ": HTTP " +
StringUtils::itoa(response->getHttpReturnCode()) + ": " +
response->getHttpReturnMessage();
} else {
auto builder = std::make_shared<VPackBuilder>();
res = parseResponse(builder, response.get());
if (res != TRI_ERROR_NO_ERROR) {
errorMsg = "got invalid response from master at " +
std::string(_masterInfo._endpoint) +
": invalid response type for initial data. expecting array";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
VPackSlice const slice = builder->slice();
if (!slice.isObject()) {
LOG_TOPIC(DEBUG, Logger::REPLICATION) << "client: InitialSyncer::run - "
"inventoryResponse is not an "
"object";
res = TRI_ERROR_REPLICATION_INVALID_RESPONSE;
errorMsg = "got invalid response from master at " +
_masterInfo._endpoint + ": invalid JSON";
} else {
auto pair = stripObjectIds(slice);
res = handleInventoryResponse(pair.first, incremental, errorMsg);
}
}
sendFinishBatch();
if (res != TRI_ERROR_NO_ERROR && errorMsg.empty()) {
errorMsg = TRI_errno_string(res);
}
return res;
} catch (arangodb::basics::Exception const& ex) {
sendFinishBatch();
errorMsg = ex.what();
return ex.code();
} catch (std::exception const& ex) {
sendFinishBatch();
errorMsg = ex.what();
return TRI_ERROR_INTERNAL;
} catch (...) {
sendFinishBatch();
errorMsg = "an unknown exception occurred";
return TRI_ERROR_NO_ERROR;
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief send a WAL flush command
////////////////////////////////////////////////////////////////////////////////
int InitialSyncer::sendFlush(std::string& errorMsg) {
std::string const url = "/_admin/wal/flush";
std::string const body =
"{\"waitForSync\":true,\"waitForCollector\":true,"
"\"waitForCollectorQueue\":true}";
// send request
std::string const progress = "send 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 (response == nullptr || !response->isComplete()) {
errorMsg = "could not connect to master at " + _masterInfo._endpoint +
": " + _client->getErrorMessage();
return TRI_ERROR_REPLICATION_NO_RESPONSE;
}
TRI_ASSERT(response != nullptr);
if (response->wasHttpError()) {
int res = TRI_ERROR_REPLICATION_MASTER_ERROR;
errorMsg = "got invalid response from master at " + _masterInfo._endpoint +
": HTTP " + StringUtils::itoa(response->getHttpReturnCode()) +
": " + response->getHttpReturnMessage();
return res;
}
_hasFlushed = true;
return TRI_ERROR_NO_ERROR;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief send a "start batch" command
////////////////////////////////////////////////////////////////////////////////
int InitialSyncer::sendStartBatch(std::string& errorMsg) {
_batchId = 0;
std::string const url =
BaseUrl + "/batch" + "?serverId=" + _localServerIdString;
std::string const body = "{\"ttl\":" + StringUtils::itoa(_batchTtl) + "}";
// send request
std::string const progress = "send batch start command to url " + url;
setProgress(progress);
std::unique_ptr<SimpleHttpResult> response(_client->retryRequest(
rest::RequestType::POST, url, body.c_str(), body.size()));
if (response == nullptr || !response->isComplete()) {
errorMsg = "could not connect to master at " + _masterInfo._endpoint +
": " + _client->getErrorMessage();
return TRI_ERROR_REPLICATION_NO_RESPONSE;
}
TRI_ASSERT(response != nullptr);
if (response->wasHttpError()) {
return TRI_ERROR_REPLICATION_MASTER_ERROR;
}
auto builder = std::make_shared<VPackBuilder>();
int res = parseResponse(builder, response.get());
if (res != TRI_ERROR_NO_ERROR) {
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
VPackSlice const slice = builder->slice();
if (!slice.isObject()) {
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
std::string const id = VelocyPackHelper::getStringValue(slice, "id", "");
if (id.empty()) {
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
_batchId = StringUtils::uint64(id);
_batchUpdateTime = TRI_microtime();
return TRI_ERROR_NO_ERROR;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief send an "extend batch" command
////////////////////////////////////////////////////////////////////////////////
int InitialSyncer::sendExtendBatch() {
