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/**
* Copyright (C) 2012 10gen 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::kIndex
#include "mongo/platform/basic.h"
#include "mongo/db/index_builder.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/catalog/index_create.h"
#include "mongo/db/client.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/curop.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/logical_clock.h"
#include "mongo/db/repl/timestamp_block.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using std::endl;
AtomicUInt32 IndexBuilder::_indexBuildCount;
namespace {
/**
* Returns true if writes to the catalog entry for the input namespace require being
* timestamped. A ghost write is when the operation is not committed with an oplog entry and
* implies the caller will look at the logical clock to choose a time to use.
*/
bool requiresGhostCommitTimestamp(OperationContext* opCtx, NamespaceString nss) {
if (!nss.isReplicated() || nss.coll().startsWith("tmp.mr.")) {
return false;
}
auto replCoord = repl::ReplicationCoordinator::get(opCtx);
if (!replCoord->getSettings().usingReplSets()) {
return false;
}
// If there is a commit timestamp already assigned, there's no need to explicitly assign a
// timestamp. This case covers foreground index builds.
if (!opCtx->recoveryUnit()->getCommitTimestamp().isNull()) {
return false;
}
// Only oplog entries (including a user's `applyOps` command) construct indexes via
// `IndexBuilder`. Nodes in `startup` may not yet have initialized the `LogicalClock`, however
// index builds during startup replication recovery must be timestamped. These index builds
// are foregrounded and timestamp their catalog writes with a "commit timestamp". Nodes in the
// oplog application phase of initial sync (`startup2`) must not timestamp index builds before
// the `initialDataTimestamp`.
const auto memberState = replCoord->getMemberState();
if (memberState.startup() || memberState.startup2()) {
return false;
}
return true;
}
// Synchronization tools when replication spawns a background index in a new thread.
// The bool is 'true' when a new background index has started in a new thread but the
// parent thread has not yet synchronized with it.
bool _bgIndexStarting(false);
stdx::mutex _bgIndexStartingMutex;
stdx::condition_variable _bgIndexStartingCondVar;
void _setBgIndexStarting() {
stdx::lock_guard<stdx::mutex> lk(_bgIndexStartingMutex);
invariant(_bgIndexStarting == false);
_bgIndexStarting = true;
_bgIndexStartingCondVar.notify_one();
}
} // namespace
IndexBuilder::IndexBuilder(const BSONObj& index, bool relaxConstraints, Timestamp initIndexTs)
: BackgroundJob(true /* self-delete */),
_index(index.getOwned()),
_relaxConstraints(relaxConstraints),
_initIndexTs(initIndexTs),
_name(str::stream() << "repl index builder " << _indexBuildCount.addAndFetch(1)) {}
IndexBuilder::~IndexBuilder() {}
std::string IndexBuilder::name() const {
return _name;
}
void IndexBuilder::run() {
Client::initThread(name().c_str());
ON_BLOCK_EXIT([] { Client::destroy(); });
LOG(2) << "IndexBuilder building index " << _index;
auto opCtx = cc().makeOperationContext();
ShouldNotConflictWithSecondaryBatchApplicationBlock shouldNotConflictBlock(opCtx->lockState());
AuthorizationSession::get(opCtx->getClient())->grantInternalAuthorization();
{
stdx::lock_guard<Client> lk(*(opCtx->getClient()));
CurOp::get(opCtx.get())->setNetworkOp_inlock(dbInsert);
}
NamespaceString ns(_index["ns"].String());
Lock::DBLock dlk(opCtx.get(), ns.db(), MODE_X);
Database* db = DatabaseHolder::getDatabaseHolder().get(opCtx.get(), ns.db().toString());
Status status = _build(opCtx.get(), db, true, &dlk);
if (!status.isOK()) {
error() << "IndexBuilder could not build index: " << redact(status);
fassert(28555, ErrorCodes::isInterruption(status.code()));
}
}
Status IndexBuilder::buildInForeground(OperationContext* opCtx, Database* db) const {
return _build(opCtx, db, false, NULL);
}
void IndexBuilder::waitForBgIndexStarting() {
stdx::unique_lock<stdx::mutex> lk(_bgIndexStartingMutex);
while (_bgIndexStarting == false) {
_bgIndexStartingCondVar.wait(lk);
}
// Reset for next time.
