/
index_builds_coordinator.cpp
2512 lines (2194 loc) · 115 KB
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index_builds_coordinator.cpp
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/**
* Copyright (C) 2018-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::kStorage
#include "mongo/platform/basic.h"
#include "mongo/db/index_builds_coordinator.h"
#include "mongo/db/catalog/collection_catalog.h"
#include "mongo/db/catalog/commit_quorum_options.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/catalog/index_build_entry_gen.h"
#include "mongo/db/catalog/index_timestamp_helper.h"
#include "mongo/db/catalog/uncommitted_collections.h"
#include "mongo/db/catalog_raii.h"
#include "mongo/db/concurrency/locker.h"
#include "mongo/db/concurrency/replication_state_transition_lock_guard.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/curop.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/index/wildcard_key_generator.h"
#include "mongo/db/index_build_entry_helpers.h"
#include "mongo/db/op_observer.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/member_state.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/repl/timestamp_block.h"
#include "mongo/db/s/collection_sharding_state.h"
#include "mongo/db/s/database_sharding_state.h"
#include "mongo/db/server_options.h"
#include "mongo/db/server_recovery.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/durable_catalog.h"
#include "mongo/logv2/log.h"
#include "mongo/s/shard_key_pattern.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/str.h"
namespace mongo {
using namespace indexbuildentryhelpers;
MONGO_FAIL_POINT_DEFINE(hangAfterIndexBuildFirstDrain);
MONGO_FAIL_POINT_DEFINE(hangAfterIndexBuildSecondDrain);
MONGO_FAIL_POINT_DEFINE(hangAfterIndexBuildDumpsInsertsFromBulk);
MONGO_FAIL_POINT_DEFINE(hangAfterInitializingIndexBuild);
MONGO_FAIL_POINT_DEFINE(failIndexBuildOnCommit);
namespace {
constexpr StringData kCreateIndexesFieldName = "createIndexes"_sd;
constexpr StringData kCommitIndexBuildFieldName = "commitIndexBuild"_sd;
constexpr StringData kAbortIndexBuildFieldName = "abortIndexBuild"_sd;
constexpr StringData kIndexesFieldName = "indexes"_sd;
constexpr StringData kKeyFieldName = "key"_sd;
constexpr StringData kUniqueFieldName = "unique"_sd;
/**
* Checks if unique index specification is compatible with sharding configuration.
*/
void checkShardKeyRestrictions(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& newIdxKey) {
UncommittedCollections::get(opCtx).invariantHasExclusiveAccessToCollection(opCtx, nss);
const auto collDesc = CollectionShardingState::get(opCtx, nss)->getCollectionDescription();
if (!collDesc.isSharded())
return;
const ShardKeyPattern shardKeyPattern(collDesc.getKeyPattern());
uassert(ErrorCodes::CannotCreateIndex,
str::stream() << "cannot create unique index over " << newIdxKey
<< " with shard key pattern " << shardKeyPattern.toBSON(),
shardKeyPattern.isUniqueIndexCompatible(newIdxKey));
}
/**
* Returns true if we should build the indexes an empty collection using the IndexCatalog and
* bypass the index build registration.
*/
bool shouldBuildIndexesOnEmptyCollectionSinglePhased(OperationContext* opCtx,
Collection* collection,
IndexBuildProtocol protocol) {
const auto& nss = collection->ns();
invariant(opCtx->lockState()->isCollectionLockedForMode(nss, MODE_X), str::stream() << nss);
auto replCoord = repl::ReplicationCoordinator::get(opCtx);
// Check whether the replica set member's config has {buildIndexes:false} set, which means
// we are not allowed to build non-_id indexes on this server.
if (!replCoord->buildsIndexes()) {
return false;
}
// Secondaries should not bypass index build registration (and _runIndexBuild()) for two phase
// index builds because they need to report index build progress to the primary per commit
// quorum.
if (IndexBuildProtocol::kTwoPhase == protocol && replCoord->getSettings().usingReplSets() &&
!replCoord->canAcceptWritesFor(opCtx, nss)) {
return false;
}
// We use the fast count information, through Collection::numRecords(), to determine if the
// collection is empty. However, this information is either unavailable or inaccurate when the
// node is in certain replication states, such as recovery or rollback. In these cases, we
// have to build the index by scanning the collection.
auto memberState = replCoord->getMemberState();
if (memberState.rollback()) {
return false;
}
if (inReplicationRecovery(opCtx->getServiceContext())) {
return false;
}
// Now, it's fine to trust Collection::isEmpty().
// Fast counts are prone to both false positives and false negatives on unclean shutdowns. False
// negatives can cause to skip index building. And, false positives can cause mismatch in number
// of index entries among the nodes in the replica set. So, verify the collection is really
// empty by opening the WT cursor and reading the first document.
return collection->isEmpty(opCtx);
}
/*
* Determines whether to skip the index build state transition check.