if (_batchId == 0) {
return TRI_ERROR_NO_ERROR;
}
double now = TRI_microtime();
if (now <= _batchUpdateTime + _batchTtl - 60.0) {
// no need to extend the batch yet
return TRI_ERROR_NO_ERROR;
}
std::string const url = BaseUrl + "/batch/" + StringUtils::itoa(_batchId) +
"?serverId=" + _localServerIdString;
std::string const body = "{\"ttl\":" + StringUtils::itoa(_batchTtl) + "}";
// send request
std::string const progress = "send batch extend command to url " + url;
setProgress(progress);
std::unique_ptr<SimpleHttpResult> response(
_client->request(rest::RequestType::PUT, url, body.c_str(), body.size()));
if (response == nullptr || !response->isComplete()) {
return TRI_ERROR_REPLICATION_NO_RESPONSE;
}
TRI_ASSERT(response != nullptr);
int res = TRI_ERROR_NO_ERROR;
if (response->wasHttpError()) {
res = TRI_ERROR_REPLICATION_MASTER_ERROR;
} else {
_batchUpdateTime = TRI_microtime();
}
return res;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief send a "finish batch" command
////////////////////////////////////////////////////////////////////////////////
int InitialSyncer::sendFinishBatch() {
if (_batchId == 0) {
return TRI_ERROR_NO_ERROR;
}
try {
std::string const url = BaseUrl + "/batch/" + StringUtils::itoa(_batchId) +
"?serverId=" + _localServerIdString;
// send request
std::string const progress = "send batch finish command to url " + url;
setProgress(progress);
std::unique_ptr<SimpleHttpResult> response(
_client->retryRequest(rest::RequestType::DELETE_REQ, url, nullptr, 0));
if (response == nullptr || !response->isComplete()) {
return TRI_ERROR_REPLICATION_NO_RESPONSE;
}
TRI_ASSERT(response != nullptr);
int res = TRI_ERROR_NO_ERROR;
if (response->wasHttpError()) {
res = TRI_ERROR_REPLICATION_MASTER_ERROR;
} else {
_batchId = 0;
_batchUpdateTime = 0;
}
return res;
} catch (...) {
return TRI_ERROR_INTERNAL;
}
}
////////////////////////////////////////////////////////////////////////////////
/// @brief check whether the initial synchronization should be aborted
////////////////////////////////////////////////////////////////////////////////
bool InitialSyncer::checkAborted() {
if (application_features::ApplicationServer::isStopping() ||
(_vocbase->replicationApplier() != nullptr &&
_vocbase->replicationApplier()->stopInitialSynchronization())) {
return true;
}
return false;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief apply the data from a collection dump
////////////////////////////////////////////////////////////////////////////////
int InitialSyncer::applyCollectionDump(transaction::Methods& trx,
std::string const& collectionName,
SimpleHttpResult* response,
uint64_t& markersProcessed,
std::string& errorMsg) {
std::string const invalidMsg =
"received invalid JSON data for collection " + collectionName;
StringBuffer& data = response->getBody();
char const* p = data.begin();
char const* end = p + data.length();
// buffer must end with a NUL byte
TRI_ASSERT(*end == '\0');
auto builder = std::make_shared<VPackBuilder>();
while (p < end) {
char const* q = strchr(p, '\n');
if (q == nullptr) {
q = end;
}
if (q - p < 2) {
// we are done
return TRI_ERROR_NO_ERROR;
}
TRI_ASSERT(q <= end);
try {
builder->clear();
VPackParser parser(builder);
parser.parse(p, static_cast<size_t>(q - p));
} catch (...) {
// TODO: improve error reporting
return TRI_ERROR_OUT_OF_MEMORY;
}
p = q + 1;
VPackSlice const slice = builder->slice();
if (!slice.isObject()) {
errorMsg = invalidMsg;
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
TRI_replication_operation_e type = REPLICATION_INVALID;
std::string key;
std::string rev;
VPackSlice doc;
for (auto const& it : VPackObjectIterator(slice)) {
std::string const attributeName(it.key.copyString());
if (attributeName == "type") {
if (it.value.isNumber()) {
type = static_cast<TRI_replication_operation_e>(
it.value.getNumber<int>());
}
}
else if (attributeName == "data") {
if (it.value.isObject()) {
doc = it.value;
}
}
}
if (!doc.isNone()) {
VPackSlice value = doc.get(StaticStrings::KeyString);
if (value.isString()) {
