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/**
* Copyright (C) 2008-2014 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/oplog.h"
#include <deque>
#include <set>
#include <vector>
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/authorization_manager_global.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/background.h"
#include "mongo/db/catalog/capped_utils.h"
#include "mongo/db/catalog/coll_mod.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/collection_catalog_entry.h"
#include "mongo/db/catalog/create_collection.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/catalog/drop_collection.h"
#include "mongo/db/catalog/drop_database.h"
#include "mongo/db/catalog/drop_indexes.h"
#include "mongo/db/catalog/rename_collection.h"
#include "mongo/db/catalog/uuid_catalog.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/feature_compatibility_version_parser.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/dbhelpers.h"
#include "mongo/db/index/index_access_method.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/index_builder.h"
#include "mongo/db/keypattern.h"
#include "mongo/db/logical_clock.h"
#include "mongo/db/logical_time.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/op_observer.h"
#include "mongo/db/ops/delete.h"
#include "mongo/db/ops/update.h"
#include "mongo/db/ops/update_lifecycle_impl.h"
#include "mongo/db/repl/apply_ops.h"
#include "mongo/db/repl/bgsync.h"
#include "mongo/db/repl/dbcheck.h"
#include "mongo/db/repl/oplogreader.h"
#include "mongo/db/repl/optime.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/repl/sync_tail.h"
#include "mongo/db/repl/timestamp_block.h"
#include "mongo/db/server_parameters.h"
#include "mongo/db/service_context.h"
#include "mongo/db/session_catalog.h"
#include "mongo/db/stats/counters.h"
#include "mongo/db/storage/storage_engine.h"
#include "mongo/db/storage/storage_options.h"
#include "mongo/platform/random.h"
#include "mongo/scripting/engine.h"
#include "mongo/stdx/memory.h"
#include "mongo/util/concurrency/idle_thread_block.h"
#include "mongo/util/elapsed_tracker.h"
#include "mongo/util/fail_point_service.h"
#include "mongo/util/file.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/stacktrace.h"
#include "mongo/util/startup_test.h"
namespace mongo {
using std::endl;
using std::string;
using std::stringstream;
using std::unique_ptr;
using std::vector;
using IndexVersion = IndexDescriptor::IndexVersion;
namespace repl {
namespace {
MONGO_FP_DECLARE(sleepBetweenInsertOpTimeGenerationAndLogOp);
/**
* The `_localOplogCollection` pointer is always valid (or null) because an
* operation must take the global exclusive lock to set the pointer to null when
* the Collection instance is destroyed. See `oplogCheckCloseDatabase`.
*/
Collection* _localOplogCollection = nullptr;
PseudoRandom hashGenerator(std::unique_ptr<SecureRandom>(SecureRandom::create())->nextInt64());
// Synchronizes the section where a new Timestamp is generated and when it is registered in the
// storage engine.
stdx::mutex newOpMutex;
stdx::condition_variable newTimestampNotifier;
// Remembers that last timestamp generated for creating new oplog entries or last timestamp of
// oplog entry applied as a secondary. This should only be used for the snapshot thread. Must hold
// the newOpMutex when accessing this variable.
Timestamp lastSetTimestamp;
static std::string _oplogCollectionName;
// so we can fail the same way
void checkOplogInsert(Status result) {
massert(17322, str::stream() << "write to oplog failed: " << result.toString(), result.isOK());
}
void _getNextOpTimes(OperationContext* opCtx,
Collection* oplog,
std::size_t count,
OplogSlot* slotsOut,
bool persist = true) {
auto replCoord = ReplicationCoordinator::get(opCtx);
long long term = OpTime::kUninitializedTerm;
// Fetch term out of the newOpMutex.
if (replCoord->getReplicationMode() == ReplicationCoordinator::modeReplSet &&
replCoord->isV1ElectionProtocol()) {
// Current term. If we're not a replset of pv=1, it remains kOldProtocolVersionTerm.
term = replCoord->getTerm();
}
// Allow the storage engine to start the transaction outside the critical section.
opCtx->recoveryUnit()->preallocateSnapshot();
stdx::lock_guard<stdx::mutex> lk(newOpMutex);
auto ts = LogicalClock::get(opCtx)->reserveTicks(count).asTimestamp();
lastSetTimestamp = ts;
newTimestampNotifier.notify_all();
const bool orderedCommit = false;
if (persist) {
fassert(28560, oplog->getRecordStore()->oplogDiskLocRegister(opCtx, ts, orderedCommit));
}
for (std::size_t i = 0; i < count; i++) {
slotsOut[i].opTime = {Timestamp(ts.asULL() + i), term};
slotsOut[i].hash = hashGenerator.nextInt64();
}
}
/**
* This allows us to stream the oplog entry directly into data region
* main goal is to avoid copying the o portion
* which can be very large
* TODO: can have this build the entire doc
*/
class OplogDocWriter final : public DocWriter {
public:
OplogDocWriter(BSONObj frame, BSONObj oField)
: _frame(std::move(frame)), _oField(std::move(oField)) {}
void writeDocument(char* start) const {
char* buf = start;
memcpy(buf, _frame.objdata(), _frame.objsize() - 1); // don't copy final EOO
DataView(buf).write<LittleEndian<int>>(documentSize());
buf += (_frame.objsize() - 1);
buf[0] = (char)Object;
buf[1] = 'o';
buf[2] = 0;
memcpy(buf + 3, _oField.objdata(), _oField.objsize());
buf += 3 + _oField.objsize();
buf[0] = EOO;
verify(static_cast<size_t>((buf + 1) - start) == documentSize()); // DEV?
