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/**
* Copyright (C) 2016 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::kSharding
#include "mongo/platform/basic.h"
#include "mongo/db/s/balancer/balancer.h"
#include <algorithm>
#include <string>
#include "mongo/base/status_with.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/client/read_preference.h"
#include "mongo/db/client.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/s/balancer/balancer_chunk_selection_policy_impl.h"
#include "mongo/db/s/balancer/cluster_statistics_impl.h"
#include "mongo/s/balancer_configuration.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/catalog/type_chunk.h"
#include "mongo/s/client/shard.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/cluster_identity_loader.h"
#include "mongo/s/grid.h"
#include "mongo/s/shard_util.h"
#include "mongo/s/sharding_raii.h"
#include "mongo/stdx/memory.h"
#include "mongo/util/exit.h"
#include "mongo/util/log.h"
#include "mongo/util/timer.h"
#include "mongo/util/version.h"
namespace mongo {
using std::map;
using std::string;
using std::vector;
namespace {
const Seconds kBalanceRoundDefaultInterval(10);
// Sleep between balancer rounds in the case where the last round found some chunks which needed to
// be balanced. This value should be set sufficiently low so that imbalanced clusters will quickly
// reach balanced state, but setting it too low may cause CRUD operations to start failing due to
// not being able to establish a stable shard version.
const Seconds kShortBalanceRoundInterval(1);
const auto getBalancer = ServiceContext::declareDecoration<std::unique_ptr<Balancer>>();
/**
* Utility class to generate timing and statistics for a single balancer round.
*/
class BalanceRoundDetails {
public:
BalanceRoundDetails() : _executionTimer() {}
void setSucceeded(int candidateChunks, int chunksMoved) {
invariant(!_errMsg);
_candidateChunks = candidateChunks;
_chunksMoved = chunksMoved;
}
void setFailed(const string& errMsg) {
_errMsg = errMsg;
}
BSONObj toBSON() const {
BSONObjBuilder builder;
builder.append("executionTimeMillis", _executionTimer.millis());
builder.append("errorOccured", _errMsg.is_initialized());
if (_errMsg) {
builder.append("errmsg", *_errMsg);
} else {
builder.append("candidateChunks", _candidateChunks);
builder.append("chunksMoved", _chunksMoved);
}
return builder.obj();
}
private:
const Timer _executionTimer;
// Set only on success
int _candidateChunks{0};
int _chunksMoved{0};
// Set only on failure
boost::optional<string> _errMsg;
};
/**
* Occasionally prints a log message with shard versions if the versions are not the same
* in the cluster.
*/
void warnOnMultiVersion(const vector<ClusterStatistics::ShardStatistics>& clusterStats) {
auto&& vii = VersionInfoInterface::instance();
bool isMultiVersion = false;
for (const auto& stat : clusterStats) {
if (!vii.isSameMajorVersion(stat.mongoVersion.c_str())) {
isMultiVersion = true;
break;
}
}
// If we're all the same version, don't message
if (!isMultiVersion)
return;
StringBuilder sb;
sb << "Multi version cluster detected. Local version: " << vii.version()
<< ", shard versions: ";
for (const auto& stat : clusterStats) {
sb << stat.shardId << " is at " << stat.mongoVersion << "; ";
}
warning() << sb.str();
}
} // namespace
Balancer::Balancer(ServiceContext* serviceContext)
: _balancedLastTime(0),
_clusterStats(stdx::make_unique<ClusterStatisticsImpl>()),
_chunkSelectionPolicy(
stdx::make_unique<BalancerChunkSelectionPolicyImpl>(_clusterStats.get())),
_migrationManager(serviceContext) {}
Balancer::~Balancer() {
// The balancer thread must have been stopped
stdx::lock_guard<stdx::mutex> scopedLock(_mutex);
invariant(_state == kStopped);
}
void Balancer::create(ServiceContext* serviceContext) {
invariant(!getBalancer(serviceContext));
getBalancer(serviceContext) = stdx::make_unique<Balancer>(serviceContext);
// Register a shutdown task to terminate the balancer thread so that it doesn't leak memory.