key = value.copyString();
}
value = doc.get(StaticStrings::RevString);
if (value.isString()) {
rev = value.copyString();
}
}
// key must not be empty, but doc can be empty
if (key.empty()) {
errorMsg = invalidMsg;
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
++markersProcessed;
VPackBuilder oldBuilder;
oldBuilder.openObject();
oldBuilder.add(StaticStrings::KeyString, VPackValue(key));
if (!rev.empty()) {
oldBuilder.add(StaticStrings::RevString, VPackValue(rev));
}
oldBuilder.close();
VPackSlice const old = oldBuilder.slice();
int res = applyCollectionDumpMarker(trx, collectionName, type, old, doc,
errorMsg);
if (res != TRI_ERROR_NO_ERROR) {
return res;
}
}
// reached the end
return TRI_ERROR_NO_ERROR;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief incrementally fetch data from a collection
////////////////////////////////////////////////////////////////////////////////
int InitialSyncer::handleCollectionDump(arangodb::LogicalCollection* col,
std::string const& cid,
std::string const& collectionName,
TRI_voc_tick_t maxTick,
std::string& errorMsg) {
std::string appendix;
if (_hasFlushed) {
appendix = "&flush=false";
} else {
// only flush WAL once
appendix = "&flush=true&flushWait=15";
_hasFlushed = true;
}
uint64_t chunkSize = _chunkSize;
TRI_ASSERT(_batchId); // should not be equal to 0
std::string const baseUrl = BaseUrl + "/dump?collection=" + cid +
"&batchId=" + std::to_string(_batchId) + appendix;
TRI_voc_tick_t fromTick = 0;
int batch = 1;
uint64_t bytesReceived = 0;
uint64_t markersProcessed = 0;
while (true) {
if (checkAborted()) {
return 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(_includeSystem ? "true" : "false");
std::string const typeString =
(col->type() == TRI_COL_TYPE_EDGE ? "edge" : "document");
// send request
std::string const progress =
"fetching master collection dump for collection '" + collectionName +
"', type: " + typeString + ", id " + cid + ", 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["X-Arango-Async"] = "store";
}
std::unique_ptr<SimpleHttpResult> response(_client->retryRequest(
rest::RequestType::GET, url, nullptr, 0, headers));
if (response == nullptr || !response->isComplete()) {
errorMsg = "could not connect to master at " + _masterInfo._endpoint +
": " + _client->getErrorMessage();
return TRI_ERROR_REPLICATION_NO_RESPONSE;
}
TRI_ASSERT(response != nullptr);
if (response->wasHttpError()) {
errorMsg = "got invalid response from master at " +
_masterInfo._endpoint + ": HTTP " +
StringUtils::itoa(response->getHttpReturnCode()) + ": " +
response->getHttpReturnMessage();
return TRI_ERROR_REPLICATION_MASTER_ERROR;
}
// use async mode for first batch
if (batch == 1) {
bool found = false;
std::string jobId =
response->getHeaderField(StaticStrings::AsyncId, found);
if (!found) {
errorMsg = "got invalid response from master at " +
_masterInfo._endpoint +
": could not find 'X-Arango-Async' header";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
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
errorMsg = "job not found on master at " + _masterInfo._endpoint;
return TRI_ERROR_REPLICATION_NO_RESPONSE;
}
}
double waitTime = TRI_microtime() - startTime;
if (static_cast<uint64_t>(waitTime * 1000.0 * 1000.0) >=
_configuration._initialSyncMaxWaitTime) {
errorMsg = "timed out waiting for response from master at " +
_masterInfo._endpoint;
return TRI_ERROR_REPLICATION_NO_RESPONSE;
}
double sleepTime;
if (waitTime < 5.0) {
sleepTime = 0.25;
} else if (waitTime < 20.0) {
sleepTime = 0.5;
} else if (waitTime < 60.0) {
sleepTime = 1.0;
} else {
sleepTime = 2.0;
}
if (checkAborted()) {
return TRI_ERROR_REPLICATION_APPLIER_STOPPED;
}
this->sleep(static_cast<uint64_t>(sleepTime * 1000.0 * 1000.0));
}
// fallthrough here in case everything went well
}
if (response->hasContentLength()) {
bytesReceived += response->getContentLength();
}
Result res;
bool checkMore = false;
bool found;
TRI_voc_tick_t tick;
std::string header =
response->getHeaderField(TRI_REPLICATION_HEADER_CHECKMORE, found);
if (found) {
checkMore = StringUtils::boolean(header);