* Index builder not using ReplIndexBuildState::waitForNextAction to signal primary and secondaries
* to commit or abort signal will violate index build state transition. So, we should skip state
* transition verification. Otherwise, we would invariant.
*/
bool shouldSkipIndexBuildStateTransitionCheck(OperationContext* opCtx,
IndexBuildProtocol protocol) {
const auto replCoord = repl::ReplicationCoordinator::get(opCtx);
if (replCoord->getSettings().usingReplSets() && protocol == IndexBuildProtocol::kTwoPhase) {
return false;
}
return true;
}
/**
* Replicates a commitIndexBuild oplog entry for two-phase builds, which signals downstream
* secondary nodes to commit the index build.
*/
void onCommitIndexBuild(OperationContext* opCtx,
const NamespaceString& nss,
ReplIndexBuildState& replState) {
const auto& buildUUID = replState.buildUUID;
auto skipCheck = shouldSkipIndexBuildStateTransitionCheck(opCtx, replState.protocol);
{
stdx::unique_lock<Latch> lk(replState.mutex);
replState.indexBuildState.setState(IndexBuildState::kCommitted, skipCheck);
}
if (IndexBuildProtocol::kSinglePhase == replState.protocol) {
return;
}
invariant(IndexBuildProtocol::kTwoPhase == replState.protocol,
str::stream() << "onCommitIndexBuild: " << buildUUID);
invariant(opCtx->lockState()->isWriteLocked(),
str::stream() << "onCommitIndexBuild: " << buildUUID);
auto opObserver = opCtx->getServiceContext()->getOpObserver();
const auto& collUUID = replState.collectionUUID;
const auto& indexSpecs = replState.indexSpecs;
auto fromMigrate = false;
// Since two phase index builds are allowed to survive replication state transitions, we should
// check if the node is currently a primary before attempting to write to the oplog.
auto replCoord = repl::ReplicationCoordinator::get(opCtx);
if (!replCoord->canAcceptWritesFor(opCtx, nss)) {
invariant(!opCtx->recoveryUnit()->getCommitTimestamp().isNull(),
str::stream() << "commitIndexBuild: " << buildUUID);
return;
}
opObserver->onCommitIndexBuild(opCtx, nss, collUUID, buildUUID, indexSpecs, fromMigrate);
}
/**
* Replicates an abortIndexBuild oplog entry for two-phase builds, which signals downstream
* secondary nodes to abort the index build.
*/
void onAbortIndexBuild(OperationContext* opCtx,
const NamespaceString& nss,
ReplIndexBuildState& replState,
const Status& cause) {
if (IndexBuildProtocol::kTwoPhase != replState.protocol) {
return;
}
invariant(opCtx->lockState()->isWriteLocked(), replState.buildUUID.toString());
auto opObserver = opCtx->getServiceContext()->getOpObserver();
auto collUUID = replState.collectionUUID;
auto fromMigrate = false;
opObserver->onAbortIndexBuild(
opCtx, nss, collUUID, replState.buildUUID, replState.indexSpecs, cause, fromMigrate);
}
/**
* We do not need synchronization with step up and step down. Dropping the RSTL is important because
* otherwise if we held the RSTL it would create deadlocks with prepared transactions on step up and
* step down. A deadlock could result if the index build was attempting to acquire a Collection S
* or X lock while a prepared transaction held a Collection IX lock, and a step down was waiting to
* acquire the RSTL in mode X.
*/
void unlockRSTL(OperationContext* opCtx) {
invariant(opCtx->lockState()->unlockRSTLforPrepare());
invariant(!opCtx->lockState()->isRSTLLocked());
}
/**
* Logs the index build failure error in a standard format.
*/
void logFailure(Status status,
const NamespaceString& nss,
std::shared_ptr<ReplIndexBuildState> replState) {
LOGV2(20649,
"Index build failed",
"buildUUID"_attr = replState->buildUUID,
"collection"_attr = nss,
"collectionUUID"_attr = replState->collectionUUID,
"status"_attr = status);
}
/**
* Iterates over index builds with the provided function.
*/
void forEachIndexBuild(
const std::vector<std::shared_ptr<ReplIndexBuildState>>& indexBuilds,
StringData logPrefix,
std::function<void(std::shared_ptr<ReplIndexBuildState> replState)> onIndexBuild) {
if (indexBuilds.empty()) {
return;
}
LOGV2(20650,
"{logPrefix}active index builds: {indexBuilds_size}",
"logPrefix"_attr = logPrefix,
"indexBuilds_size"_attr = indexBuilds.size());
for (auto replState : indexBuilds) {
std::string indexNamesStr;
str::joinStringDelim(replState->indexNames, &indexNamesStr, ',');
LOGV2(20651,
"{logPrefix}{replState_buildUUID}: collection: {replState_collectionUUID}; indexes: "
"{replState_indexNames_size} [{indexNamesStr}]; method: "
"{IndexBuildProtocol_kTwoPhase_replState_protocol_two_phase_single_phase}",
"logPrefix"_attr = logPrefix,
"replState_buildUUID"_attr = replState->buildUUID,
"replState_collectionUUID"_attr = replState->collectionUUID,
"replState_indexNames_size"_attr = replState->indexNames.size(),
"indexNamesStr"_attr = indexNamesStr,
"IndexBuildProtocol_kTwoPhase_replState_protocol_two_phase_single_phase"_attr =
(IndexBuildProtocol::kTwoPhase == replState->protocol ? "two phase"
: "single phase"));
onIndexBuild(replState);
}
}
/**
* Updates currentOp for commitIndexBuild or abortIndexBuild.
