/
replication_coordinator_impl.cpp
2499 lines (2209 loc) · 102 KB
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replication_coordinator_impl.cpp
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/**
* Copyright (C) 2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/repl/replication_coordinator_impl.h"
#include <algorithm>
#include <boost/thread.hpp>
#include "mongo/base/status.h"
#include "mongo/db/concurrency/d_concurrency.h"
#include "mongo/db/global_timestamp.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/operation_context_noop.h"
#include "mongo/db/repl/check_quorum_for_config_change.h"
#include "mongo/db/repl/elect_cmd_runner.h"
#include "mongo/db/repl/freshness_checker.h"
#include "mongo/db/repl/handshake_args.h"
#include "mongo/db/repl/is_master_response.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/repl/repl_set_declare_election_winner_args.h"
#include "mongo/db/repl/repl_set_heartbeat_args.h"
#include "mongo/db/repl/repl_set_heartbeat_response.h"
#include "mongo/db/repl/repl_set_html_summary.h"
#include "mongo/db/repl/repl_set_request_votes_args.h"
#include "mongo/db/repl/repl_settings.h"
#include "mongo/db/repl/replica_set_config_checks.h"
#include "mongo/db/repl/replication_executor.h"
#include "mongo/db/repl/rslog.h"
#include "mongo/db/repl/topology_coordinator.h"
#include "mongo/db/repl/update_position_args.h"
#include "mongo/db/server_options.h"
#include "mongo/db/write_concern_options.h"
#include "mongo/stdx/functional.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
#include "mongo/util/scopeguard.h"
#include "mongo/util/time_support.h"
#include "mongo/util/timer.h"
namespace mongo {
namespace repl {
namespace {
typedef StatusWith<ReplicationExecutor::CallbackHandle> CBHStatus;
void lockAndCall(boost::unique_lock<boost::mutex>* lk, const stdx::function<void ()>& fn) {
if (!lk->owns_lock()) {
lk->lock();
}
fn();
}
/**
* Implements the force-reconfig behavior of incrementing config version by a large random
* number.
*/
BSONObj incrementConfigVersionByRandom(BSONObj config) {
BSONObjBuilder builder;
for (BSONObjIterator iter(config); iter.more(); iter.next()) {
BSONElement elem = *iter;
if (elem.fieldNameStringData() == ReplicaSetConfig::kVersionFieldName &&
elem.isNumber()) {
boost::scoped_ptr<SecureRandom> generator(SecureRandom::create());
const int random = std::abs(static_cast<int>(generator->nextInt64()) % 100000);
builder.appendIntOrLL(ReplicaSetConfig::kVersionFieldName,
elem.numberLong() + 10000 + random);
}
else {
builder.append(elem);
}
}
return builder.obj();
}
} //namespace
struct ReplicationCoordinatorImpl::WaiterInfo {
/**
* Constructor takes the list of waiters and enqueues itself on the list, removing itself
* in the destructor.
*/
WaiterInfo(std::vector<WaiterInfo*>* _list,
unsigned int _opID,
const Timestamp* _opTime,
const WriteConcernOptions* _writeConcern,
boost::condition_variable* _condVar) : list(_list),
master(true),
opID(_opID),
opTime(_opTime),
writeConcern(_writeConcern),
condVar(_condVar) {
list->push_back(this);
}
~WaiterInfo() {
list->erase(std::remove(list->begin(), list->end(), this), list->end());
}
std::vector<WaiterInfo*>* list;
bool master; // Set to false to indicate that stepDown was called while waiting
const unsigned int opID;
const Timestamp* opTime;
const WriteConcernOptions* writeConcern;
boost::condition_variable* condVar;
};
namespace {
ReplicationCoordinator::Mode getReplicationModeFromSettings(const ReplSettings& settings) {
if (settings.usingReplSets()) {
return ReplicationCoordinator::modeReplSet;
}
if (settings.master || settings.slave) {
return ReplicationCoordinator::modeMasterSlave;
}
return ReplicationCoordinator::modeNone;
}
} // namespace
ReplicationCoordinatorImpl::ReplicationCoordinatorImpl(
const ReplSettings& settings,
ReplicationCoordinatorExternalState* externalState,
TopologyCoordinator* topCoord,
int64_t prngSeed,
ReplicationExecutor::NetworkInterface* network,
ReplicationExecutor* replExec) :
_settings(settings),
_replMode(getReplicationModeFromSettings(settings)),
_topCoord(topCoord),
_replExecutorIfOwned(replExec ? nullptr :
new ReplicationExecutor(network, prngSeed)),
_replExecutor(replExec ? *replExec : *_replExecutorIfOwned),
_externalState(externalState),
_inShutdown(false),
_memberState(MemberState::RS_STARTUP),
_isWaitingForDrainToComplete(false),
_rsConfigState(kConfigPreStart),
_selfIndex(-1),
_sleptLastElection(false),
_canAcceptNonLocalWrites(!(settings.usingReplSets() || settings.slave)),
_canServeNonLocalReads(0U),
_dr(DataReplicatorOptions(), &_replExecutor, this) {
if (!isReplEnabled()) {
return;
}
boost::scoped_ptr<SecureRandom> rbidGenerator(SecureRandom::create());
_rbid = static_cast<int>(rbidGenerator->nextInt64());
if (_rbid < 0) {
// Ensure _rbid is always positive
_rbid = -_rbid;
}
// Make sure there is always an entry in _slaveInfo for ourself.