res = TRI_ERROR_NO_ERROR;
if (checkMore) {
header = response->getHeaderField(TRI_REPLICATION_HEADER_LASTINCLUDED,
found);
if (found) {
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 (!found) {
errorMsg = "got invalid response from master at " +
_masterInfo._endpoint + ": required header is missing";
res.reset(TRI_ERROR_REPLICATION_INVALID_RESPONSE, errorMsg);
}
if (res.ok()) {
SingleCollectionTransaction trx(
transaction::StandaloneContext::Create(_vocbase), col->cid(),
AccessMode::Type::EXCLUSIVE);
res = trx.begin();
if (!res.ok()) {
errorMsg = std::string("unable to start transaction (") + std::string(__FILE__) + std::string(":") + std::to_string(__LINE__) + std::string("): ") + res.errorMessage();
res.reset(res.errorNumber(), errorMsg);
return res.errorNumber();
}
trx.pinData(col->cid()); // will throw when it fails
if (res.ok()) {
res = applyCollectionDump(trx, collectionName, response.get(),
markersProcessed, errorMsg);
res = trx.finish(res.errorNumber());
}
}
if (!res.ok()) {
return res.errorNumber();
}
if (!checkMore || fromTick == 0) {
// done
return res.errorNumber();
}
// increase chunk size for next fetch
if (chunkSize < MaxChunkSize) {
chunkSize = static_cast<uint64_t>(chunkSize * 1.5);
if (chunkSize > MaxChunkSize) {
chunkSize = MaxChunkSize;
}
}
batch++;
}
TRI_ASSERT(false);
return TRI_ERROR_INTERNAL;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief incrementally fetch data from a collection
////////////////////////////////////////////////////////////////////////////////
int InitialSyncer::handleCollectionSync(arangodb::LogicalCollection* col,
std::string const& cid,
std::string const& collectionName,
TRI_voc_tick_t maxTick,
std::string& errorMsg) {
sendExtendBatch();
sendExtendBarrier();
std::string const baseUrl = BaseUrl + "/keys";
std::string url = baseUrl + "?collection=" + cid +
"&to=" + std::to_string(maxTick) +
"&batchId=" + std::to_string(_batchId);
std::string progress = "fetching collection keys for collection '" +
collectionName + "' 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["X-Arango-Async"] = "store";
std::unique_ptr<SimpleHttpResult> response(
_client->retryRequest(rest::RequestType::POST, url, nullptr, 0, headers));
if (response == nullptr || !response->isComplete()) {
errorMsg = "could not connect to master at " + _masterInfo._endpoint +
": " + _client->getErrorMessage();
return TRI_ERROR_REPLICATION_NO_RESPONSE;
}
TRI_ASSERT(response != nullptr);
if (response->wasHttpError()) {
errorMsg = "got invalid response from master at " + _masterInfo._endpoint +
": HTTP " + StringUtils::itoa(response->getHttpReturnCode()) +
": " + response->getHttpReturnMessage();
return TRI_ERROR_REPLICATION_MASTER_ERROR;
}
bool found = false;
std::string jobId = response->getHeaderField(StaticStrings::AsyncId, found);
if (!found) {
errorMsg = "got invalid response from master at " + _masterInfo._endpoint +
": could not find 'X-Arango-Async' header";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
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
errorMsg = "job not found on master at " + _masterInfo._endpoint;
return TRI_ERROR_REPLICATION_NO_RESPONSE;
}
}
double waitTime = TRI_microtime() - startTime;
if (static_cast<uint64_t>(waitTime * 1000.0 * 1000.0) >=
_configuration._initialSyncMaxWaitTime) {
errorMsg = "timed out waiting for response from master at " +
_masterInfo._endpoint;
return TRI_ERROR_REPLICATION_NO_RESPONSE;
}
double sleepTime;
if (waitTime < 5.0) {
sleepTime = 0.25;
} else if (waitTime < 20.0) {
sleepTime = 0.5;
} else if (waitTime < 60.0) {
sleepTime = 1.0;
} else {
sleepTime = 2.0;
}
if (checkAborted()) {
return TRI_ERROR_REPLICATION_APPLIER_STOPPED;
}
this->sleep(static_cast<uint64_t>(sleepTime * 1000.0 * 1000.0));
}
auto builder = std::make_shared<VPackBuilder>();
int res = parseResponse(builder, response.get());
if (res != TRI_ERROR_NO_ERROR) {
errorMsg = "got invalid response from master at " +
std::string(_masterInfo._endpoint) + ": response is no object";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