registerShutdownTask([serviceContext] {
auto balancer = Balancer::get(serviceContext);
// Make sure that the balancer thread has been interrupted.
balancer->interruptBalancer();
// Make sure the balancer thread has terminated.
balancer->waitForBalancerToStop();
});
}
Balancer* Balancer::get(ServiceContext* serviceContext) {
return getBalancer(serviceContext).get();
}
Balancer* Balancer::get(OperationContext* operationContext) {
return get(operationContext->getServiceContext());
}
void Balancer::initiateBalancer(OperationContext* opCtx) {
stdx::lock_guard<stdx::mutex> scopedLock(_mutex);
invariant(_state == kStopped);
_state = kRunning;
_migrationManager.startRecoveryAndAcquireDistLocks(opCtx);
invariant(!_thread.joinable());
invariant(!_threadOperationContext);
_thread = stdx::thread([this] { _mainThread(); });
}
void Balancer::interruptBalancer() {
stdx::lock_guard<stdx::mutex> scopedLock(_mutex);
if (_state != kRunning)
return;
_state = kStopping;
// Interrupt the balancer thread if it has been started. We are guaranteed that the operation
// context of that thread is still alive, because we hold the balancer mutex.
if (_threadOperationContext) {
stdx::lock_guard<Client> scopedClientLock(*_threadOperationContext->getClient());
_threadOperationContext->markKilled(ErrorCodes::InterruptedDueToReplStateChange);
}
// Schedule a separate thread to shutdown the migration manager in order to avoid deadlock with
// replication step down
invariant(!_migrationManagerInterruptThread.joinable());
_migrationManagerInterruptThread =
stdx::thread([this] { _migrationManager.interruptAndDisableMigrations(); });
_condVar.notify_all();
}
void Balancer::waitForBalancerToStop() {
{
stdx::lock_guard<stdx::mutex> scopedLock(_mutex);
if (_state == kStopped)
return;
invariant(_state == kStopping);
invariant(_thread.joinable());
}
_thread.join();
stdx::lock_guard<stdx::mutex> scopedLock(_mutex);
_state = kStopped;
_thread = {};
LOG(1) << "Balancer thread terminated";
}
void Balancer::joinCurrentRound(OperationContext* opCtx) {
stdx::unique_lock<stdx::mutex> scopedLock(_mutex);
const auto numRoundsAtStart = _numBalancerRounds;
_condVar.wait(scopedLock,
[&] { return !_inBalancerRound || _numBalancerRounds != numRoundsAtStart; });
}
Status Balancer::rebalanceSingleChunk(OperationContext* opCtx, const ChunkType& chunk) {
auto migrateStatus = _chunkSelectionPolicy->selectSpecificChunkToMove(opCtx, chunk);
if (!migrateStatus.isOK()) {
return migrateStatus.getStatus();
}
auto migrateInfo = std::move(migrateStatus.getValue());
if (!migrateInfo) {
LOG(1) << "Unable to find more appropriate location for chunk " << redact(chunk.toString());
return Status::OK();
}
auto balancerConfig = Grid::get(opCtx)->getBalancerConfiguration();
Status refreshStatus = balancerConfig->refreshAndCheck(opCtx);
if (!refreshStatus.isOK()) {
return refreshStatus;
}
return _migrationManager.executeManualMigration(opCtx,
*migrateInfo,
balancerConfig->getMaxChunkSizeBytes(),
balancerConfig->getSecondaryThrottle(),
balancerConfig->waitForDelete());
}
Status Balancer::moveSingleChunk(OperationContext* opCtx,
const ChunkType& chunk,
const ShardId& newShardId,
uint64_t maxChunkSizeBytes,
const MigrationSecondaryThrottleOptions& secondaryThrottle,
bool waitForDelete) {
auto moveAllowedStatus = _chunkSelectionPolicy->checkMoveAllowed(opCtx, chunk, newShardId);
if (!moveAllowedStatus.isOK()) {
return moveAllowedStatus;
}
return _migrationManager.executeManualMigration(
