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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_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
#include "mongo/platform/basic.h"
#include "mongo/db/s/collection_sharding_runtime.h"
#include "mongo/base/checked_cast.h"
#include "mongo/db/catalog_raii.h"
#include "mongo/db/s/sharding_runtime_d_params_gen.h"
#include "mongo/util/duration.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
/**
* Returns whether the specified namespace is used for sharding-internal purposes only and can never
* be marked as anything other than UNSHARDED, because the call sites which reference these
* collections are not prepared to handle StaleConfig errors.
*/
bool isNamespaceAlwaysUnsharded(const NamespaceString& nss) {
// There should never be a case to mark as sharded collections which are on the config server
if (serverGlobalParams.clusterRole != ClusterRole::ShardServer)
return true;
// Local and admin never have sharded collections
if (nss.db() == NamespaceString::kLocalDb || nss.db() == NamespaceString::kAdminDb)
return true;
// Certain config collections can never be sharded
if (nss == NamespaceString::kSessionTransactionsTableNamespace)
return true;
if (nss.isSystemDotProfile())
return true;
return false;
}
} // namespace
CollectionShardingRuntime::CollectionShardingRuntime(ServiceContext* sc,
NamespaceString nss,
executor::TaskExecutor* rangeDeleterExecutor)
: CollectionShardingState(nss),
_nss(std::move(nss)),
_metadataManager(std::make_shared<MetadataManager>(sc, _nss, rangeDeleterExecutor)) {
if (isNamespaceAlwaysUnsharded(_nss)) {
_metadataManager->setFilteringMetadata(CollectionMetadata());
}
}
CollectionShardingRuntime* CollectionShardingRuntime::get(OperationContext* opCtx,
const NamespaceString& nss) {
auto* const css = CollectionShardingState::get(opCtx, nss);
return checked_cast<CollectionShardingRuntime*>(css);
}
CollectionShardingRuntime* CollectionShardingRuntime::get_UNSAFE(ServiceContext* svcCtx,
const NamespaceString& nss) {
auto* const css = CollectionShardingState::get_UNSAFE(svcCtx, nss);
return checked_cast<CollectionShardingRuntime*>(css);
}
void CollectionShardingRuntime::setFilteringMetadata(OperationContext* opCtx,
CollectionMetadata newMetadata) {
invariant(!newMetadata.isSharded() || !isNamespaceAlwaysUnsharded(_nss),
str::stream() << "Namespace " << _nss.ns() << " must never be sharded.");
auto csrLock = CollectionShardingState::CSRLock::lockExclusive(opCtx, this);
_metadataManager->setFilteringMetadata(std::move(newMetadata));
}
void CollectionShardingRuntime::clearFilteringMetadata() {
if (!isNamespaceAlwaysUnsharded(_nss)) {
_metadataManager->clearFilteringMetadata();
}
}
auto CollectionShardingRuntime::beginReceive(ChunkRange const& range) -> CleanupNotification {
return _metadataManager->beginReceive(range);
}
void CollectionShardingRuntime::forgetReceive(const ChunkRange& range) {
_metadataManager->forgetReceive(range);
}
auto CollectionShardingRuntime::cleanUpRange(ChunkRange const& range, CleanWhen when)
-> CleanupNotification {
Date_t time =
(when == kNow) ? Date_t{} : Date_t::now() + Seconds(orphanCleanupDelaySecs.load());
return _metadataManager->cleanUpRange(range, time);
}
Status CollectionShardingRuntime::waitForClean(OperationContext* opCtx,
const NamespaceString& nss,
OID const& epoch,
ChunkRange orphanRange) {
while (true) {
boost::optional<CleanupNotification> stillScheduled;
{
AutoGetCollection autoColl(opCtx, nss, MODE_IX);
auto* const self = CollectionShardingRuntime::get(opCtx, nss);
{
// First, see if collection was dropped, but do it in a separate scope in order to
// not hold reference on it, which would make it appear in use
const auto optMetadata =
self->_metadataManager->getActiveMetadata(self->_metadataManager, boost::none);
if (!optMetadata)
return {ErrorCodes::ConflictingOperationInProgress,
"Collection being migrated had its metadata reset"};
const auto& metadata = *optMetadata;
if (!metadata->isSharded() || metadata->getCollVersion().epoch() != epoch) {
return {ErrorCodes::ConflictingOperationInProgress,
"Collection being migrated was dropped"};
}
}
stillScheduled = self->trackOrphanedDataCleanup(orphanRange);
if (!stillScheduled) {
log() << "Finished deleting " << nss.ns() << " range "
<< redact(orphanRange.toString());
return Status::OK();
}
}
log() << "Waiting for deletion of " << nss.ns() << " range " << orphanRange;
Status result = stillScheduled->waitStatus(opCtx);
if (!result.isOK()) {
return result.withContext(str::stream() << "Failed to delete orphaned " << nss.ns()
<< " range " << orphanRange.toString());
}
}
MONGO_UNREACHABLE;
}
auto CollectionShardingRuntime::trackOrphanedDataCleanup(ChunkRange const& range)
-> boost::optional<CleanupNotification> {
return _metadataManager->trackOrphanedDataCleanup(range);
}
boost::optional<ChunkRange> CollectionShardingRuntime::getNextOrphanRange(BSONObj const& from) {
return _metadataManager->getNextOrphanRange(from);
}
boost::optional<ScopedCollectionMetadata> CollectionShardingRuntime::_getMetadata(
const boost::optional<mongo::LogicalTime>& atClusterTime) {
return _metadataManager->getActiveMetadata(_metadataManager, atClusterTime);
}
CollectionCriticalSection::CollectionCriticalSection(OperationContext* opCtx, NamespaceString ns)
: _nss(std::move(ns)), _opCtx(opCtx) {
AutoGetCollection autoColl(_opCtx,
_nss,
MODE_X,
AutoGetCollection::ViewMode::kViewsForbidden,
opCtx->getServiceContext()->getPreciseClockSource()->now() +
Milliseconds(migrationLockAcquisitionMaxWaitMS.load()));
auto* const csr = CollectionShardingRuntime::get(_opCtx, _nss);
auto csrLock = CollectionShardingState::CSRLock::lockExclusive(_opCtx, csr);
csr->enterCriticalSectionCatchUpPhase(_opCtx, csrLock);
}
CollectionCriticalSection::~CollectionCriticalSection() {
UninterruptibleLockGuard noInterrupt(_opCtx->lockState());
AutoGetCollection autoColl(_opCtx, _nss, MODE_IX);
auto* const csr = CollectionShardingRuntime::get(_opCtx, _nss);
auto csrLock = CollectionShardingRuntime::CSRLock::lockExclusive(_opCtx, csr);
csr->exitCriticalSection(_opCtx, csrLock);
}
void CollectionCriticalSection::enterCommitPhase() {
AutoGetCollection autoColl(_opCtx,
_nss,
MODE_X,
AutoGetCollection::ViewMode::kViewsForbidden,
_opCtx->getServiceContext()->getPreciseClockSource()->now() +
Milliseconds(migrationLockAcquisitionMaxWaitMS.load()));
auto* const csr = CollectionShardingRuntime::get(_opCtx, _nss);
auto csrLock = CollectionShardingRuntime::CSRLock::lockExclusive(_opCtx, csr);
csr->enterCriticalSectionCommitPhase(_opCtx, csrLock);
}
} // namespace mongo
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