}
size_t documentSize() const {
return _frame.objsize() + _oField.objsize() + 1 /* type */ + 2 /* "o" */;
}
private:
BSONObj _frame;
BSONObj _oField;
};
} // namespace
void setOplogCollectionName(ServiceContext* service) {
switch (ReplicationCoordinator::get(service)->getReplicationMode()) {
case ReplicationCoordinator::modeReplSet:
_oplogCollectionName = NamespaceString::kRsOplogNamespace.ns();
break;
case ReplicationCoordinator::modeNone:
// leave empty.
break;
}
}
void createIndexForApplyOps(OperationContext* opCtx,
const BSONObj& indexSpec,
const NamespaceString& indexNss,
IncrementOpsAppliedStatsFn incrementOpsAppliedStats,
OplogApplication::Mode mode) {
// Check if collection exists.
Database* db = DatabaseHolder::getDatabaseHolder().get(opCtx, indexNss.ns());
auto indexCollection = db ? db->getCollection(opCtx, indexNss) : nullptr;
uassert(ErrorCodes::NamespaceNotFound,
str::stream() << "Failed to create index due to missing collection: " << indexNss.ns(),
indexCollection);
OpCounters* opCounters = opCtx->writesAreReplicated() ? &globalOpCounters : &replOpCounters;
opCounters->gotInsert();
bool relaxIndexConstraints =
ReplicationCoordinator::get(opCtx)->shouldRelaxIndexConstraints(opCtx, indexNss);
if (indexSpec["background"].trueValue()) {
if (mode == OplogApplication::Mode::kRecovering) {
LOG(3) << "apply op: building background index " << indexSpec
<< " in the foreground because the node is in recovery";
IndexBuilder builder(indexSpec, relaxIndexConstraints);
Status status = builder.buildInForeground(opCtx, db);
uassertStatusOK(status);
} else {
Lock::TempRelease release(opCtx->lockState());
if (opCtx->lockState()->isLocked()) {
// If TempRelease fails, background index build will deadlock.
LOG(3) << "apply op: building background index " << indexSpec
<< " in the foreground because temp release failed";
IndexBuilder builder(indexSpec, relaxIndexConstraints);
Status status = builder.buildInForeground(opCtx, db);
uassertStatusOK(status);
} else {
IndexBuilder* builder = new IndexBuilder(
indexSpec, relaxIndexConstraints, opCtx->recoveryUnit()->getCommitTimestamp());
// This spawns a new thread and returns immediately.
builder->go();
// Wait for thread to start and register itself
IndexBuilder::waitForBgIndexStarting();
}
}
opCtx->recoveryUnit()->abandonSnapshot();
} else {
IndexBuilder builder(indexSpec, relaxIndexConstraints);
Status status = builder.buildInForeground(opCtx, db);
uassertStatusOK(status);
}
if (incrementOpsAppliedStats) {
incrementOpsAppliedStats();
}
getGlobalServiceContext()->getOpObserver()->onCreateIndex(
opCtx, indexNss, indexCollection->uuid(), indexSpec, false);
}
namespace {
/**
* Attaches the session information of a write to an oplog entry if it exists.
*/
void appendSessionInfo(OperationContext* opCtx,
BSONObjBuilder* builder,
StmtId statementId,
const OperationSessionInfo& sessionInfo,
const OplogLink& oplogLink) {
if (!sessionInfo.getTxnNumber()) {
return;
}
// Note: certain operations, like implicit collection creation will not have a stmtId.
if (statementId == kUninitializedStmtId) {
return;
}
sessionInfo.serialize(builder);
builder->append(OplogEntryBase::kStatementIdFieldName, statementId);
oplogLink.prevOpTime.append(builder,
OplogEntryBase::kPrevWriteOpTimeInTransactionFieldName.toString());
if (!oplogLink.preImageOpTime.isNull()) {
oplogLink.preImageOpTime.append(builder,
OplogEntryBase::kPreImageOpTimeFieldName.toString());
}
if (!oplogLink.postImageOpTime.isNull()) {
oplogLink.postImageOpTime.append(builder,
OplogEntryBase::kPostImageOpTimeFieldName.toString());
}
}
OplogDocWriter _logOpWriter(OperationContext* opCtx,
const char* opstr,
const NamespaceString& nss,
OptionalCollectionUUID uuid,
const BSONObj& obj,
const BSONObj* o2,
bool fromMigrate,
OpTime optime,
long long hashNew,
Date_t wallTime,
const OperationSessionInfo& sessionInfo,
StmtId statementId,
const OplogLink& oplogLink) {
BSONObjBuilder b(256);
b.append("ts", optime.getTimestamp());
if (optime.getTerm() != -1)
b.append("t", optime.getTerm());
b.append("h", hashNew);
b.append("v", OplogEntry::kOplogVersion);
b.append("op", opstr);
b.append("ns", nss.ns());
if (uuid)
uuid->appendToBuilder(&b, "ui");
if (fromMigrate)
b.appendBool("fromMigrate", true);
if (o2)
b.append("o2", *o2);
invariant(wallTime != Date_t{});
b.appendDate("wall", wallTime);
appendSessionInfo(opCtx, &b, statementId, sessionInfo, oplogLink);
return OplogDocWriter(OplogDocWriter(b.obj(), obj));
}
} // end anon namespace
/* we write to local.oplog.rs:
{ ts : ..., h: ..., v: ..., op: ..., etc }
ts: an OpTime timestamp
h: hash
v: version
op:
"i" insert
"u" update
"d" delete
"c" db cmd
"n" no op
*/
/*
* writers - an array with size nDocs of DocWriter objects.