VPackSlice const slice = builder->slice();
if (!slice.isObject()) {
errorMsg = "got invalid response from master at " + _masterInfo._endpoint +
": response is no object";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
VPackSlice const id = slice.get("id");
if (!id.isString()) {
errorMsg = "got invalid response from master at " + _masterInfo._endpoint +
": response does not contain valid 'id' attribute";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
auto shutdown = [&]() -> void {
url = baseUrl + "/" + id.copyString();
std::string progress =
"deleting remote collection keys object for collection '" +
collectionName + "' 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()) {
errorMsg = "got invalid response from master at " + _masterInfo._endpoint +
": response does not contain valid 'count' attribute";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
if (count.getNumber<size_t>() <= 0) {
// remote collection has no documents. now truncate our local collection
SingleCollectionTransaction trx(
transaction::StandaloneContext::Create(_vocbase), col->cid(),
AccessMode::Type::EXCLUSIVE);
Result res = trx.begin();
if (!res.ok()) {
errorMsg = std::string("unable to start transaction (") + std::string(__FILE__) + std::string(":") + std::to_string(__LINE__) + std::string("): ") + res.errorMessage();
res.reset(res.errorNumber(), errorMsg);
return res.errorNumber();
}
OperationOptions options;
if (!_leaderId.empty()) {
options.isSynchronousReplicationFrom = _leaderId;
}
OperationResult opRes = trx.truncate(collectionName, options);
if (!opRes.successful()) {
errorMsg = "unable to truncate collection '" + collectionName +
"': " + TRI_errno_string(opRes.code);
return opRes.code;
}
res = trx.finish(opRes.code);
return res.errorNumber();
}
// now we can fetch the complete chunk information from the master
try {
res = EngineSelectorFeature::ENGINE->handleSyncKeys(
*this, col, id.copyString(), cid, collectionName, maxTick, errorMsg);
} catch (arangodb::basics::Exception const& ex) {
res = ex.code();
} catch (std::exception const& ex) {
errorMsg = ex.what();
res = TRI_ERROR_INTERNAL;
} catch (...) {
res = TRI_ERROR_INTERNAL;
}
return res;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief incrementally fetch data from a collection
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
/// @brief changes the properties of a collection, based on the VelocyPack
/// provided
////////////////////////////////////////////////////////////////////////////////
int InitialSyncer::changeCollection(arangodb::LogicalCollection* col,
VPackSlice const& slice) {
arangodb::CollectionGuard guard(_vocbase, col->cid());
bool doSync =
application_features::ApplicationServer::getFeature<DatabaseFeature>(
"Database")
->forceSyncProperties();
return guard.collection()->updateProperties(slice, doSync).errorNumber();
}
////////////////////////////////////////////////////////////////////////////////
/// @brief determine the number of documents in a collection
////////////////////////////////////////////////////////////////////////////////
int64_t InitialSyncer::getSize(arangodb::LogicalCollection* col) {
SingleCollectionTransaction trx(
transaction::StandaloneContext::Create(_vocbase), col->cid(),
AccessMode::Type::READ);
Result res = trx.begin();
if (!res.ok()) {
return -1;
}
auto document = trx.documentCollection();
return static_cast<int64_t>(document->numberDocuments(&trx));
}
////////////////////////////////////////////////////////////////////////////////
/// @brief handle the information about a collection
////////////////////////////////////////////////////////////////////////////////
int InitialSyncer::handleCollection(VPackSlice const& parameters,
VPackSlice const& indexes, bool incremental,
std::string& errorMsg, sync_phase_e phase) {
if (checkAborted()) {
return TRI_ERROR_REPLICATION_APPLIER_STOPPED;
}
if (!parameters.isObject() || !indexes.isArray()) {
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
sendExtendBatch();
sendExtendBarrier();
std::string const masterName =