opCtx, MigrateInfo(newShardId, chunk), maxChunkSizeBytes, secondaryThrottle, waitForDelete);
}
void Balancer::report(OperationContext* opCtx, BSONObjBuilder* builder) {
auto balancerConfig = Grid::get(opCtx)->getBalancerConfiguration();
balancerConfig->refreshAndCheck(opCtx);
const auto mode = balancerConfig->getBalancerMode();
stdx::lock_guard<stdx::mutex> scopedLock(_mutex);
builder->append("mode", BalancerSettingsType::kBalancerModes[mode]);
builder->append("inBalancerRound", _inBalancerRound);
builder->append("numBalancerRounds", _numBalancerRounds);
}
void Balancer::_mainThread() {
Client::initThread("Balancer");
auto opCtx = cc().makeOperationContext();
auto shardingContext = Grid::get(opCtx.get());
log() << "CSRS balancer is starting";
{
stdx::lock_guard<stdx::mutex> scopedLock(_mutex);
_threadOperationContext = opCtx.get();
}
const Seconds kInitBackoffInterval(10);
auto balancerConfig = shardingContext->getBalancerConfiguration();
while (!_stopRequested()) {
Status refreshStatus = balancerConfig->refreshAndCheck(opCtx.get());
if (!refreshStatus.isOK()) {
warning() << "Balancer settings could not be loaded and will be retried in "
<< durationCount<Seconds>(kInitBackoffInterval) << " seconds"
<< causedBy(refreshStatus);
_sleepFor(opCtx.get(), kInitBackoffInterval);
continue;
}
break;
}
log() << "CSRS balancer thread is recovering";
_migrationManager.finishRecovery(opCtx.get(),
balancerConfig->getMaxChunkSizeBytes(),
balancerConfig->getSecondaryThrottle());
log() << "CSRS balancer thread is recovered";
// Main balancer loop
while (!_stopRequested()) {
BalanceRoundDetails roundDetails;
_beginRound(opCtx.get());
try {
shardingContext->shardRegistry()->reload(opCtx.get());
uassert(13258, "oids broken after resetting!", _checkOIDs(opCtx.get()));
Status refreshStatus = balancerConfig->refreshAndCheck(opCtx.get());
if (!refreshStatus.isOK()) {
warning() << "Skipping balancing round" << causedBy(refreshStatus);
_endRound(opCtx.get(), kBalanceRoundDefaultInterval);
continue;
}
if (!balancerConfig->shouldBalance()) {
LOG(1) << "Skipping balancing round because balancing is disabled";
_endRound(opCtx.get(), kBalanceRoundDefaultInterval);
continue;
}
{
LOG(1) << "*** start balancing round. "
<< "waitForDelete: " << balancerConfig->waitForDelete()
<< ", secondaryThrottle: "
<< balancerConfig->getSecondaryThrottle().toBSON();
OCCASIONALLY warnOnMultiVersion(
uassertStatusOK(_clusterStats->getStats(opCtx.get())));
Status status = _enforceTagRanges(opCtx.get());
if (!status.isOK()) {
warning() << "Failed to enforce tag ranges" << causedBy(status);
} else {
LOG(1) << "Done enforcing tag range boundaries.";
}
const auto candidateChunks = uassertStatusOK(
_chunkSelectionPolicy->selectChunksToMove(opCtx.get(), _balancedLastTime));
if (candidateChunks.empty()) {
LOG(1) << "no need to move any chunk";
_balancedLastTime = false;
} else {
_balancedLastTime = _moveChunks(opCtx.get(), candidateChunks);
roundDetails.setSucceeded(static_cast<int>(candidateChunks.size()),
_balancedLastTime);
shardingContext->catalogClient(opCtx.get())
->logAction(opCtx.get(), "balancer.round", "", roundDetails.toBSON());
}
LOG(1) << "*** End of balancing round";
}
_endRound(opCtx.get(),
_balancedLastTime ? kShortBalanceRoundInterval
: kBalanceRoundDefaultInterval);
} catch (const std::exception& e) {
log() << "caught exception while doing balance: " << e.what();
// Just to match the opening statement if in log level 1
LOG(1) << "*** End of balancing round";
// This round failed, tell the world!