* timestamps - an array with size nDocs of respective Timestamp objects for each DocWriter.
* oplogCollection - collection to be written to.
* finalOpTime - the OpTime of the last DocWriter object.
*/
void _logOpsInner(OperationContext* opCtx,
const NamespaceString& nss,
const DocWriter* const* writers,
Timestamp* timestamps,
size_t nDocs,
Collection* oplogCollection,
OpTime finalOpTime) {
auto replCoord = ReplicationCoordinator::get(opCtx);
if (nss.size() && replCoord->getReplicationMode() == ReplicationCoordinator::modeReplSet &&
!replCoord->canAcceptWritesFor(opCtx, nss)) {
uasserted(17405,
str::stream() << "logOp() but can't accept write to collection " << nss.ns());
}
// we jump through a bunch of hoops here to avoid copying the obj buffer twice --
// instead we do a single copy to the destination in the record store.
checkOplogInsert(oplogCollection->insertDocumentsForOplog(opCtx, writers, timestamps, nDocs));
// Set replCoord last optime only after we're sure the WUOW didn't abort and roll back.
opCtx->recoveryUnit()->onCommit(
[opCtx, replCoord, finalOpTime](boost::optional<Timestamp> commitTime) {
if (commitTime) {
// The `finalOpTime` may be less than the `commitTime` if multiple oplog entries
// are logging within one WriteUnitOfWork.
invariant(finalOpTime.getTimestamp() <= *commitTime,
str::stream() << "Final OpTime: " << finalOpTime.toString()
<< ". Commit Time: "
<< commitTime->toString());
}
// Optimes on the primary should always represent consistent database states.
replCoord->setMyLastAppliedOpTimeForward(
finalOpTime, ReplicationCoordinator::DataConsistency::Consistent);
// We set the last op on the client to 'finalOpTime', because that contains the
// timestamp of the operation that the client actually performed.
ReplClientInfo::forClient(opCtx->getClient()).setLastOp(finalOpTime);
});
}
OpTime logOp(OperationContext* opCtx,
const char* opstr,
const NamespaceString& nss,
OptionalCollectionUUID uuid,
const BSONObj& obj,
const BSONObj* o2,
bool fromMigrate,
Date_t wallClockTime,
const OperationSessionInfo& sessionInfo,
StmtId statementId,
const OplogLink& oplogLink) {
auto replCoord = ReplicationCoordinator::get(opCtx);
// For commands, the test below is on the command ns and therefore does not check for
// specific namespaces such as system.profile. This is the caller's responsibility.
if (replCoord->isOplogDisabledFor(opCtx, nss)) {
uassert(ErrorCodes::IllegalOperation,
str::stream() << "retryable writes is not supported for unreplicated ns: "
<< nss.ns(),
statementId == kUninitializedStmtId);
return {};
}
Lock::DBLock lk(opCtx, NamespaceString::kLocalDb, MODE_IX);
Lock::CollectionLock lock(opCtx->lockState(), _oplogCollectionName, MODE_IX);
auto const oplog = _localOplogCollection;
OplogSlot slot;
WriteUnitOfWork wuow(opCtx);
_getNextOpTimes(opCtx, oplog, 1, &slot);
auto writer = _logOpWriter(opCtx,
opstr,
nss,
uuid,
obj,
o2,
fromMigrate,
slot.opTime,
slot.hash,
wallClockTime,
sessionInfo,
statementId,
oplogLink);
const DocWriter* basePtr = &writer;
auto timestamp = slot.opTime.getTimestamp();
_logOpsInner(opCtx, nss, &basePtr, ×tamp, 1, oplog, slot.opTime);
wuow.commit();
return slot.opTime;
}
std::vector<OpTime> logInsertOps(OperationContext* opCtx,
const NamespaceString& nss,
OptionalCollectionUUID uuid,
Session* session,
std::vector<InsertStatement>::const_iterator begin,
std::vector<InsertStatement>::const_iterator end,
bool fromMigrate,
Date_t wallClockTime) {
invariant(begin != end);
auto replCoord = ReplicationCoordinator::get(opCtx);
if (replCoord->isOplogDisabledFor(opCtx, nss)) {
uassert(ErrorCodes::IllegalOperation,
str::stream() << "retryable writes is not supported for unreplicated ns: "
<< nss.ns(),
begin->stmtId == kUninitializedStmtId);
return {};
}
const size_t count = end - begin;
std::vector<OplogDocWriter> writers;
writers.reserve(count);
Collection* oplog = _localOplogCollection;
Lock::DBLock lk(opCtx, "local", MODE_IX);
Lock::CollectionLock lock(opCtx->lockState(), _oplogCollectionName, MODE_IX);
WriteUnitOfWork wuow(opCtx);
OperationSessionInfo sessionInfo;
OplogLink oplogLink;
if (session) {
sessionInfo.setSessionId(*opCtx->getLogicalSessionId());
sessionInfo.setTxnNumber(*opCtx->getTxnNumber());
oplogLink.prevOpTime = session->getLastWriteOpTime(*opCtx->getTxnNumber());
}
auto timestamps = stdx::make_unique<Timestamp[]>(count);
std::vector<OpTime> opTimes;
for (size_t i = 0; i < count; i++) {
// Make a mutable copy.
auto insertStatementOplogSlot = begin[i].oplogSlot;
// Fetch optime now, if not already fetched.
