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/**
* Copyright (C) 2020-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kReplicationInitialSync
#include "mongo/platform/basic.h"
#include "mongo/db/repl/initial_sync_base_cloner.h"
#include "mongo/db/repl/replication_consistency_markers_gen.h"
#include "mongo/db/repl/replication_consistency_markers_impl.h"
#include "mongo/logv2/log.h"
namespace mongo {
namespace {
MONGO_FAIL_POINT_DEFINE(hangBeforeCheckingRollBackIdClonerStage);
} // namespace
namespace repl {
// These failpoints are shared with initial_syncer and so must not be in the unnamed namespace.
MONGO_FAIL_POINT_DEFINE(initialSyncFuzzerSynchronizationPoint1);
MONGO_FAIL_POINT_DEFINE(initialSyncFuzzerSynchronizationPoint2);
InitialSyncBaseCloner::InitialSyncBaseCloner(StringData clonerName,
InitialSyncSharedData* sharedData,
const HostAndPort& source,
DBClientConnection* client,
StorageInterface* storageInterface,
ThreadPool* dbPool)
: BaseCloner(clonerName, sharedData, source, client, storageInterface, dbPool) {}
void InitialSyncBaseCloner::clearRetryingState() {
_retryableOp = boost::none;
}
void InitialSyncBaseCloner::handleStageAttemptFailed(BaseClonerStage* stage, Status lastError) {
auto isThisStageFailPoint = [this, stage](const BSONObj& data) {
return data["stage"].str() == stage->getName() && isMyFailPoint(data);
};
bool shouldRetry = [&] {
stdx::lock_guard<InitialSyncSharedData> lk(*getSharedData());
return getSharedData()->shouldRetryOperation(lk, &_retryableOp);
}();
if (!shouldRetry) {
auto status = lastError.withContext(
str::stream() << ": Exceeded initialSyncTransientErrorRetryPeriodSeconds "
<< getSharedData()->getAllowedOutageDuration(
stdx::lock_guard<InitialSyncSharedData>(*getSharedData())));
setSyncFailedStatus(status);
uassertStatusOK(status);
}
hangBeforeCheckingRollBackIdClonerStage.executeIf(
[&](const BSONObj& data) {
LOGV2(21076,
"Initial sync cloner {cloner} hanging before checking rollBackId for stage "
"{stage}",
"Initial sync cloner hanging before checking rollBackId",
"cloner"_attr = getClonerName(),
"stage"_attr = stage->getName());
while (!mustExit() &&
hangBeforeCheckingRollBackIdClonerStage.shouldFail(isThisStageFailPoint)) {
sleepmillis(100);
}
},
isThisStageFailPoint);
// This includes checking the sync source member state, checking the rollback ID,
// and checking the sync source initial sync ID.
if (stage->checkSyncSourceValidityOnRetry()) {
// If checkSyncSourceIsStillValid fails without throwing, it means a network
// error occurred and it's safe to continue (which will cause another retry).
if (!checkSyncSourceIsStillValid().isOK())
return;
// After successfully checking the sync source validity, the client should
// always be OK.
invariant(!getClient()->isFailed());
}
}
Status InitialSyncBaseCloner::checkSyncSourceIsStillValid() {
auto status = checkInitialSyncIdIsUnchanged();
if (!status.isOK())
return status;
return checkRollBackIdIsUnchanged();
}
Status InitialSyncBaseCloner::checkInitialSyncIdIsUnchanged() {
BSONObj initialSyncId;
try {
initialSyncId = getClient()->findOne(
NamespaceString{ReplicationConsistencyMarkersImpl::kDefaultInitialSyncIdNamespace},
BSONObj{});
} catch (DBException& e) {
if (ErrorCodes::isRetriableError(e)) {
auto status = e.toStatus().withContext(
": failed while attempting to retrieve initial sync ID after re-connect");
LOGV2_DEBUG(
4608505, 1, "Retrieving Initial Sync ID retriable error", "error"_attr = status);
return status;
}
throw;
}
uassert(ErrorCodes::InitialSyncFailure,
"Cannot retrieve sync source initial sync ID",
!initialSyncId.isEmpty());
InitialSyncIdDocument initialSyncIdDoc =
InitialSyncIdDocument::parse(IDLParserErrorContext("initialSyncId"), initialSyncId);
stdx::lock_guard<ReplSyncSharedData> lk(*getSharedData());
uassert(ErrorCodes::InitialSyncFailure,
"Sync source has been resynced since we started syncing from it",
getSharedData()->getInitialSyncSourceId(lk) == initialSyncIdDoc.get_id());
return Status::OK();
}
Status InitialSyncBaseCloner::checkRollBackIdIsUnchanged() {
BSONObj info;
try {
getClient()->runCommand("admin", BSON("replSetGetRBID" << 1), info);
} catch (DBException& e) {
if (ErrorCodes::isRetriableError(e)) {
static constexpr char errorMsg[] =
"Failed while attempting to retrieve rollBackId after re-connect";
LOGV2_DEBUG(21073, 1, errorMsg, "error"_attr = e);
return e.toStatus().withContext(errorMsg);
}
throw;
}
uassert(
31298, "Sync source returned invalid result from replSetGetRBID", info["rbid"].isNumber());
auto rollBackId = info["rbid"].numberInt();
uassert(ErrorCodes::UnrecoverableRollbackError,
str::stream() << "Rollback occurred on our sync source " << getSource()
<< " during initial sync",
rollBackId == getSharedData()->getRollBackId());
return Status::OK();
}
void InitialSyncBaseCloner::pauseForFuzzer(BaseClonerStage* stage) {
// These are the stages that the initial sync fuzzer expects to be able to pause on using the
// syncronization fail points.
static const auto initialSyncPauseStages =
std::vector<std::string>{"listCollections", "listIndexes", "listDatabases"};
if (MONGO_unlikely(initialSyncFuzzerSynchronizationPoint1.shouldFail())) {
if (std::find(initialSyncPauseStages.begin(),
initialSyncPauseStages.end(),
stage->getName()) != initialSyncPauseStages.end()) {
// These failpoints are set and unset by the InitialSyncTest fixture to cause initial
// sync to pause so that the Initial Sync Fuzzer can run commands on the sync source.
// nb: This log message is specifically checked for in
// initial_sync_test_fixture_test.js, so if you change it here you will need to change
// it there.
LOGV2(21066,
"Collection Cloner scheduled a remote command on the {stage}",
"Collection Cloner scheduled a remote command",
"stage"_attr = describeForFuzzer(stage));
LOGV2(21067, "initialSyncFuzzerSynchronizationPoint1 fail point enabled");
initialSyncFuzzerSynchronizationPoint1.pauseWhileSet();
if (MONGO_unlikely(initialSyncFuzzerSynchronizationPoint2.shouldFail())) {
LOGV2(21068, "initialSyncFuzzerSynchronizationPoint2 fail point enabled");
initialSyncFuzzerSynchronizationPoint2.pauseWhileSet();
}
}
}
}
logv2::LogComponent InitialSyncBaseCloner::getLogComponent() {
return logv2::LogComponent::kReplicationInitialSync;
}
} // namespace repl
} // namespace mongo
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