roundDetails.setFailed(e.what());
shardingContext->catalogClient(opCtx.get())
->logAction(opCtx.get(), "balancer.round", "", roundDetails.toBSON());
// Sleep a fair amount before retrying because of the error
_endRound(opCtx.get(), kBalanceRoundDefaultInterval);
}
}
{
stdx::lock_guard<stdx::mutex> scopedLock(_mutex);
invariant(_state == kStopping);
invariant(_migrationManagerInterruptThread.joinable());
}
_migrationManagerInterruptThread.join();
_migrationManager.drainActiveMigrations();
{
stdx::lock_guard<stdx::mutex> scopedLock(_mutex);
_migrationManagerInterruptThread = {};
_threadOperationContext = nullptr;
}
log() << "CSRS balancer is now stopped";
}
bool Balancer::_stopRequested() {
stdx::lock_guard<stdx::mutex> scopedLock(_mutex);
return (_state != kRunning);
}
void Balancer::_beginRound(OperationContext* opCtx) {
stdx::unique_lock<stdx::mutex> lock(_mutex);
_inBalancerRound = true;
_condVar.notify_all();
}
void Balancer::_endRound(OperationContext* opCtx, Seconds waitTimeout) {
{
stdx::lock_guard<stdx::mutex> lock(_mutex);
_inBalancerRound = false;
_numBalancerRounds++;
_condVar.notify_all();
}
_sleepFor(opCtx, waitTimeout);
}
void Balancer::_sleepFor(OperationContext* opCtx, Seconds waitTimeout) {
stdx::unique_lock<stdx::mutex> lock(_mutex);
_condVar.wait_for(lock, waitTimeout.toSystemDuration(), [&] { return _state != kRunning; });
}
bool Balancer::_checkOIDs(OperationContext* opCtx) {
auto shardingContext = Grid::get(opCtx);
vector<ShardId> all;
shardingContext->shardRegistry()->getAllShardIds(&all);
// map of OID machine ID => shardId
map<int, ShardId> oids;
for (const ShardId& shardId : all) {
if (_stopRequested()) {
return false;
}
auto shardStatus = shardingContext->shardRegistry()->getShard(opCtx, shardId);
if (!shardStatus.isOK()) {
continue;
}
const auto s = shardStatus.getValue();
auto result = uassertStatusOK(
s->runCommandWithFixedRetryAttempts(opCtx,
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
"admin",
BSON("features" << 1),
Shard::RetryPolicy::kIdempotent));
uassertStatusOK(result.commandStatus);
BSONObj f = std::move(result.response);
if (f["oidMachine"].isNumber()) {
int x = f["oidMachine"].numberInt();
if (oids.count(x) == 0) {
oids[x] = shardId;
} else {
log() << "error: 2 machines have " << x << " as oid machine piece: " << shardId
<< " and " << oids[x];
result = uassertStatusOK(s->runCommandWithFixedRetryAttempts(
opCtx,
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
"admin",
BSON("features" << 1 << "oidReset" << 1),
Shard::RetryPolicy::kIdempotent));
uassertStatusOK(result.commandStatus);
auto otherShardStatus = shardingContext->shardRegistry()->getShard(opCtx, oids[x]);
if (otherShardStatus.isOK()) {
result = uassertStatusOK(
otherShardStatus.getValue()->runCommandWithFixedRetryAttempts(
opCtx,
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
"admin",
BSON("features" << 1 << "oidReset" << 1),
Shard::RetryPolicy::kIdempotent));
uassertStatusOK(result.commandStatus);
}
return false;
}
} else {
log() << "warning: oidMachine not set on: " << s->toString();
}
}
return true;
}
Status Balancer::_enforceTagRanges(OperationContext* opCtx) {
auto chunksToSplitStatus = _chunkSelectionPolicy->selectChunksToSplit(opCtx);
if (!chunksToSplitStatus.isOK()) {
return chunksToSplitStatus.getStatus();
}
for (const auto& splitInfo : chunksToSplitStatus.getValue()) {
auto scopedCMStatus = ScopedChunkManager::refreshAndGet(opCtx, splitInfo.nss);
if (!scopedCMStatus.isOK()) {
return scopedCMStatus.getStatus();