if (insertStatementOplogSlot.opTime.isNull()) {
_getNextOpTimes(opCtx, oplog, 1, &insertStatementOplogSlot);
}
writers.emplace_back(_logOpWriter(opCtx,
"i",
nss,
uuid,
begin[i].doc,
NULL,
fromMigrate,
insertStatementOplogSlot.opTime,
insertStatementOplogSlot.hash,
wallClockTime,
sessionInfo,
begin[i].stmtId,
oplogLink));
oplogLink.prevOpTime = insertStatementOplogSlot.opTime;
timestamps[i] = oplogLink.prevOpTime.getTimestamp();
opTimes.push_back(insertStatementOplogSlot.opTime);
}
MONGO_FAIL_POINT_BLOCK(sleepBetweenInsertOpTimeGenerationAndLogOp, customWait) {
const BSONObj& data = customWait.getData();
auto numMillis = data["waitForMillis"].numberInt();
log() << "Sleeping for " << numMillis << "ms after receiving " << count << " optimes from "
<< opTimes.front() << " to " << opTimes.back();
sleepmillis(numMillis);
}
std::unique_ptr<DocWriter const* []> basePtrs(new DocWriter const*[count]);
for (size_t i = 0; i < count; i++) {
basePtrs[i] = &writers[i];
}
invariant(!opTimes.empty());
auto lastOpTime = opTimes.back();
invariant(!lastOpTime.isNull());
_logOpsInner(opCtx, nss, basePtrs.get(), timestamps.get(), count, oplog, lastOpTime);
wuow.commit();
return opTimes;
}
namespace {
long long getNewOplogSizeBytes(OperationContext* opCtx, const ReplSettings& replSettings) {
if (replSettings.getOplogSizeBytes() != 0) {
return replSettings.getOplogSizeBytes();
}
/* not specified. pick a default size */
ProcessInfo pi;
if (pi.getAddrSize() == 32) {
const auto sz = 50LL * 1024LL * 1024LL;
LOG(3) << "32bit system; choosing " << sz << " bytes oplog";
return sz;
}
// First choose a minimum size.
#if defined(__APPLE__)
// typically these are desktops (dev machines), so keep it smallish
const auto sz = 192 * 1024 * 1024;
LOG(3) << "Apple system; choosing " << sz << " bytes oplog";
return sz;
#else
long long lowerBound = 0;
double bytes = 0;
if (opCtx->getClient()->getServiceContext()->getStorageEngine()->isEphemeral()) {
// in memory: 50MB minimum size
lowerBound = 50LL * 1024 * 1024;
bytes = pi.getMemSizeMB() * 1024 * 1024;
LOG(3) << "Ephemeral storage system; lowerBound: " << lowerBound << " bytes, " << bytes
<< " bytes total memory";
} else {
// disk: 990MB minimum size
lowerBound = 990LL * 1024 * 1024;
bytes = File::freeSpace(storageGlobalParams.dbpath); //-1 if call not supported.
LOG(3) << "Disk storage system; lowerBound: " << lowerBound << " bytes, " << bytes
<< " bytes free space on device";
}
long long fivePct = static_cast<long long>(bytes * 0.05);
auto sz = std::max(fivePct, lowerBound);
// we use 5% of free [disk] space up to 50GB (1TB free)
const long long upperBound = 50LL * 1024 * 1024 * 1024;
sz = std::min(sz, upperBound);
return sz;
#endif
}
} // namespace
void createOplog(OperationContext* opCtx, const std::string& oplogCollectionName, bool isReplSet) {
Lock::GlobalWrite lk(opCtx);
const ReplSettings& replSettings = ReplicationCoordinator::get(opCtx)->getSettings();
OldClientContext ctx(opCtx, oplogCollectionName);
Collection* collection = ctx.db()->getCollection(opCtx, oplogCollectionName);
if (collection) {
if (replSettings.getOplogSizeBytes() != 0) {
const CollectionOptions oplogOpts =
collection->getCatalogEntry()->getCollectionOptions(opCtx);
int o = (int)(oplogOpts.cappedSize / (1024 * 1024));
int n = (int)(replSettings.getOplogSizeBytes() / (1024 * 1024));
if (n != o) {
stringstream ss;
ss << "cmdline oplogsize (" << n << ") different than existing (" << o
<< ") see: http://dochub.mongodb.org/core/increase-oplog";
log() << ss.str() << endl;
uasserted(13257, ss.str());
}
}
acquireOplogCollectionForLogging(opCtx);
if (!isReplSet)
initTimestampFromOplog(opCtx, oplogCollectionName);
return;
}
/* create an oplog collection, if it doesn't yet exist. */
const auto sz = getNewOplogSizeBytes(opCtx, replSettings);
log() << "******" << endl;
log() << "creating replication oplog of size: " << (int)(sz / (1024 * 1024)) << "MB..." << endl;
CollectionOptions options;
options.capped = true;
options.cappedSize = sz;
options.autoIndexId = CollectionOptions::NO;
writeConflictRetry(opCtx, "createCollection", oplogCollectionName, [&] {
WriteUnitOfWork uow(opCtx);
invariant(ctx.db()->createCollection(opCtx, oplogCollectionName, options));
acquireOplogCollectionForLogging(opCtx);
if (!isReplSet) {
opCtx->getServiceContext()->getOpObserver()->onOpMessage(opCtx, BSONObj());
}
uow.commit();
});
/* sync here so we don't get any surprising lag later when we try to sync */
StorageEngine* storageEngine = getGlobalServiceContext()->getStorageEngine();
storageEngine->flushAllFiles(opCtx, true);
log() << "******" << endl;
}
void createOplog(OperationContext* opCtx) {
const auto isReplSet = ReplicationCoordinator::get(opCtx)->getReplicationMode() ==
ReplicationCoordinator::modeReplSet;
createOplog(opCtx, _oplogCollectionName, isReplSet);
}
OplogSlot getNextOpTime(OperationContext* opCtx) {
// The local oplog collection pointer must already be established by this point.