*/
void updateCurOpForCommitOrAbort(OperationContext* opCtx, StringData fieldName, UUID buildUUID) {
BSONObjBuilder builder;
buildUUID.appendToBuilder(&builder, fieldName);
stdx::unique_lock<Client> lk(*opCtx->getClient());
auto curOp = CurOp::get(opCtx);
builder.appendElementsUnique(curOp->opDescription());
auto opDescObj = builder.obj();
curOp->setLogicalOp_inlock(LogicalOp::opCommand);
curOp->setOpDescription_inlock(opDescObj);
curOp->ensureStarted();
}
} // namespace
const auto getIndexBuildsCoord =
ServiceContext::declareDecoration<std::unique_ptr<IndexBuildsCoordinator>>();
void IndexBuildsCoordinator::set(ServiceContext* serviceContext,
std::unique_ptr<IndexBuildsCoordinator> ibc) {
auto& indexBuildsCoordinator = getIndexBuildsCoord(serviceContext);
invariant(!indexBuildsCoordinator);
indexBuildsCoordinator = std::move(ibc);
}
IndexBuildsCoordinator* IndexBuildsCoordinator::get(ServiceContext* serviceContext) {
auto& indexBuildsCoordinator = getIndexBuildsCoord(serviceContext);
invariant(indexBuildsCoordinator);
return indexBuildsCoordinator.get();
}
IndexBuildsCoordinator* IndexBuildsCoordinator::get(OperationContext* OperationContext) {
return get(OperationContext->getServiceContext());
}
IndexBuildsCoordinator::~IndexBuildsCoordinator() {
invariant(_allIndexBuilds.empty());
}
bool IndexBuildsCoordinator::supportsTwoPhaseIndexBuild() {
return true;
}
std::vector<std::string> IndexBuildsCoordinator::extractIndexNames(
const std::vector<BSONObj>& specs) {
std::vector<std::string> indexNames;
for (const auto& spec : specs) {
std::string name = spec.getStringField(IndexDescriptor::kIndexNameFieldName);
invariant(!name.empty(),
str::stream() << "Bad spec passed into ReplIndexBuildState constructor, missing '"
<< IndexDescriptor::kIndexNameFieldName << "' field: " << spec);
indexNames.push_back(name);
}
return indexNames;
}
StatusWith<std::pair<long long, long long>> IndexBuildsCoordinator::rebuildIndexesForRecovery(
OperationContext* opCtx,
const NamespaceString& nss,
const std::vector<BSONObj>& specs,
const UUID& buildUUID,
RepairData repair) {
const auto protocol = IndexBuildProtocol::kSinglePhase;
auto status = _startIndexBuildForRecovery(opCtx, nss, specs, buildUUID, protocol);
if (!status.isOK()) {
return status;
}
auto& collectionCatalog = CollectionCatalog::get(getGlobalServiceContext());
Collection* collection = collectionCatalog.lookupCollectionByNamespace(opCtx, nss);
// Complete the index build.
return _runIndexRebuildForRecovery(opCtx, collection, buildUUID, repair);
}
Status IndexBuildsCoordinator::_startIndexBuildForRecovery(OperationContext* opCtx,
const NamespaceString& nss,
const std::vector<BSONObj>& specs,
const UUID& buildUUID,
IndexBuildProtocol protocol) {
invariant(opCtx->lockState()->isCollectionLockedForMode(nss, MODE_X));
std::vector<std::string> indexNames;
for (auto& spec : specs) {
std::string name = spec.getStringField(IndexDescriptor::kIndexNameFieldName);
if (name.empty()) {
return Status(ErrorCodes::CannotCreateIndex,
str::stream()
<< "Cannot create an index for a spec '" << spec
<< "' without a non-empty string value for the 'name' field");
}
indexNames.push_back(name);
}
auto& collectionCatalog = CollectionCatalog::get(getGlobalServiceContext());
Collection* collection = collectionCatalog.lookupCollectionByNamespace(opCtx, nss);
auto indexCatalog = collection->getIndexCatalog();
{
// These steps are combined into a single WUOW to ensure there are no commits without
// the indexes.
// 1) Drop all unfinished indexes.
// 2) Start, but do not complete the index build process.