SlaveInfo selfInfo;
selfInfo.self = true;
_slaveInfo.push_back(selfInfo);
}
ReplicationCoordinatorImpl::ReplicationCoordinatorImpl(
const ReplSettings& settings,
ReplicationCoordinatorExternalState* externalState,
ReplicationExecutor::NetworkInterface* network,
TopologyCoordinator* topCoord,
int64_t prngSeed) : ReplicationCoordinatorImpl(settings,
externalState,
topCoord,
prngSeed,
network,
nullptr) { }
ReplicationCoordinatorImpl::ReplicationCoordinatorImpl(
const ReplSettings& settings,
ReplicationCoordinatorExternalState* externalState,
TopologyCoordinator* topCoord,
ReplicationExecutor* replExec,
int64_t prngSeed) : ReplicationCoordinatorImpl(settings,
externalState,
topCoord,
prngSeed,
nullptr,
replExec) { }
ReplicationCoordinatorImpl::~ReplicationCoordinatorImpl() {}
void ReplicationCoordinatorImpl::waitForStartUpComplete() {
boost::unique_lock<boost::mutex> lk(_mutex);
while (_rsConfigState == kConfigPreStart || _rsConfigState == kConfigStartingUp) {
_rsConfigStateChange.wait(lk);
}
}
ReplicaSetConfig ReplicationCoordinatorImpl::getReplicaSetConfig_forTest() {
boost::lock_guard<boost::mutex> lk(_mutex);
return _rsConfig;
}
bool ReplicationCoordinatorImpl::_startLoadLocalConfig(OperationContext* txn) {
StatusWith<BSONObj> cfg = _externalState->loadLocalConfigDocument(txn);
if (!cfg.isOK()) {
log() << "Did not find local replica set configuration document at startup; " <<
cfg.getStatus();
return true;
}
ReplicaSetConfig localConfig;
Status status = localConfig.initialize(cfg.getValue());
if (!status.isOK()) {
error() << "Locally stored replica set configuration does not parse; See "
"http://www.mongodb.org/dochub/core/recover-replica-set-from-invalid-config "
"for information on how to recover from this. Got \"" <<
status << "\" while parsing " << cfg.getValue();
fassertFailedNoTrace(28545);
}
StatusWith<Timestamp> lastOpTimeStatus = _externalState->loadLastOpTime(txn);
// Use a callback here, because _finishLoadLocalConfig calls isself() which requires
// that the server's networking layer be up and running and accepting connections, which
// doesn't happen until startReplication finishes.
_replExecutor.scheduleWork(
stdx::bind(&ReplicationCoordinatorImpl::_finishLoadLocalConfig,
this,
stdx::placeholders::_1,
localConfig,
lastOpTimeStatus));
return false;
}
void ReplicationCoordinatorImpl::_finishLoadLocalConfig(
const ReplicationExecutor::CallbackData& cbData,
const ReplicaSetConfig& localConfig,
const StatusWith<Timestamp>& lastOpTimeStatus) {
if (!cbData.status.isOK()) {
LOG(1) << "Loading local replica set configuration failed due to " << cbData.status;
return;
}
StatusWith<int> myIndex = validateConfigForStartUp(_externalState.get(),
_rsConfig,
localConfig);
if (!myIndex.isOK()) {
if (myIndex.getStatus() == ErrorCodes::NodeNotFound ||
myIndex.getStatus() == ErrorCodes::DuplicateKey) {
warning() << "Locally stored replica set configuration does not have a valid entry "
"for the current node; waiting for reconfig or remote heartbeat; Got \"" <<
myIndex.getStatus() << "\" while validating " << localConfig.toBSON();
myIndex = StatusWith<int>(-1);
}
else {
error() << "Locally stored replica set configuration is invalid; See "
"http://www.mongodb.org/dochub/core/recover-replica-set-from-invalid-config"
" for information on how to recover from this. Got \"" <<
myIndex.getStatus() << "\" while validating " << localConfig.toBSON();
fassertFailedNoTrace(28544);
}
}
if (localConfig.getReplSetName() != _settings.ourSetName()) {
warning() << "Local replica set configuration document reports set name of " <<
localConfig.getReplSetName() << ", but command line reports " <<
_settings.ourSetName() << "; waitng for reconfig or remote heartbeat";
myIndex = StatusWith<int>(-1);
}
// Do not check optime, if this node is an arbiter.