// We can't establish it here because that would require locking the local database, which would
// be a lock order violation.
invariant(_localOplogCollection);
OplogSlot os;
_getNextOpTimes(opCtx, _localOplogCollection, 1, &os);
return os;
}
OplogSlot getNextOpTimeNoPersistForTesting(OperationContext* opCtx) {
invariant(_localOplogCollection);
OplogSlot os;
bool persist = false; // Don't update the storage engine with the allocated OpTime.
_getNextOpTimes(opCtx, _localOplogCollection, 1, &os, persist);
return os;
}
std::vector<OplogSlot> getNextOpTimes(OperationContext* opCtx, std::size_t count) {
// The local oplog collection pointer must already be established by this point.
// We can't establish it here because that would require locking the local database, which would
// be a lock order violation.
invariant(_localOplogCollection);
std::vector<OplogSlot> oplogSlots(count);
auto oplogSlot = oplogSlots.begin();
_getNextOpTimes(opCtx, _localOplogCollection, count, &(*oplogSlot));
return oplogSlots;
}
// -------------------------------------
namespace {
NamespaceString parseNs(const string& ns, const BSONObj& cmdObj) {
BSONElement first = cmdObj.firstElement();
uassert(40073,
str::stream() << "collection name has invalid type " << typeName(first.type()),
first.canonicalType() == canonicalizeBSONType(mongo::String));
std::string coll = first.valuestr();
uassert(28635, "no collection name specified", !coll.empty());
return NamespaceString(NamespaceString(ns).db().toString(), coll);
}
std::pair<OptionalCollectionUUID, NamespaceString> parseCollModUUIDAndNss(OperationContext* opCtx,
const BSONElement& ui,
const char* ns,
BSONObj& cmd) {
if (ui.eoo()) {
return std::pair<OptionalCollectionUUID, NamespaceString>(boost::none, parseNs(ns, cmd));
}
CollectionUUID uuid = uassertStatusOK(UUID::parse(ui));
auto& catalog = UUIDCatalog::get(opCtx);
const auto nsByUUID = catalog.lookupNSSByUUID(uuid);
uassert(ErrorCodes::NamespaceNotFound,
str::stream() << "Failed to apply operation due to missing collection (" << uuid
<< "): "
<< redact(cmd.toString()),
!nsByUUID.isEmpty());
return std::pair<OptionalCollectionUUID, NamespaceString>(uuid, nsByUUID);
}
NamespaceString parseUUID(OperationContext* opCtx, const BSONElement& ui) {
auto statusWithUUID = UUID::parse(ui);
uassertStatusOK(statusWithUUID);
auto uuid = statusWithUUID.getValue();
auto& catalog = UUIDCatalog::get(opCtx);
auto nss = catalog.lookupNSSByUUID(uuid);
uassert(
ErrorCodes::NamespaceNotFound, "No namespace with UUID " + uuid.toString(), !nss.isEmpty());
return nss;
}
NamespaceString parseUUIDorNs(OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd) {
return ui.ok() ? parseUUID(opCtx, ui) : parseNs(ns, cmd);
}
using OpApplyFn = stdx::function<Status(OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode)>;
struct ApplyOpMetadata {
OpApplyFn applyFunc;
std::set<ErrorCodes::Error> acceptableErrors;
ApplyOpMetadata(OpApplyFn fun) {
applyFunc = fun;
}
ApplyOpMetadata(OpApplyFn fun, std::set<ErrorCodes::Error> theAcceptableErrors) {
applyFunc = fun;
acceptableErrors = theAcceptableErrors;
}
};
std::map<std::string, ApplyOpMetadata> opsMap = {
{"create",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
const NamespaceString nss(parseNs(ns, cmd));
if (auto idIndexElem = cmd["idIndex"]) {
// Remove "idIndex" field from command.
auto cmdWithoutIdIndex = cmd.removeField("idIndex");
return createCollectionForApplyOps(
opCtx, nss.db().toString(), ui, cmdWithoutIdIndex, idIndexElem.Obj());
}
// No _id index spec was provided, so we should build a v:1 _id index.
BSONObjBuilder idIndexSpecBuilder;
idIndexSpecBuilder.append(IndexDescriptor::kIndexVersionFieldName,
static_cast<int>(IndexVersion::kV1));
idIndexSpecBuilder.append(IndexDescriptor::kIndexNameFieldName, "_id_");
idIndexSpecBuilder.append(IndexDescriptor::kNamespaceFieldName, nss.ns());
idIndexSpecBuilder.append(IndexDescriptor::kKeyPatternFieldName, BSON("_id" << 1));
return createCollectionForApplyOps(
opCtx, nss.db().toString(), ui, cmd, idIndexSpecBuilder.done());
},
{ErrorCodes::NamespaceExists}}},
{"createIndexes",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
const NamespaceString nss(parseUUID(opCtx, ui));
BSONElement first = cmd.firstElement();
invariant(first.fieldNameStringData() == "createIndexes");
uassert(ErrorCodes::InvalidNamespace,
"createIndexes value must be a string",
first.type() == mongo::String);
BSONObj indexSpec = cmd.removeField("createIndexes");
// The UUID determines the collection to build the index on, so create new 'ns' field.