WriteUnitOfWork wuow(opCtx);
for (size_t i = 0; i < indexNames.size(); i++) {
bool includeUnfinished = false;
auto descriptor =
indexCatalog->findIndexByName(opCtx, indexNames[i], includeUnfinished);
if (descriptor) {
Status s = indexCatalog->dropIndex(opCtx, descriptor);
if (!s.isOK()) {
return s;
}
continue;
}
// If the index is not present in the catalog, then we are trying to drop an already
// aborted index. This may happen when rollback-via-refetch restarts an index build
// after an abort has been rolled back.
if (!DurableCatalog::get(opCtx)->isIndexPresent(
opCtx, collection->getCatalogId(), indexNames[i])) {
LOGV2(20652,
"The index for build {buildUUID} was not found while trying to drop the "
"index during recovery: {indexNames_i}",
"buildUUID"_attr = buildUUID,
"indexNames_i"_attr = indexNames[i]);
continue;
}
const auto durableBuildUUID = DurableCatalog::get(opCtx)->getIndexBuildUUID(
opCtx, collection->getCatalogId(), indexNames[i]);
// A build UUID is present if and only if we are rebuilding a two-phase build.
invariant((protocol == IndexBuildProtocol::kTwoPhase) ==
durableBuildUUID.is_initialized());
// When a buildUUID is present, it must match the build UUID parameter to this
// function.
invariant(!durableBuildUUID || *durableBuildUUID == buildUUID,
str::stream() << "durable build UUID: " << durableBuildUUID
<< "buildUUID: " << buildUUID);
// If the unfinished index is in the IndexCatalog, drop it through there, otherwise drop
// it from the DurableCatalog. Rollback-via-refetch does not clear any in-memory state,
// so we should do it manually here.
includeUnfinished = true;
descriptor = indexCatalog->findIndexByName(opCtx, indexNames[i], includeUnfinished);
if (descriptor) {
Status s = indexCatalog->dropUnfinishedIndex(opCtx, descriptor);
if (!s.isOK()) {
return s;
}
} else {
Status status = DurableCatalog::get(opCtx)->removeIndex(
opCtx, collection->getCatalogId(), indexNames[i]);
if (!status.isOK()) {
return status;
}
}
}
// We need to initialize the collection to rebuild the indexes. The collection may already
// be initialized when rebuilding indexes with rollback-via-refetch.
if (!collection->isInitialized()) {
collection->init(opCtx);
}
auto dbName = nss.db().toString();
auto replIndexBuildState = std::make_shared<ReplIndexBuildState>(
buildUUID, collection->uuid(), dbName, specs, protocol);
Status status = [&]() {
stdx::unique_lock<Latch> lk(_mutex);
return _registerIndexBuild(lk, replIndexBuildState);
}();
if (!status.isOK()) {
return status;
}
IndexBuildsManager::SetupOptions options;
status = _indexBuildsManager.setUpIndexBuild(
opCtx, collection, specs, buildUUID, MultiIndexBlock::kNoopOnInitFn, options);
if (!status.isOK()) {
// An index build failure during recovery is fatal.
logFailure(status, nss, replIndexBuildState);
fassertNoTrace(51086, status);
}
wuow.commit();
}
return Status::OK();
}
std::string IndexBuildsCoordinator::_indexBuildActionToString(IndexBuildAction action) {
if (action == IndexBuildAction::kNoAction) {
return "No action";
} else if (action == IndexBuildAction::kOplogCommit) {
return "Oplog commit";
} else if (action == IndexBuildAction::kOplogAbort) {
return "Oplog abort";
} else if (action == IndexBuildAction::kInitialSyncAbort) {
return "Initial sync abort";
} else if (action == IndexBuildAction::kRollbackAbort) {
return "Rollback abort";
} else if (action == IndexBuildAction::kPrimaryAbort) {
return "Primary abort";
} else if (action == IndexBuildAction::kSinglePhaseCommit) {
return "Single-phase commit";
} else if (action == IndexBuildAction::kCommitQuorumSatisfied) {
return "Commit quorum Satisfied";
}
MONGO_UNREACHABLE;
}
void IndexBuildsCoordinator::waitForAllIndexBuildsToStopForShutdown(OperationContext* opCtx) {
stdx::unique_lock<Latch> lk(_mutex);
// All index builds should have been signaled to stop via the ServiceContext.
if (_allIndexBuilds.empty()) {
return;
}
LOGV2(4725201,
"Waiting until the following index builds are finished:",
"numIndexBuilds"_attr = _allIndexBuilds.size());
for (const auto& indexBuild : _allIndexBuilds) {
LOGV2(4725202, " Index build with UUID", "indexBuild_first"_attr = indexBuild.first);
}
// Wait for all the index builds to stop.