bool isArbiter = myIndex.getValue() != -1 &&
localConfig.getMemberAt(myIndex.getValue()).isArbiter();
Timestamp lastOpTime(0, 0);
if (!isArbiter) {
if (!lastOpTimeStatus.isOK()) {
warning() << "Failed to load timestamp of most recently applied operation; " <<
lastOpTimeStatus.getStatus();
}
else {
lastOpTime = lastOpTimeStatus.getValue();
}
}
boost::unique_lock<boost::mutex> lk(_mutex);
invariant(_rsConfigState == kConfigStartingUp);
const PostMemberStateUpdateAction action =
_setCurrentRSConfig_inlock(localConfig, myIndex.getValue());
_setMyLastOptime_inlock(&lk, lastOpTime, false);
_externalState->setGlobalTimestamp(lastOpTime);
if (lk.owns_lock()) {
lk.unlock();
}
_performPostMemberStateUpdateAction(action);
_externalState->startThreads();
}
void ReplicationCoordinatorImpl::startReplication(OperationContext* txn) {
if (!isReplEnabled()) {
boost::lock_guard<boost::mutex> lk(_mutex);
_setConfigState_inlock(kConfigReplicationDisabled);
return;
}
{
OID rid = _externalState->ensureMe(txn);
boost::lock_guard<boost::mutex> lk(_mutex);
fassert(18822, !_inShutdown);
_setConfigState_inlock(kConfigStartingUp);
_myRID = rid;
_slaveInfo[_getMyIndexInSlaveInfo_inlock()].rid = rid;
}
if (!_settings.usingReplSets()) {
// Must be Master/Slave
invariant(_settings.master || _settings.slave);
_externalState->startMasterSlave(txn);
return;
}
_topCoordDriverThread.reset(new boost::thread(stdx::bind(&ReplicationExecutor::run,
&_replExecutor)));
bool doneLoadingConfig = _startLoadLocalConfig(txn);
if (doneLoadingConfig) {
// If we're not done loading the config, then the config state will be set by
// _finishLoadLocalConfig.
boost::lock_guard<boost::mutex> lk(_mutex);
invariant(!_rsConfig.isInitialized());
_setConfigState_inlock(kConfigUninitialized);
}
}
void ReplicationCoordinatorImpl::shutdown() {
// Shutdown must:
// * prevent new threads from blocking in awaitReplication
// * wake up all existing threads blocking in awaitReplication
// * tell the ReplicationExecutor to shut down
// * wait for the thread running the ReplicationExecutor to finish
if (!_settings.usingReplSets()) {
return;
}
boost::thread* hbReconfigThread = NULL;
{
boost::lock_guard<boost::mutex> lk(_mutex);
fassert(28533, !_inShutdown);
_inShutdown = true;
if (_rsConfigState == kConfigPreStart) {
warning() << "ReplicationCoordinatorImpl::shutdown() called before "
"startReplication() finished. Shutting down without cleaning up the "
"replication system";
return;
}
fassert(18823, _rsConfigState != kConfigStartingUp);
for (std::vector<WaiterInfo*>::iterator it = _replicationWaiterList.begin();
it != _replicationWaiterList.end(); ++it) {
WaiterInfo* waiter = *it;
waiter->condVar->notify_all();
}
// Since we've set _inShutdown we know that _heartbeatReconfigThread will not be
// changed again, which makes it safe to store the pointer to it to be accessed outside
// of _mutex.