VelocyPackHelper::getStringValue(parameters, "name", "");
TRI_voc_cid_t const cid = VelocyPackHelper::extractIdValue(parameters);
if (cid == 0) {
errorMsg = "collection id is missing in response";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
VPackSlice const type = parameters.get("type");
if (!type.isNumber()) {
errorMsg = "collection type is missing in response";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
std::string const typeString =
(type.getNumber<int>() == 3 ? "edge" : "document");
std::string const collectionMsg = "collection '" + masterName + "', type " +
typeString + ", id " +
StringUtils::itoa(cid);
// phase handling
if (phase == PHASE_VALIDATE) {
// validation phase just returns ok if we got here (aborts above if data is
// invalid)
_processedCollections.emplace(cid, masterName);
return TRI_ERROR_NO_ERROR;
}
// drop and re-create collections locally
// -------------------------------------------------------------------------------------
if (phase == PHASE_DROP_CREATE) {
if (!incremental) {
// first look up the collection by the cid
arangodb::LogicalCollection* col =
getCollectionByIdOrName(cid, masterName);
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->cid(),
AccessMode::Type::EXCLUSIVE);
Result res = trx.begin();
if (!res.ok()) {
errorMsg = "unable to truncate " + collectionMsg + ": " +
res.errorMessage();
res.reset(res.errorNumber(), errorMsg);
return res.errorNumber();
}
OperationOptions options;
if (!_leaderId.empty()) {
options.isSynchronousReplicationFrom = _leaderId;
}
OperationResult opRes = trx.truncate(col->name(), options);
if (!opRes.successful()) {
errorMsg = "unable to truncate " + collectionMsg + ": " +
TRI_errno_string(opRes.code);
return opRes.code;
}
res = trx.finish(opRes.code);
if (!res.ok()) {
errorMsg = "unable to truncate " + collectionMsg + ": " +
res.errorMessage();
return res.errorNumber();
}
} else {
// regular collection
if (_skipCreateDrop) {
setProgress("dropping " + collectionMsg + " skipped because of configuration");
return TRI_ERROR_NO_ERROR;
}
setProgress("dropping " + collectionMsg);
int res = _vocbase->dropCollection(col, true, -1.0);
if (res != TRI_ERROR_NO_ERROR) {
errorMsg = "unable to drop " + collectionMsg + ": " +
TRI_errno_string(res);
return res;
}
}
}
}
arangodb::LogicalCollection* col = nullptr;
if (incremental) {
col = getCollectionByIdOrName(cid, masterName);
if (col != nullptr) {
// collection is already present
std::string const progress =
"checking/changing parameters of " + collectionMsg;
setProgress(progress.c_str());
return changeCollection(col, parameters);
}
}
std::string progress = "creating " + collectionMsg;
if (_skipCreateDrop) {
progress += " skipped because of configuration";
setProgress(progress.c_str());
return TRI_ERROR_NO_ERROR;
}
setProgress(progress.c_str());
int res = createCollection(parameters, &col);
if (res != TRI_ERROR_NO_ERROR) {
errorMsg =
"unable to create " + collectionMsg + ": " + TRI_errno_string(res);
return res;
}
return TRI_ERROR_NO_ERROR;
}
// sync collection data
// -------------------------------------------------------------------------------------
else if (phase == PHASE_DUMP) {
std::string const progress = "dumping data for " + collectionMsg;
setProgress(progress.c_str());
arangodb::LogicalCollection* col = getCollectionByIdOrName(cid, masterName);
if (col == nullptr) {
errorMsg = "cannot dump: " + collectionMsg + " not found";
return TRI_ERROR_ARANGO_COLLECTION_NOT_FOUND;
}
Result res;
{
READ_LOCKER(readLocker, _vocbase->_inventoryLock);
if (incremental && getSize(col) > 0) {
res = handleCollectionSync(col, StringUtils::itoa(cid), masterName,
_masterInfo._lastLogTick, errorMsg);
} else {
res = handleCollectionDump(col, StringUtils::itoa(cid), masterName,
_masterInfo._lastLogTick, errorMsg);
}
if (res.ok()) {
// 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->cid(),
AccessMode::Type::EXCLUSIVE);
res = trx.begin();
if (!res.ok()) {
errorMsg = std::string("unable to start transaction (") + std::string(__FILE__) + std::string(":") + std::to_string(__LINE__) + std::string("): ") + res.errorMessage();