auto pred = [this]() { return _allIndexBuilds.empty(); };
_indexBuildsCondVar.wait(lk, pred);
}
std::vector<UUID> IndexBuildsCoordinator::abortCollectionIndexBuilds(
OperationContext* opCtx,
const NamespaceString collectionNss,
const UUID collectionUUID,
const std::string& reason) {
LOGV2(23879,
"About to abort all index builders on collection",
"collection"_attr = collectionNss,
"collectionUUID"_attr = collectionUUID,
"reason"_attr = reason);
auto collIndexBuilds = [&]() -> std::vector<std::shared_ptr<ReplIndexBuildState>> {
stdx::unique_lock<Latch> lk(_mutex);
auto indexBuildFilter = [=](const auto& replState) {
return collectionUUID == replState.collectionUUID;
};
return _filterIndexBuilds_inlock(lk, indexBuildFilter);
}();
std::vector<UUID> buildUUIDs;
for (auto replState : collIndexBuilds) {
if (abortIndexBuildByBuildUUID(
opCtx, replState->buildUUID, IndexBuildAction::kPrimaryAbort, reason)) {
buildUUIDs.push_back(replState->buildUUID);
}
}
return buildUUIDs;
}
void IndexBuildsCoordinator::_awaitNoBgOpInProgForDb(stdx::unique_lock<Latch>& lk,
OperationContext* opCtx,
StringData db) {
auto indexBuildFilter = [db](const auto& replState) { return db == replState.dbName; };
auto pred = [&, this]() {
auto dbIndexBuilds = _filterIndexBuilds_inlock(lk, indexBuildFilter);
return dbIndexBuilds.empty();
};
_indexBuildsCondVar.wait(lk, pred);
}
void IndexBuildsCoordinator::abortDatabaseIndexBuilds(OperationContext* opCtx,
StringData db,
const std::string& reason) {
LOGV2(4612302,
"About to abort all index builders running for collections in the given database",
"database"_attr = db,
"reason"_attr = reason);
auto builds = [&]() -> std::vector<std::shared_ptr<ReplIndexBuildState>> {
stdx::unique_lock<Latch> lk(_mutex);
auto indexBuildFilter = [=](const auto& replState) { return db == replState.dbName; };
return _filterIndexBuilds_inlock(lk, indexBuildFilter);
}();
for (auto replState : builds) {
abortIndexBuildByBuildUUID(
opCtx, replState->buildUUID, IndexBuildAction::kPrimaryAbort, reason);
}
}
namespace {
NamespaceString getNsFromUUID(OperationContext* opCtx, const UUID& uuid) {
auto& catalog = CollectionCatalog::get(opCtx);
auto nss = catalog.lookupNSSByUUID(opCtx, uuid);
uassert(ErrorCodes::NamespaceNotFound, "No namespace with UUID " + uuid.toString(), nss);
return *nss;
}
} // namespace
void IndexBuildsCoordinator::applyStartIndexBuild(OperationContext* opCtx,
ApplicationMode applicationMode,
const IndexBuildOplogEntry& oplogEntry) {
const auto collUUID = oplogEntry.collUUID;
const auto nss = getNsFromUUID(opCtx, collUUID);
IndexBuildsCoordinator::IndexBuildOptions indexBuildOptions;
indexBuildOptions.replSetAndNotPrimaryAtStart = true;
indexBuildOptions.applicationMode = applicationMode;
// If this is an initial syncing node, drop any conflicting ready index specs prior to
// proceeding with building them.
if (indexBuildOptions.applicationMode == ApplicationMode::kInitialSync) {
auto dbAndUUID = NamespaceStringOrUUID(nss.db().toString(), collUUID);
writeConflictRetry(opCtx, "IndexBuildsCoordinator::applyStartIndexBuild", nss.ns(), [&] {
WriteUnitOfWork wuow(opCtx);
AutoGetCollection autoColl(opCtx, dbAndUUID, MODE_X);
auto coll = autoColl.getCollection();
invariant(coll,
str::stream() << "Collection with UUID " << collUUID << " was dropped.");
IndexCatalog* indexCatalog = coll->getIndexCatalog();
const bool includeUnfinished = false;
for (const auto& spec : oplogEntry.indexSpecs) {
std::string name = spec.getStringField(IndexDescriptor::kIndexNameFieldName);
uassert(ErrorCodes::BadValue,
str::stream() << "Index spec is missing the 'name' field " << spec,
!name.empty());
if (auto desc = indexCatalog->findIndexByName(opCtx, name, includeUnfinished)) {
uassertStatusOK(indexCatalog->dropIndex(opCtx, desc));
}
}
wuow.commit();
});
}
auto indexBuildsCoord = IndexBuildsCoordinator::get(opCtx);
uassertStatusOK(
indexBuildsCoord
->startIndexBuild(opCtx,
nss.db().toString(),
collUUID,
oplogEntry.indexSpecs,
oplogEntry.buildUUID,
/* This oplog entry is only replicated for two-phase index builds */
IndexBuildProtocol::kTwoPhase,
indexBuildOptions)
.getStatus());
}
void IndexBuildsCoordinator::applyCommitIndexBuild(OperationContext* opCtx,
const IndexBuildOplogEntry& oplogEntry) {
const auto collUUID = oplogEntry.collUUID;
const auto nss = getNsFromUUID(opCtx, collUUID);
const auto& buildUUID = oplogEntry.buildUUID;
updateCurOpForCommitOrAbort(opCtx, kCommitIndexBuildFieldName, buildUUID);
uassert(31417,
str::stream()
<< "No commit timestamp set while applying commitIndexBuild operation. Build UUID: "
<< buildUUID,
!opCtx->recoveryUnit()->getCommitTimestamp().isNull());
// There is a possibility that we cannot find an active index build with the given build UUID.