}
const auto& scopedCM = scopedCMStatus.getValue();
auto splitStatus =
shardutil::splitChunkAtMultiplePoints(opCtx,
splitInfo.shardId,
splitInfo.nss,
scopedCM.cm()->getShardKeyPattern(),
splitInfo.collectionVersion,
ChunkRange(splitInfo.minKey, splitInfo.maxKey),
splitInfo.splitKeys);
if (!splitStatus.isOK()) {
warning() << "Failed to enforce tag range for chunk " << redact(splitInfo.toString())
<< causedBy(redact(splitStatus.getStatus()));
}
}
return Status::OK();
}
int Balancer::_moveChunks(OperationContext* opCtx,
const BalancerChunkSelectionPolicy::MigrateInfoVector& candidateChunks) {
auto balancerConfig = Grid::get(opCtx)->getBalancerConfiguration();
// If the balancer was disabled since we started this round, don't start new chunk moves
if (_stopRequested() || !balancerConfig->shouldBalance()) {
LOG(1) << "Skipping balancing round because balancer was stopped";
return 0;
}
auto migrationStatuses =
_migrationManager.executeMigrationsForAutoBalance(opCtx,
candidateChunks,
balancerConfig->getMaxChunkSizeBytes(),
balancerConfig->getSecondaryThrottle(),
balancerConfig->waitForDelete());
int numChunksProcessed = 0;
for (const auto& migrationStatusEntry : migrationStatuses) {
const Status& status = migrationStatusEntry.second;
if (status.isOK()) {
numChunksProcessed++;
continue;
}
const MigrationIdentifier& migrationId = migrationStatusEntry.first;
const auto requestIt = std::find_if(candidateChunks.begin(),
candidateChunks.end(),
[&migrationId](const MigrateInfo& migrateInfo) {
return migrateInfo.getName() == migrationId;
});
invariant(requestIt != candidateChunks.end());
if (status == ErrorCodes::ChunkTooBig) {
numChunksProcessed++;
log() << "Performing a split because migration " << redact(requestIt->toString())
<< " failed for size reasons" << causedBy(redact(status));
_splitOrMarkJumbo(opCtx, NamespaceString(requestIt->ns), requestIt->minKey);
continue;
}
log() << "Balancer move " << redact(requestIt->toString()) << " failed"
<< causedBy(redact(status));
}
return numChunksProcessed;
}
void Balancer::_splitOrMarkJumbo(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& minKey) {
auto scopedCM = uassertStatusOK(ScopedChunkManager::refreshAndGet(opCtx, nss));
const auto cm = scopedCM.cm().get();
auto chunk = cm->findIntersectingChunkWithSimpleCollation(minKey);
try {
const auto splitPoints = uassertStatusOK(shardutil::selectChunkSplitPoints(
opCtx,
chunk->getShardId(),
nss,
cm->getShardKeyPattern(),
ChunkRange(chunk->getMin(), chunk->getMax()),
Grid::get(opCtx)->getBalancerConfiguration()->getMaxChunkSizeBytes(),
boost::none));
uassert(ErrorCodes::CannotSplit, "No split points found", !splitPoints.empty());
uassertStatusOK(
shardutil::splitChunkAtMultiplePoints(opCtx,
chunk->getShardId(),
nss,
cm->getShardKeyPattern(),
cm->getVersion(),
ChunkRange(chunk->getMin(), chunk->getMax()),
splitPoints));
} catch (const DBException& ex) {
log() << "Marking chunk " << redact(chunk->toString()) << " as jumbo.";
chunk->markAsJumbo();
const std::string chunkName = ChunkType::genID(nss.ns(), chunk->getMin());
auto status = Grid::get(opCtx)->catalogClient(opCtx)->updateConfigDocument(
opCtx,
ChunkType::ConfigNS,
BSON(ChunkType::name(chunkName)),
BSON("$set" << BSON(ChunkType::jumbo(true))),
false,
ShardingCatalogClient::kMajorityWriteConcern);
if (!status.isOK()) {
log() << "Couldn't set jumbo for chunk: " << redact(chunkName)
<< causedBy(redact(status.getStatus()));
}
}
}
} // namespace mongo
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