BSONObj nsObj = BSON("ns" << nss.ns());
indexSpec = indexSpec.addField(nsObj.firstElement());
createIndexForApplyOps(opCtx, indexSpec, nss, {}, mode);
return Status::OK();
},
{ErrorCodes::IndexAlreadyExists, ErrorCodes::NamespaceNotFound}}},
{"collMod",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
NamespaceString nss;
std::tie(std::ignore, nss) = parseCollModUUIDAndNss(opCtx, ui, ns, cmd);
// The collMod for apply ops could be either a user driven collMod or a collMod triggered
// by an upgrade.
return collModWithUpgrade(opCtx, nss, cmd);
},
{ErrorCodes::IndexNotFound, ErrorCodes::NamespaceNotFound}}},
{"dbCheck", {dbCheckOplogCommand, {}}},
{"dropDatabase",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
return dropDatabase(opCtx, NamespaceString(ns).db().toString());
},
{ErrorCodes::NamespaceNotFound}}},
{"drop",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
BSONObjBuilder resultWeDontCareAbout;
auto nss = parseUUIDorNs(opCtx, ns, ui, cmd);
if (nss.isDropPendingNamespace()) {
log()
<< "applyCommand: " << nss << " (UUID: " << ui.toString(false)
<< "): collection is already in a drop-pending state: ignoring collection drop: "
<< redact(cmd);
return Status::OK();
}
return dropCollection(opCtx,
nss,
resultWeDontCareAbout,
opTime,
DropCollectionSystemCollectionMode::kAllowSystemCollectionDrops);
},
{ErrorCodes::NamespaceNotFound}}},
// deleteIndex(es) is deprecated but still works as of April 10, 2015
{"deleteIndex",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
BSONObjBuilder resultWeDontCareAbout;
return dropIndexes(opCtx, parseUUIDorNs(opCtx, ns, ui, cmd), cmd, &resultWeDontCareAbout);
},
{ErrorCodes::NamespaceNotFound, ErrorCodes::IndexNotFound}}},
{"deleteIndexes",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
BSONObjBuilder resultWeDontCareAbout;
return dropIndexes(opCtx, parseUUIDorNs(opCtx, ns, ui, cmd), cmd, &resultWeDontCareAbout);
},
{ErrorCodes::NamespaceNotFound, ErrorCodes::IndexNotFound}}},
{"dropIndex",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
BSONObjBuilder resultWeDontCareAbout;
return dropIndexes(opCtx, parseUUIDorNs(opCtx, ns, ui, cmd), cmd, &resultWeDontCareAbout);
},
{ErrorCodes::NamespaceNotFound, ErrorCodes::IndexNotFound}}},
{"dropIndexes",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
BSONObjBuilder resultWeDontCareAbout;
return dropIndexes(opCtx, parseUUIDorNs(opCtx, ns, ui, cmd), cmd, &resultWeDontCareAbout);
},
{ErrorCodes::NamespaceNotFound, ErrorCodes::IndexNotFound}}},
{"renameCollection",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
return renameCollectionForApplyOps(opCtx, nsToDatabase(ns), ui, cmd, opTime);
},
{ErrorCodes::NamespaceNotFound, ErrorCodes::NamespaceExists}}},
{"applyOps",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
BSONObjBuilder resultWeDontCareAbout;
return applyOps(opCtx, nsToDatabase(ns), cmd, mode, &resultWeDontCareAbout);
}}},
{"convertToCapped",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
return convertToCapped(opCtx, parseUUIDorNs(opCtx, ns, ui, cmd), cmd["size"].number());
}}},
{"emptycapped",
{[](OperationContext* opCtx,
const char* ns,
const BSONElement& ui,
BSONObj& cmd,
const OpTime& opTime,
OplogApplication::Mode mode) -> Status {
return emptyCapped(opCtx, parseUUIDorNs(opCtx, ns, ui, cmd));
}}},
};
} // namespace
constexpr StringData OplogApplication::kInitialSyncOplogApplicationMode;
constexpr StringData OplogApplication::kRecoveringOplogApplicationMode;
constexpr StringData OplogApplication::kSecondaryOplogApplicationMode;
constexpr StringData OplogApplication::kApplyOpsCmdOplogApplicationMode;
StringData OplogApplication::modeToString(OplogApplication::Mode mode) {
switch (mode) {
case OplogApplication::Mode::kInitialSync:
return OplogApplication::kInitialSyncOplogApplicationMode;
case OplogApplication::Mode::kRecovering:
return OplogApplication::kRecoveringOplogApplicationMode;
case OplogApplication::Mode::kSecondary:
return OplogApplication::kSecondaryOplogApplicationMode;
case OplogApplication::Mode::kApplyOpsCmd:
return OplogApplication::kApplyOpsCmdOplogApplicationMode;
}
MONGO_UNREACHABLE;
}
StatusWith<OplogApplication::Mode> OplogApplication::parseMode(const std::string& mode) {
if (mode == OplogApplication::kInitialSyncOplogApplicationMode) {
return OplogApplication::Mode::kInitialSync;
} else if (mode == OplogApplication::kRecoveringOplogApplicationMode) {
return OplogApplication::Mode::kRecovering;
} else if (mode == OplogApplication::kSecondaryOplogApplicationMode) {
return OplogApplication::Mode::kSecondary;
} else if (mode == OplogApplication::kApplyOpsCmdOplogApplicationMode) {
return OplogApplication::Mode::kApplyOpsCmd;
} else {
return Status(ErrorCodes::FailedToParse,
str::stream() << "Invalid oplog application mode provided: " << mode);
}
MONGO_UNREACHABLE;
}
std::pair<BSONObj, NamespaceString> prepForApplyOpsIndexInsert(const BSONElement& fieldO,
const BSONObj& op,
const NamespaceString& requestNss) {
uassert(ErrorCodes::NoSuchKey,
str::stream() << "Missing expected index spec in field 'o': " << op,
!fieldO.eoo());
uassert(ErrorCodes::TypeMismatch,
str::stream() << "Expected object for index spec in field 'o': " << op,
fieldO.isABSONObj());
BSONObj indexSpec = fieldO.embeddedObject();
std::string indexNs;
uassertStatusOK(bsonExtractStringField(indexSpec, "ns", &indexNs));
const NamespaceString indexNss(indexNs);
uassert(ErrorCodes::InvalidNamespace,
str::stream() << "Invalid namespace in index spec: " << op,
indexNss.isValid());
uassert(ErrorCodes::InvalidNamespace,
str::stream() << "Database name mismatch for database (" << requestNss.db()
<< ") while creating index: "
<< op,
requestNss.db() == indexNss.db());
if (!indexSpec["v"]) {
// If the "v" field isn't present in the index specification, then we assume it is a
// v=1 index from an older version of MongoDB. This is because
// (1) we haven't built v=0 indexes as the default for a long time, and
// (2) the index version has been included in the corresponding oplog entry since
// v=2 indexes were introduced.