// This can be the case when the index already exists or was dropped on the sync source before
// the collection was cloned during initial sync. The oplog code will ignore the NoSuchKey
// error code.
//
// Case 1: Index already exists:
// +-----------------------------------------+--------------------------------+
// | Sync Target | Sync Source |
// +-----------------------------------------+--------------------------------+
// | | startIndexBuild 'x' at TS: 1. |
// | Start oplog fetcher at TS: 2. | |
// | | commitIndexBuild 'x' at TS: 2. |
// | Begin cloning the collection. | |
// | Index 'x' is listed as ready, build it. | |
// | Finish cloning the collection. | |
// | Start the oplog replay phase. | |
// | Apply commitIndexBuild 'x'. | |
// | --- Index build not found --- | |
// +-----------------------------------------+--------------------------------+
//
// Case 2: Sync source dropped the index:
// +--------------------------------+--------------------------------+
// | Sync Target | Sync Source |
// +--------------------------------+--------------------------------+
// | | startIndexBuild 'x' at TS: 1. |
// | Start oplog fetcher at TS: 2. | |
// | | commitIndexBuild 'x' at TS: 2. |
// | | dropIndex 'x' at TS: 3. |
// | Begin cloning the collection. | |
// | No user indexes to build. | |
// | Finish cloning the collection. | |
// | Start the oplog replay phase. | |
// | Apply commitIndexBuild 'x'. | |
// | --- Index build not found --- | |
// +--------------------------------+--------------------------------+
auto replState = uassertStatusOK(_getIndexBuild(buildUUID));
// Retry until we are able to put the index build in the kPrepareCommit state. None of the
// conditions for retrying are common or expected to be long-lived, so we believe this to be
// safe to poll at this frequency.
while (!_tryCommit(opCtx, replState)) {
opCtx->sleepFor(Milliseconds(100));
}
auto fut = replState->sharedPromise.getFuture();
LOGV2(20654,
"Index build joined after commit",
"buildUUID"_attr = buildUUID,
"result"_attr = fut.waitNoThrow(opCtx));
// Throws if there was an error building the index.
fut.get();
}
bool IndexBuildsCoordinator::_tryCommit(OperationContext* opCtx,
std::shared_ptr<ReplIndexBuildState> replState) {
stdx::unique_lock<Latch> lk(replState->mutex);
if (replState->indexBuildState.isSettingUp()) {
// It's possible that the index build thread has not reached the point where it can be
// committed yet.
return false;
}
if (replState->waitForNextAction->getFuture().isReady()) {
// If the future wait were uninterruptible, then shutdown could hang. If the
// IndexBuildsCoordinator thread gets interrupted on shutdown, the oplog applier will hang
// waiting for the promise applying the commitIndexBuild oplog entry.
const auto nextAction = replState->waitForNextAction->getFuture().get(opCtx);
invariant(nextAction == IndexBuildAction::kCommitQuorumSatisfied);
// Retry until the current promise result is consumed by the index builder thread and
// a new empty promise got created by the indexBuildscoordinator thread.
return false;
}
auto skipCheck = shouldSkipIndexBuildStateTransitionCheck(opCtx, replState->protocol);
replState->indexBuildState.setState(
IndexBuildState::kPrepareCommit, skipCheck, opCtx->recoveryUnit()->getCommitTimestamp());
// Promise can be set only once.
// We can't skip signaling here if a signal is already set because the previous commit or
// abort signal might have been sent to handle for primary case.