hbReconfigThread = _heartbeatReconfigThread.get();
}
if (hbReconfigThread) {
hbReconfigThread->join();
}
_replExecutor.shutdown();
_topCoordDriverThread->join(); // must happen outside _mutex
_externalState->shutdown();
}
const ReplSettings& ReplicationCoordinatorImpl::getSettings() const {
return _settings;
}
ReplicationCoordinator::Mode ReplicationCoordinatorImpl::getReplicationMode() const {
return _replMode;
}
MemberState ReplicationCoordinatorImpl::getMemberState() const {
boost::lock_guard<boost::mutex> lk(_mutex);
return _getMemberState_inlock();
}
MemberState ReplicationCoordinatorImpl::_getMemberState_inlock() const {
return _memberState;
}
Seconds ReplicationCoordinatorImpl::getSlaveDelaySecs() const {
boost::lock_guard<boost::mutex> lk(_mutex);
invariant(_rsConfig.isInitialized());
uassert(28524,
"Node not a member of the current set configuration",
_selfIndex != -1);
return _rsConfig.getMemberAt(_selfIndex).getSlaveDelay();
}
void ReplicationCoordinatorImpl::clearSyncSourceBlacklist() {
CBHStatus cbh = _replExecutor.scheduleWork(
stdx::bind(&ReplicationCoordinatorImpl::_clearSyncSourceBlacklist_finish,
this,
stdx::placeholders::_1));
if (cbh.getStatus() == ErrorCodes::ShutdownInProgress) {
return;
}
fassert(18907, cbh.getStatus());
_replExecutor.wait(cbh.getValue());
}
void ReplicationCoordinatorImpl::_clearSyncSourceBlacklist_finish(
const ReplicationExecutor::CallbackData& cbData) {
if (cbData.status == ErrorCodes::CallbackCanceled)
return;
_topCoord->clearSyncSourceBlacklist();
}
bool ReplicationCoordinatorImpl::setFollowerMode(const MemberState& newState) {
StatusWith<ReplicationExecutor::EventHandle> finishedSettingFollowerState =
_replExecutor.makeEvent();
if (finishedSettingFollowerState.getStatus() == ErrorCodes::ShutdownInProgress) {
return false;
}
fassert(18812, finishedSettingFollowerState.getStatus());
bool success = false;
CBHStatus cbh = _replExecutor.scheduleWork(
stdx::bind(&ReplicationCoordinatorImpl::_setFollowerModeFinish,
this,
stdx::placeholders::_1,
newState,
finishedSettingFollowerState.getValue(),
&success));
if (cbh.getStatus() == ErrorCodes::ShutdownInProgress) {
return false;
}
fassert(18699, cbh.getStatus());
_replExecutor.waitForEvent(finishedSettingFollowerState.getValue());
return success;
}
void ReplicationCoordinatorImpl::_setFollowerModeFinish(
const ReplicationExecutor::CallbackData& cbData,
const MemberState& newState,
const ReplicationExecutor::EventHandle& finishedSettingFollowerMode,
bool* success) {
if (cbData.status == ErrorCodes::CallbackCanceled) {
return;
}
if (newState == _topCoord->getMemberState()) {
*success = true;
_replExecutor.signalEvent(finishedSettingFollowerMode);
return;
}
if (_topCoord->getRole() == TopologyCoordinator::Role::leader) {
*success = false;
_replExecutor.signalEvent(finishedSettingFollowerMode);
return;
}
if (_topCoord->getRole() == TopologyCoordinator::Role::candidate) {
// We are a candidate, which means _topCoord believs us to be in state RS_SECONDARY, and
// we know that newState != RS_SECONDARY because we would have returned early, above if
// the old and new state were equal. So, cancel the running election and try again to
// finish setting the follower mode.
invariant(_freshnessChecker);
_freshnessChecker->cancel(&_replExecutor);
if (_electCmdRunner) {
_electCmdRunner->cancel(&_replExecutor);
}
_replExecutor.onEvent(
_electionFinishedEvent,
stdx::bind(&ReplicationCoordinatorImpl::_setFollowerModeFinish,
this,
stdx::placeholders::_1,
newState,
finishedSettingFollowerMode,
success));
return;
}
boost::unique_lock<boost::mutex> lk(_mutex);
_topCoord->setFollowerMode(newState.s);
const PostMemberStateUpdateAction action =
_updateMemberStateFromTopologyCoordinator_inlock();
*success = true;
_replExecutor.signalEvent(finishedSettingFollowerMode);
lk.unlock();
_performPostMemberStateUpdateAction(action);
}
bool ReplicationCoordinatorImpl::isWaitingForApplierToDrain() {
boost::lock_guard<boost::mutex> lk(_mutex);
return _isWaitingForDrainToComplete;
}
void ReplicationCoordinatorImpl::signalDrainComplete(OperationContext* txn) {
// This logic is a little complicated in order to avoid acquiring the global exclusive lock
// unnecessarily. This is important because the applier may call signalDrainComplete()
// whenever it wants, not only when the ReplicationCoordinator is expecting it.