BSONObjBuilder bob;
bob.append("v", static_cast<int>(IndexVersion::kV1));
bob.appendElements(indexSpec);
indexSpec = bob.obj();
}
return std::make_pair(indexSpec, indexNss);
}
// @return failure status if an update should have happened and the document DNE.
// See replset initial sync code.
Status applyOperation_inlock(OperationContext* opCtx,
Database* db,
const BSONObj& op,
bool alwaysUpsert,
OplogApplication::Mode mode,
IncrementOpsAppliedStatsFn incrementOpsAppliedStats) {
LOG(3) << "applying op: " << redact(op)
<< ", oplog application mode: " << OplogApplication::modeToString(mode);
OpCounters* opCounters = opCtx->writesAreReplicated() ? &globalOpCounters : &replOpCounters;
std::array<StringData, 8> names = {"ts", "t", "o", "ui", "ns", "op", "b", "o2"};
std::array<BSONElement, 8> fields;
op.getFields(names, &fields);
BSONElement& fieldTs = fields[0];
BSONElement& fieldT = fields[1];
BSONElement& fieldO = fields[2];
BSONElement& fieldUI = fields[3];
BSONElement& fieldNs = fields[4];
BSONElement& fieldOp = fields[5];
BSONElement& fieldB = fields[6];
BSONElement& fieldO2 = fields[7];
BSONObj o;
if (fieldO.isABSONObj())
o = fieldO.embeddedObject();
// operation type -- see logOp() comments for types
const char* opType = fieldOp.valuestrsafe();
if (*opType == 'n') {
// no op
if (incrementOpsAppliedStats) {
incrementOpsAppliedStats();
}
return Status::OK();
}
NamespaceString requestNss;
Collection* collection = nullptr;
if (fieldUI) {
UUIDCatalog& catalog = UUIDCatalog::get(opCtx);
auto uuid = uassertStatusOK(UUID::parse(fieldUI));
collection = catalog.lookupCollectionByUUID(uuid);
uassert(ErrorCodes::NamespaceNotFound,
str::stream() << "Failed to apply operation due to missing collection (" << uuid
<< "): "
<< redact(op.toString()),
collection);
requestNss = collection->ns();
dassert(opCtx->lockState()->isCollectionLockedForMode(
requestNss.ns(), supportsDocLocking() ? MODE_IX : MODE_X),
requestNss.ns());
} else {
uassert(ErrorCodes::InvalidNamespace,
"'ns' must be of type String",
fieldNs.type() == BSONType::String);
const StringData ns = fieldNs.valuestrsafe();
requestNss = NamespaceString(ns);
if (nsIsFull(ns)) {
if (supportsDocLocking()) {
// WiredTiger, and others requires MODE_IX since the applier threads driving
// this allow writes to the same collection on any thread.
dassert(opCtx->lockState()->isCollectionLockedForMode(ns, MODE_IX),
requestNss.ns());
} else {
// mmapV1 ensures that all operations to the same collection are executed from
// the same worker thread, so it takes an exclusive lock (MODE_X)
dassert(opCtx->lockState()->isCollectionLockedForMode(ns, MODE_X), requestNss.ns());
}
}
collection = db->getCollection(opCtx, requestNss);
}
// The feature compatibility version in the server configuration collection must not change
// during initial sync.
if ((mode == OplogApplication::Mode::kInitialSync) &&
requestNss == NamespaceString::kServerConfigurationNamespace) {
std::string oID;
auto status = bsonExtractStringField(o, "_id", &oID);
if (status.isOK() && oID == FeatureCompatibilityVersionParser::kParameterName) {
return Status(ErrorCodes::OplogOperationUnsupported,
str::stream() << "Applying operation on feature compatibility version "
"document not supported in initial sync: "
<< redact(op));
}
}
BSONObj o2;
if (fieldO2.isABSONObj())
o2 = fieldO2.Obj();
bool valueB = fieldB.booleanSafe();
IndexCatalog* indexCatalog = collection == nullptr ? nullptr : collection->getIndexCatalog();
const bool haveWrappingWriteUnitOfWork = opCtx->lockState()->inAWriteUnitOfWork();
uassert(ErrorCodes::CommandNotSupportedOnView,
str::stream() << "applyOps not supported on view: " << requestNss.ns(),
collection || !db->getViewCatalog()->lookup(opCtx, requestNss.ns()));
// This code must decide what timestamp the storage engine should make the upcoming writes
// visible with. The requirements and use-cases:
//
// Requirement: A client calling the `applyOps` command must not be able to dictate timestamps
// that violate oplog ordering. Disallow this regardless of whether the timestamps chosen
// are otherwise legal.