setSignalAndCancelVoteRequestCbkIfActive(lk, opCtx, replState, IndexBuildAction::kOplogCommit);
return true;
}
void IndexBuildsCoordinator::applyAbortIndexBuild(OperationContext* opCtx,
const IndexBuildOplogEntry& oplogEntry) {
const auto collUUID = oplogEntry.collUUID;
const auto nss = getNsFromUUID(opCtx, collUUID);
const auto& buildUUID = oplogEntry.buildUUID;
updateCurOpForCommitOrAbort(opCtx, kCommitIndexBuildFieldName, buildUUID);
invariant(oplogEntry.cause);
uassert(31420,
str::stream()
<< "No commit timestamp set while applying abortIndexBuild operation. Build UUID: "
<< buildUUID,
!opCtx->recoveryUnit()->getCommitTimestamp().isNull());
std::string abortReason(str::stream()
<< "abortIndexBuild oplog entry encountered: " << *oplogEntry.cause);
auto indexBuildsCoord = IndexBuildsCoordinator::get(opCtx);
indexBuildsCoord->abortIndexBuildByBuildUUID(
opCtx, buildUUID, IndexBuildAction::kOplogAbort, abortReason);
}
boost::optional<UUID> IndexBuildsCoordinator::abortIndexBuildByIndexNames(
OperationContext* opCtx,
const UUID& collectionUUID,
const std::vector<std::string>& indexNames,
std::string reason) {
boost::optional<UUID> buildUUID;
auto indexBuilds = _getIndexBuilds();
auto onIndexBuild = [&](std::shared_ptr<ReplIndexBuildState> replState) {
if (replState->collectionUUID != collectionUUID) {
return;
}
bool matchedBuilder = std::is_permutation(indexNames.begin(),
indexNames.end(),
replState->indexNames.begin(),
replState->indexNames.end());
if (!matchedBuilder) {
return;
}
LOGV2(23880,
"About to abort index builder: {replState_buildUUID} on collection: "
"{collectionUUID}. First index: {replState_indexNames_front}",
"replState_buildUUID"_attr = replState->buildUUID,
"collectionUUID"_attr = collectionUUID,
"replState_indexNames_front"_attr = replState->indexNames.front());
if (abortIndexBuildByBuildUUID(
opCtx, replState->buildUUID, IndexBuildAction::kPrimaryAbort, reason)) {
buildUUID = replState->buildUUID;
}
};
forEachIndexBuild(
indexBuilds, "IndexBuildsCoordinator::abortIndexBuildByIndexNames - "_sd, onIndexBuild);
return buildUUID;
}
bool IndexBuildsCoordinator::hasIndexBuilder(OperationContext* opCtx,
const UUID& collectionUUID,
const std::vector<std::string>& indexNames) const {
bool foundIndexBuilder = false;
boost::optional<UUID> buildUUID;
auto indexBuilds = _getIndexBuilds();
auto onIndexBuild = [&](std::shared_ptr<ReplIndexBuildState> replState) {
if (replState->collectionUUID != collectionUUID) {
return;
}
bool matchedBuilder = std::is_permutation(indexNames.begin(),
indexNames.end(),
replState->indexNames.begin(),
replState->indexNames.end());
if (!matchedBuilder) {
return;
}
foundIndexBuilder = true;
};
forEachIndexBuild(indexBuilds, "IndexBuildsCoordinator::hasIndexBuilder - "_sd, onIndexBuild);
return foundIndexBuilder;
}
IndexBuildsCoordinator::TryAbortResult IndexBuildsCoordinator::_tryAbort(
OperationContext* opCtx,
std::shared_ptr<ReplIndexBuildState> replState,
IndexBuildAction signalAction,
std::string reason) {
{
stdx::unique_lock<Latch> lk(replState->mutex);
// Wait until the build is done setting up. This indicates that all required state is
// initialized to attempt an abort.
if (replState->indexBuildState.isSettingUp()) {
LOGV2_DEBUG(465605,
2,
"waiting until index build is done setting up before attempting to abort",
"buildUUID"_attr = replState->buildUUID);
return TryAbortResult::kRetry;
}
if (replState->waitForNextAction->getFuture().isReady()) {
const auto nextAction = replState->waitForNextAction->getFuture().get(opCtx);
invariant(nextAction == IndexBuildAction::kSinglePhaseCommit ||
nextAction == IndexBuildAction::kCommitQuorumSatisfied ||
nextAction == IndexBuildAction::kPrimaryAbort);
// Index build coordinator already received a signal to commit or abort. So, it's ok
// to return and wait for the index build to complete if we are trying to signal
// 'kPrimaryAbort'. The index build coordinator will not perform the signaled action
// (i.e, will not commit or abort the index build) only when the node steps down.
// When the node steps down, the caller of this function, dropIndexes/createIndexes
// command (user operation) will also get interrupted. So, we no longer need to
// abort the index build on step down.
if (signalAction == IndexBuildAction::kPrimaryAbort) {
// Indicate if the index build is already being committed or aborted.
if (nextAction == IndexBuildAction::kPrimaryAbort) {
return TryAbortResult::kAlreadyAborted;
} else {
return TryAbortResult::kNotAborted;
}
}
// Retry until the current promise result is consumed by the index builder thread
// and a new empty promise got created by the indexBuildscoordinator thread. Or,
// until the index build got torn down after index build commit.
return TryAbortResult::kRetry;
}
LOGV2(4656003,
"Aborting index build",
"buildUUID"_attr = replState->buildUUID,
"reason"_attr = reason);
// Set the state on replState. Once set, the calling thread must complete the abort process.