//
// The steps are:
// 1.) Check to see if we're waiting for this signal. If not, return early.
// 2.) Otherwise, release the mutex while acquiring the global exclusive lock,
// since that might take a while (NB there's a deadlock cycle otherwise, too).
// 3.) Re-check to see if we've somehow left drain mode. If we have not, clear
// _isWaitingForDrainToComplete, set the flag allowing non-local database writes and
// drop the mutex. At this point, no writes can occur from other threads, due to the
// global exclusive lock.
// 4.) Drop all temp collections.
// 5.) Drop the global exclusive lock.
//
// Because replicatable writes are forbidden while in drain mode, and we don't exit drain
// mode until we have the global exclusive lock, which forbids all other threads from making
// writes, we know that from the time that _isWaitingForDrainToComplete is set in
// _performPostMemberStateUpdateAction(kActionWinElection) until this method returns, no
// external writes will be processed. This is important so that a new temp collection isn't
// introduced on the new primary before we drop all the temp collections.
boost::unique_lock<boost::mutex> lk(_mutex);
if (!_isWaitingForDrainToComplete) {
return;
}
lk.unlock();
ScopedTransaction transaction(txn, MODE_X);
Lock::GlobalWrite globalWriteLock(txn->lockState());
lk.lock();
if (!_isWaitingForDrainToComplete) {
return;
}
_isWaitingForDrainToComplete = false;
_canAcceptNonLocalWrites = true;
lk.unlock();
_externalState->dropAllTempCollections(txn);
log() << "transition to primary complete; database writes are now permitted" << rsLog;
}
void ReplicationCoordinatorImpl::signalUpstreamUpdater() {
_externalState->forwardSlaveProgress();
}
ReplicationCoordinatorImpl::SlaveInfo*
ReplicationCoordinatorImpl::_findSlaveInfoByMemberID_inlock(int memberId) {
for (SlaveInfoVector::iterator it = _slaveInfo.begin(); it != _slaveInfo.end(); ++it) {
if (it->memberId == memberId) {
return &(*it);
}
}
return NULL;
}
ReplicationCoordinatorImpl::SlaveInfo*
ReplicationCoordinatorImpl::_findSlaveInfoByRID_inlock(const OID& rid) {
for (SlaveInfoVector::iterator it = _slaveInfo.begin(); it != _slaveInfo.end(); ++it) {
if (it->rid == rid) {
return &(*it);
}
}
return NULL;
}
void ReplicationCoordinatorImpl::_addSlaveInfo_inlock(const SlaveInfo& slaveInfo) {
invariant(getReplicationMode() == modeMasterSlave);
_slaveInfo.push_back(slaveInfo);
// Wake up any threads waiting for replication that now have their replication
// check satisfied
_wakeReadyWaiters_inlock();
}
void ReplicationCoordinatorImpl::_updateSlaveInfoOptime_inlock(SlaveInfo* slaveInfo,
Timestamp ts) {
slaveInfo->opTime = ts;
// Wake up any threads waiting for replication that now have their replication
// check satisfied
_wakeReadyWaiters_inlock();
}
void ReplicationCoordinatorImpl::_updateSlaveInfoFromConfig_inlock() {
invariant(_settings.usingReplSets());
SlaveInfoVector oldSlaveInfos;
_slaveInfo.swap(oldSlaveInfos);
if (_selfIndex == -1) {
// If we aren't in the config then the only data we care about is for ourself
for (SlaveInfoVector::const_iterator it = oldSlaveInfos.begin();
it != oldSlaveInfos.end(); ++it) {
if (it->self) {
SlaveInfo slaveInfo = *it;
slaveInfo.memberId = -1;
_slaveInfo.push_back(slaveInfo);
return;
}
}
invariant(false); // There should always have been an entry for ourself
}
for (int i = 0; i < _rsConfig.getNumMembers(); ++i) {
const MemberConfig& memberConfig = _rsConfig.getMemberAt(i);
int memberId = memberConfig.getId();
const HostAndPort& memberHostAndPort = memberConfig.getHostAndPort();
SlaveInfo slaveInfo;
// Check if the node existed with the same member ID and hostname in the old data
for (SlaveInfoVector::const_iterator it = oldSlaveInfos.begin();
it != oldSlaveInfos.end(); ++it) {
if ((it->memberId == memberId && it->hostAndPort == memberHostAndPort)
|| (i == _selfIndex && it->self)) {
slaveInfo = *it;
}
}
// Make sure you have the most up-to-date info for member ID and hostAndPort.