res.reset(res.errorNumber(), errorMsg);
return res.errorNumber();
}
trx.pinData(col->cid()); // 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()) {
errorMsg = "could not create index: " + res.errorMessage();
res.reset(res.errorNumber(), errorMsg);
break;
}
}
res = trx.finish(res);
} catch (arangodb::basics::Exception const& ex) {
res = ex.code();
} catch (...) {
res = TRI_ERROR_INTERNAL;
}
}
}
}
return res.errorNumber();
}
// we won't get here
TRI_ASSERT(false);
return TRI_ERROR_INTERNAL;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief handle the inventory response of the master
////////////////////////////////////////////////////////////////////////////////
int InitialSyncer::handleInventoryResponse(VPackSlice const& slice,
bool incremental,
std::string& errorMsg) {
VPackSlice const data = slice.get("collections");
if (!data.isArray()) {
errorMsg = "collections section is missing from response";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
std::vector<std::pair<VPackSlice, VPackSlice>> collections;
for (auto const& it : VPackArrayIterator(data)) {
if (!it.isObject()) {
errorMsg = "collection declaration is invalid in response";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
VPackSlice const parameters = it.get("parameters");
if (!parameters.isObject()) {
errorMsg = "collection parameters declaration is invalid in response";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
VPackSlice const indexes = it.get("indexes");
if (!indexes.isArray()) {
errorMsg = "collection indexes declaration is invalid in response";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
std::string const masterName =
VelocyPackHelper::getStringValue(parameters, "name", "");
if (masterName.empty()) {
errorMsg = "collection name is missing in response";
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
}
if (TRI_ExcludeCollectionReplication(masterName.c_str(), _includeSystem)) {
continue;
}
if (VelocyPackHelper::getBooleanValue(parameters, "deleted", false)) {
// we don't care about deleted collections
continue;
}
if (!_restrictType.empty()) {
auto const it = _restrictCollections.find(masterName);
bool found = (it != _restrictCollections.end());
if (_restrictType == "include" && !found) {
// collection should not be included
continue;
} else if (_restrictType == "exclude" && found) {
// collection should be excluded
continue;
}
}
collections.emplace_back(parameters, indexes);
}
int res;
// STEP 1: validate collection declarations from master
// ----------------------------------------------------------------------------------
// iterate over all collections from the master...
res = iterateCollections(collections, incremental, errorMsg, PHASE_VALIDATE);
if (res != TRI_ERROR_NO_ERROR) {
return res;
}
// STEP 2: drop and re-create collections locally if they are also present on
// the master
// ------------------------------------------------------------------------------------
res =
iterateCollections(collections, incremental, errorMsg, PHASE_DROP_CREATE);
if (res != TRI_ERROR_NO_ERROR) {
return res;
}
// STEP 3: sync collection data from master and create initial indexes
// ----------------------------------------------------------------------------------
return iterateCollections(collections, incremental, errorMsg, PHASE_DUMP);
}
////////////////////////////////////////////////////////////////////////////////
/// @brief iterate over all collections from an array and apply an action
////////////////////////////////////////////////////////////////////////////////
int InitialSyncer::iterateCollections(
std::vector<std::pair<VPackSlice, VPackSlice>> const& collections,
bool incremental, std::string& errorMsg, 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;
errorMsg = "";
int res =
handleCollection(parameters, indexes, incremental, errorMsg, phase);
if (res != TRI_ERROR_NO_ERROR) {
return res;
}
}
// all ok
return TRI_ERROR_NO_ERROR;
}
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