_bgIndexStarting = false;
}
namespace {
/**
* @param status shalt not be of code `WriteConflict`.
*/
Status _failIndexBuild(MultiIndexBlock& indexer, Status status, bool allowBackgroundBuilding) {
invariant(status.code() != ErrorCodes::WriteConflict);
if (status.code() == ErrorCodes::InterruptedAtShutdown) {
// leave it as-if kill -9 happened. This will be handled on restart.
invariant(allowBackgroundBuilding); // Foreground builds aren't interrupted.
indexer.abortWithoutCleanup();
return status;
}
if (allowBackgroundBuilding) {
error() << "Background index build failed. Status: " << redact(status);
fassertFailed(50769);
} else {
return status;
}
}
} // namespace
Status IndexBuilder::_build(OperationContext* opCtx,
Database* db,
bool allowBackgroundBuilding,
Lock::DBLock* dbLock) const try {
const NamespaceString ns(_index["ns"].String());
Collection* coll = db->getCollection(opCtx, ns);
// Collections should not be implicitly created by the index builder.
fassert(40409, coll);
{
stdx::lock_guard<Client> lk(*opCtx->getClient());
// Show which index we're building in the curop display.
CurOp::get(opCtx)->setOpDescription_inlock(_index);
}
MultiIndexBlock indexer(opCtx, coll);
indexer.allowInterruption();
if (allowBackgroundBuilding)
indexer.allowBackgroundBuilding();
Status status = Status::OK();
{
TimestampBlock tsBlock(opCtx, _initIndexTs);
status = writeConflictRetry(
opCtx, "Init index build", ns.ns(), [&] { return indexer.init(_index).getStatus(); });
}
if (status == ErrorCodes::IndexAlreadyExists ||
(status == ErrorCodes::IndexOptionsConflict && _relaxConstraints)) {
LOG(1) << "Ignoring indexing error: " << redact(status);
if (allowBackgroundBuilding) {
// Must set this in case anyone is waiting for this build.
_setBgIndexStarting();
}
return Status::OK();
}
if (!status.isOK()) {
return _failIndexBuild(indexer, status, allowBackgroundBuilding);
}
if (allowBackgroundBuilding) {
_setBgIndexStarting();
invariant(dbLock);
dbLock->relockWithMode(MODE_IX);
}
{
Lock::CollectionLock collLock(opCtx->lockState(), ns.ns(), MODE_IX);
// WriteConflict exceptions and statuses are not expected to escape this method.
status = indexer.insertAllDocumentsInCollection();
}
if (!status.isOK()) {
return _failIndexBuild(indexer, status, allowBackgroundBuilding);
}
if (allowBackgroundBuilding) {
dbLock->relockWithMode(MODE_X);
}
writeConflictRetry(opCtx, "Commit index build", ns.ns(), [opCtx, &indexer, &ns] {
WriteUnitOfWork wunit(opCtx);
indexer.commit();
if (requiresGhostCommitTimestamp(opCtx, ns)) {
fassert(50701,
opCtx->recoveryUnit()->setTimestamp(
LogicalClock::get(opCtx)->getClusterTime().asTimestamp()));
}
wunit.commit();
});
if (allowBackgroundBuilding) {
dbLock->relockWithMode(MODE_X);
Database* reloadDb = DatabaseHolder::getDatabaseHolder().get(opCtx, ns.db());
fassert(28553, reloadDb);
fassert(28554, reloadDb->getCollection(opCtx, ns));
}
return Status::OK();
} catch (const DBException& e) {
return e.toStatus();
}
}
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