slaveInfo.memberId = memberId;
slaveInfo.hostAndPort = memberHostAndPort;
_slaveInfo.push_back(slaveInfo);
}
invariant(static_cast<int>(_slaveInfo.size()) == _rsConfig.getNumMembers());
}
size_t ReplicationCoordinatorImpl::_getMyIndexInSlaveInfo_inlock() const {
if (getReplicationMode() == modeMasterSlave) {
// Self data always lives in the first entry in _slaveInfo for master/slave
return 0;
}
else {
invariant(_settings.usingReplSets());
if (_selfIndex == -1) {
invariant(_slaveInfo.size() == 1);
return 0;
}
else {
return _selfIndex;
}
}
}
Status ReplicationCoordinatorImpl::setLastOptimeForSlave(const OID& rid,
const Timestamp& ts) {
boost::unique_lock<boost::mutex> lock(_mutex);
massert(28576,
"Received an old style replication progress update, which is only used for Master/"
"Slave replication now, but this node is not using Master/Slave replication. "
"This is likely caused by an old (pre-2.6) member syncing from this node.",
getReplicationMode() == modeMasterSlave);
SlaveInfo* slaveInfo = _findSlaveInfoByRID_inlock(rid);
if (slaveInfo) {
if (slaveInfo->opTime < ts) {
_updateSlaveInfoOptime_inlock(slaveInfo, ts);
}
}
else {
SlaveInfo newSlaveInfo;
newSlaveInfo.rid = rid;
newSlaveInfo.opTime = ts;
_addSlaveInfo_inlock(newSlaveInfo);
}
return Status::OK();
}
void ReplicationCoordinatorImpl::setMyHeartbeatMessage(const std::string& msg) {
CBHStatus cbh = _replExecutor.scheduleWork(
stdx::bind(&TopologyCoordinator::setMyHeartbeatMessage,
_topCoord.get(),
_replExecutor.now(),
msg));
if (cbh.getStatus() == ErrorCodes::ShutdownInProgress) {
return;
}
fassert(28540, cbh.getStatus());
_replExecutor.wait(cbh.getValue());
}
void ReplicationCoordinatorImpl::setMyLastOptime(const Timestamp& ts) {
boost::unique_lock<boost::mutex> lock(_mutex);
_setMyLastOptime_inlock(&lock, ts, false);
}
void ReplicationCoordinatorImpl::resetMyLastOptime() {
boost::unique_lock<boost::mutex> lock(_mutex);
_setMyLastOptime_inlock(&lock, Timestamp(), true);
}
void ReplicationCoordinatorImpl::_setMyLastOptime_inlock(
boost::unique_lock<boost::mutex>* lock, const Timestamp& ts, bool isRollbackAllowed) {
invariant(lock->owns_lock());
SlaveInfo* mySlaveInfo = &_slaveInfo[_getMyIndexInSlaveInfo_inlock()];
invariant(isRollbackAllowed || mySlaveInfo->opTime <= ts);
_updateSlaveInfoOptime_inlock(mySlaveInfo, ts);
if (getReplicationMode() != modeReplSet) {
return;
}
if (_getMemberState_inlock().primary()) {
return;
}
lock->unlock();
_externalState->forwardSlaveProgress(); // Must do this outside _mutex
}
Timestamp ReplicationCoordinatorImpl::getMyLastOptime() const {
boost::lock_guard<boost::mutex> lock(_mutex);
return _getMyLastOptime_inlock();
}
Timestamp ReplicationCoordinatorImpl::_getMyLastOptime_inlock() const {
return _slaveInfo[_getMyIndexInSlaveInfo_inlock()].opTime;
}
Status ReplicationCoordinatorImpl::setLastOptime_forTest(long long cfgVer,
long long memberId,
const Timestamp& ts) {
boost::lock_guard<boost::mutex> lock(_mutex);
invariant(getReplicationMode() == modeReplSet);
const UpdatePositionArgs::UpdateInfo update(OID(), ts, cfgVer, memberId);
long long configVersion;
return _setLastOptime_inlock(update, &configVersion);
}
Status ReplicationCoordinatorImpl::_setLastOptime_inlock(
const UpdatePositionArgs::UpdateInfo& args, long long* configVersion) {
if (_selfIndex == -1) {
// Ignore updates when we're in state REMOVED
return Status(ErrorCodes::NotMasterOrSecondaryCode,
"Received replSetUpdatePosition command but we are in state REMOVED");
}
invariant(getReplicationMode() == modeReplSet);
if (args.memberId < 0) {
std::string errmsg = str::stream()
<< "Received replSetUpdatePosition for node with memberId "
<< args.memberId << " which is negative and therefore invalid";
LOG(1) << errmsg;
return Status(ErrorCodes::NodeNotFound, errmsg);
}
if (args.rid == _getMyRID_inlock() ||
args.memberId == _rsConfig.getMemberAt(_selfIndex).getId()) {
// Do not let remote nodes tell us what our optime is.