auto abortTimestamp =
boost::make_optional<Timestamp>(!opCtx->recoveryUnit()->getCommitTimestamp().isNull(),
opCtx->recoveryUnit()->getCommitTimestamp());
auto skipCheck = shouldSkipIndexBuildStateTransitionCheck(opCtx, replState->protocol);
replState->indexBuildState.setState(
IndexBuildState::kAborted, skipCheck, abortTimestamp, reason);
// Interrupt the builder thread so that it can no longer acquire locks or make progress.
auto serviceContext = opCtx->getServiceContext();
auto target = serviceContext->getLockedClient(replState->opId);
if (!target) {
LOGV2_FATAL(4656001,
"Index builder thread did not appear to be running while aborting",
"buildUUID"_attr = replState->buildUUID,
"opId"_attr = replState->opId);
}
serviceContext->killOperation(
target, target->getOperationContext(), ErrorCodes::IndexBuildAborted);
// Set the signal. Because we have already interrupted the index build, it will not observe
// this signal. We do this so that other observers do not also try to abort the index build.
setSignalAndCancelVoteRequestCbkIfActive(lk, opCtx, replState, signalAction);
}
return TryAbortResult::kContinueAbort;
}
bool IndexBuildsCoordinator::abortIndexBuildByBuildUUID(OperationContext* opCtx,
const UUID& buildUUID,
IndexBuildAction signalAction,
std::string reason) {
std::shared_ptr<ReplIndexBuildState> replState;
bool retry = false;
while (true) {
// Retry until we are able to put the index build into the kAborted state. None of the
// conditions for retrying are common or expected to be long-lived, so we believe this to be
// safe to poll at this frequency.
if (retry) {
opCtx->sleepFor(Milliseconds(1000));
retry = false;
}
// It is possible to receive an abort for a non-existent index build. Abort should always
// succeed, so suppress the error.
auto replStateResult = _getIndexBuild(buildUUID);
if (!replStateResult.isOK()) {
LOGV2(20656,
"ignoring error while aborting index build {buildUUID}: "
"{replStateResult_getStatus}",
"buildUUID"_attr = buildUUID,
"replStateResult_getStatus"_attr = replStateResult.getStatus());
return false;
}
replState = replStateResult.getValue();
LOGV2(4656010, "attempting to abort index build", "buildUUID"_attr = replState->buildUUID);
const NamespaceStringOrUUID dbAndUUID(replState->dbName, replState->collectionUUID);
Lock::DBLock dbLock(opCtx, replState->dbName, MODE_IX);
if (IndexBuildProtocol::kSinglePhase == replState->protocol) {
// Unlock RSTL to avoid deadlocks with prepare conflicts and state transitions caused by
// taking a strong collection lock. See SERVER-42621.
unlockRSTL(opCtx);
}
Lock::CollectionLock collLock(opCtx, dbAndUUID, MODE_X);
// If we are using two-phase index builds and are no longer primary after receiving an
// abort, we cannot replicate an abortIndexBuild oplog entry. Continue holding the RSTL to
// check the replication state and to prevent any state transitions from happening while
// aborting the index build. Once an index build is put into kAborted, the index builder
// thread will be torn down, and an oplog entry must be replicated. Single-phase builds do
// not have this restriction and may be aborted after a stepDown. Initial syncing nodes need
// to be able to abort two phase index builds during the oplog replay phase.
if (IndexBuildProtocol::kTwoPhase == replState->protocol) {
// The DBLock helper takes the RSTL implicitly.
invariant(opCtx->lockState()->isRSTLLocked());
// Override the 'signalAction' as this is an initial syncing node.
auto replCoord = repl::ReplicationCoordinator::get(opCtx);
if (replCoord->getMemberState().startup2()) {
LOGV2_DEBUG(4665902,
1,
"Overriding abort 'signalAction' for initial sync",
"from"_attr = signalAction,
"to"_attr = IndexBuildAction::kInitialSyncAbort);
signalAction = IndexBuildAction::kInitialSyncAbort;
}
if (IndexBuildAction::kPrimaryAbort == signalAction &&
!replCoord->canAcceptWritesFor(opCtx, dbAndUUID)) {
uassertStatusOK({ErrorCodes::NotMaster,
str::stream()
<< "Unable to abort index build because we are not primary: "
<< buildUUID});
}
}
auto tryAbortResult = _tryAbort(opCtx, replState, signalAction, reason);
switch (tryAbortResult) {
case TryAbortResult::kNotAborted:
return false;
case TryAbortResult::kAlreadyAborted:
return true;
case TryAbortResult::kRetry:
case TryAbortResult::kContinueAbort:
break;
}
if (TryAbortResult::kRetry == tryAbortResult) {
retry = true;
continue;
}
invariant(TryAbortResult::kContinueAbort == tryAbortResult);
// At this point we must continue aborting the index build.
try {
_completeAbort(opCtx, replState, signalAction, {ErrorCodes::IndexBuildAborted, reason});
} catch (const DBException& e) {
LOGV2_FATAL(