return Status::OK();
}
LOG(2) << "received notification that node with memberID " << args.memberId <<
" in config with version " << args.cfgver << " has reached optime: " << args.ts;
SlaveInfo* slaveInfo = NULL;
if (args.cfgver != _rsConfig.getConfigVersion()) {
std::string errmsg = str::stream()
<< "Received replSetUpdatePosition for node with memberId "
<< args.memberId << " whose config version of " << args.cfgver
<< " doesn't match our config version of "
<< _rsConfig.getConfigVersion();
LOG(1) << errmsg;
*configVersion = _rsConfig.getConfigVersion();
return Status(ErrorCodes::InvalidReplicaSetConfig, errmsg);
}
slaveInfo = _findSlaveInfoByMemberID_inlock(args.memberId);
if (!slaveInfo) {
invariant(!_rsConfig.findMemberByID(args.memberId));
std::string errmsg = str::stream()
<< "Received replSetUpdatePosition for node with memberId "
<< args.memberId << " which doesn't exist in our config";
LOG(1) << errmsg;
return Status(ErrorCodes::NodeNotFound, errmsg);
}
invariant(args.memberId == slaveInfo->memberId);
LOG(3) << "Node with memberID " << args.memberId << " currently has optime " <<
slaveInfo->opTime << "; updating to " << args.ts;
// Only update remote optimes if they increase.
if (slaveInfo->opTime < args.ts) {
_updateSlaveInfoOptime_inlock(slaveInfo, args.ts);
}
_updateLastCommittedOpTime_inlock();
return Status::OK();
}
void ReplicationCoordinatorImpl::interrupt(unsigned opId) {
boost::lock_guard<boost::mutex> lk(_mutex);
for (std::vector<WaiterInfo*>::iterator it = _replicationWaiterList.begin();
it != _replicationWaiterList.end(); ++it) {
WaiterInfo* info = *it;
if (info->opID == opId) {
info->condVar->notify_all();
return;
}
}
_replExecutor.scheduleWork(
stdx::bind(&ReplicationCoordinatorImpl::_signalStepDownWaitersFromCallback,
this,
stdx::placeholders::_1));
}
void ReplicationCoordinatorImpl::interruptAll() {
boost::lock_guard<boost::mutex> lk(_mutex);
for (std::vector<WaiterInfo*>::iterator it = _replicationWaiterList.begin();
it != _replicationWaiterList.end(); ++it) {
WaiterInfo* info = *it;
info->condVar->notify_all();
}
_replExecutor.scheduleWork(
stdx::bind(&ReplicationCoordinatorImpl::_signalStepDownWaitersFromCallback,
this,
stdx::placeholders::_1));
}
bool ReplicationCoordinatorImpl::_doneWaitingForReplication_inlock(
const Timestamp& opTime, const WriteConcernOptions& writeConcern) {
Status status = _checkIfWriteConcernCanBeSatisfied_inlock(writeConcern);
if (!status.isOK()) {
return true;
}
if (!writeConcern.wMode.empty()) {
StringData patternName;
if (writeConcern.wMode == WriteConcernOptions::kMajority) {
patternName = ReplicaSetConfig::kMajorityWriteConcernModeName;
}
else {
patternName = writeConcern.wMode;
}
StatusWith<ReplicaSetTagPattern> tagPattern =
_rsConfig.findCustomWriteMode(patternName);
if (!tagPattern.isOK()) {
return true;
}
return _haveTaggedNodesReachedOpTime_inlock(opTime, tagPattern.getValue());
}
else {
return _haveNumNodesReachedOpTime_inlock(opTime, writeConcern.wNumNodes);
}
}
bool ReplicationCoordinatorImpl::_haveNumNodesReachedOpTime_inlock(const Timestamp& opTime,
int numNodes) {
if (_getMyLastOptime_inlock() < opTime) {
// Secondaries that are for some reason ahead of us should not allow us to
// satisfy a write concern if we aren't caught up ourselves.
return false;
}
for (SlaveInfoVector::iterator it = _slaveInfo.begin();
it != _slaveInfo.end(); ++it) {
const Timestamp& slaveTime = it->opTime;
if (slaveTime >= opTime) {
--numNodes;
}
if (numNodes <= 0) {
return true;
}
}
return false;
}
bool ReplicationCoordinatorImpl::_haveTaggedNodesReachedOpTime_inlock(
const Timestamp& opTime, const ReplicaSetTagPattern& tagPattern) {
ReplicaSetTagMatch matcher(tagPattern);
for (SlaveInfoVector::iterator it = _slaveInfo.begin();
it != _slaveInfo.end(); ++it) {
const Timestamp& slaveTime = it->opTime;
if (slaveTime >= opTime) {
// This node has reached the desired optime, now we need to check if it is a part
// of the tagPattern.
const MemberConfig* memberConfig = _rsConfig.findMemberByID(it->memberId);
invariant(memberConfig);
for (MemberConfig::TagIterator it = memberConfig->tagsBegin();
it != memberConfig->tagsEnd(); ++it) {
if (matcher.update(*it)) {
return true;
}
}
}
}
return false;
}
ReplicationCoordinator::StatusAndDuration ReplicationCoordinatorImpl::awaitReplication(
const OperationContext* txn,
const Timestamp& opTime,
const WriteConcernOptions& writeConcern) {
Timer timer;
boost::unique_lock<boost::mutex> lock(_mutex);
return _awaitReplication_inlock(&timer, &lock, txn, opTime, writeConcern);
}
ReplicationCoordinator::StatusAndDuration
ReplicationCoordinatorImpl::awaitReplicationOfLastOpForClient(
const OperationContext* txn,
const WriteConcernOptions& writeConcern) {
Timer timer;
boost::unique_lock<boost::mutex> lock(_mutex);
return _awaitReplication_inlock(
&timer,
&lock,
txn,
ReplClientInfo::forClient(txn->getClient()).getLastOp(),
writeConcern);
}
ReplicationCoordinator::StatusAndDuration ReplicationCoordinatorImpl::_awaitReplication_inlock(
const Timer* timer,
boost::unique_lock<boost::mutex>* lock,
const OperationContext* txn,
const Timestamp& opTime,
const WriteConcernOptions& writeConcern) {
const Mode replMode = getReplicationMode();
if (replMode == modeNone || serverGlobalParams.configsvr) {
// no replication check needed (validated above)
return StatusAndDuration(Status::OK(), Milliseconds(timer->millis()));
}
if (replMode == modeMasterSlave && writeConcern.wMode == WriteConcernOptions::kMajority) {
// with master/slave, majority is equivalent to w=1
return StatusAndDuration(Status::OK(), Milliseconds(timer->millis()));
}
if (opTime.isNull()) {
// If waiting for the empty optime, always say it's been replicated.
return StatusAndDuration(Status::OK(), Milliseconds(timer->millis()));
}
if (replMode == modeReplSet && !_memberState.primary()) {
return StatusAndDuration(Status(ErrorCodes::NotMaster,
"Not master while waiting for replication"),
Milliseconds(timer->millis()));
}
if (writeConcern.wMode.empty()) {
if (writeConcern.wNumNodes < 1) {
return StatusAndDuration(Status::OK(), Milliseconds(timer->millis()));
}
else if (writeConcern.wNumNodes == 1 && _getMyLastOptime_inlock() >= opTime) {
return StatusAndDuration(Status::OK(), Milliseconds(timer->millis()));
}
}
// Must hold _mutex before constructing waitInfo as it will modify _replicationWaiterList
boost::condition_variable condVar;
WaiterInfo waitInfo(
&_replicationWaiterList, txn->getOpID(), &opTime, &writeConcern, &condVar);
while (!_doneWaitingForReplication_inlock(opTime, writeConcern)) {
const int elapsed = timer->millis();
Status interruptedStatus = txn->checkForInterruptNoAssert();
if (!interruptedStatus.isOK()) {
return StatusAndDuration(interruptedStatus, Milliseconds(elapsed));
}
if (!waitInfo.master) {