//
// Use cases:
// Secondary oplog application: Use the timestamp in the operation document. These
// operations are replicated to the oplog and this is not nested in a parent
// `WriteUnitOfWork`.
//
// Non-atomic `applyOps`: The server receives an `applyOps` command with a series of
// operations that cannot be run under a single transaction. The common exemption from
// being "transactionable" is containing a command operation. These will not be under a
// parent `WriteUnitOfWork`. We do not use the timestamps provided by the operations; if
// replicated, these operations will be assigned timestamps when logged in the oplog.
//
// Atomic `applyOps`: The server receives an `applyOps` command with operations that can be
// run under a single transaction. In this case the caller has already opened a
// `WriteUnitOfWork` and expects all writes to become visible at the same time. Moreover,
// the individual operations will not contain a `ts` field. The caller is responsible for
// setting the timestamp before committing. Assigning a competing timestamp in this
// codepath would break that atomicity. Sharding is a consumer of this use-case.
const bool assignOperationTimestamp = [opCtx, haveWrappingWriteUnitOfWork, mode] {
const auto replMode = ReplicationCoordinator::get(opCtx)->getReplicationMode();
if (opCtx->writesAreReplicated()) {
// We do not assign timestamps on replicated writes since they will get their oplog
// timestamp once they are logged.
return false;
} else {
switch (replMode) {
case ReplicationCoordinator::modeReplSet: {
if (haveWrappingWriteUnitOfWork) {
// We do not assign timestamps to non-replicated writes that have a wrapping
// WUOW. These must be operations inside of atomic 'applyOps' commands being
// applied on a secondary. They will get the timestamp of the outer
// 'applyOps' oplog entry in their wrapper WUOW.
return false;
}
break;
}
case ReplicationCoordinator::modeNone: {
// Only assign timestamps on standalones during replication recovery when
// started with 'recoverFromOplogAsStandalone'.
return mode == OplogApplication::Mode::kRecovering;
}
}
}
return true;
}();
invariant(!assignOperationTimestamp || !fieldTs.eoo(),
str::stream() << "Oplog entry did not have 'ts' field when expected: " << redact(op));
if (*opType == 'i') {
if (requestNss.isSystemDotIndexes()) {
BSONObj indexSpec;
NamespaceString indexNss;
std::tie(indexSpec, indexNss) =
repl::prepForApplyOpsIndexInsert(fieldO, op, requestNss);
createIndexForApplyOps(opCtx, indexSpec, indexNss, incrementOpsAppliedStats, mode);
return Status::OK();
}
uassert(ErrorCodes::NamespaceNotFound,
str::stream() << "Failed to apply insert due to missing collection: "
<< op.toString(),
collection);
if (fieldO.type() == Array) {
// Batched inserts.
// Cannot apply an array insert with applyOps command. No support for wiping out
// the provided timestamps and using new ones for oplog.
uassert(ErrorCodes::OperationFailed,
"Cannot apply an array insert with applyOps",
!opCtx->writesAreReplicated());
uassert(ErrorCodes::BadValue,
"Expected array for field 'ts'",
fieldTs.ok() && fieldTs.type() == Array);
uassert(ErrorCodes::BadValue,
"Expected array for field 't'",
fieldT.ok() && fieldT.type() == Array);
uassert(ErrorCodes::OperationFailed,
str::stream() << "Failed to apply insert due to empty array element: "
<< op.toString(),
!fieldO.Obj().isEmpty() && !fieldTs.Obj().isEmpty() && !fieldT.Obj().isEmpty());
std::vector<InsertStatement> insertObjs;
auto fieldOIt = BSONObjIterator(fieldO.Obj());
auto fieldTsIt = BSONObjIterator(fieldTs.Obj());
auto fieldTIt = BSONObjIterator(fieldT.Obj());
while (true) {
auto oElem = fieldOIt.next();
auto tsElem = fieldTsIt.next();
auto tElem = fieldTIt.next();
// Note: we don't care about statement ids here since the secondaries don't create
// their own oplog entries.
insertObjs.emplace_back(oElem.Obj(), tsElem.timestamp(), tElem.Long());
if (!fieldOIt.more()) {
// Make sure arrays are the same length.
uassert(ErrorCodes::OperationFailed,
str::stream()
<< "Failed to apply insert due to invalid array elements: "
<< op.toString(),
!fieldTsIt.more());
break;
}
// Make sure arrays are the same length.
uassert(ErrorCodes::OperationFailed,
str::stream() << "Failed to apply insert due to invalid array elements: "
<< op.toString(),
fieldTsIt.more());
}
WriteUnitOfWork wuow(opCtx);
OpDebug* const nullOpDebug = nullptr;
Status status = collection->insertDocuments(
opCtx, insertObjs.begin(), insertObjs.end(), nullOpDebug, true);
if (!status.isOK()) {
return status;
}
wuow.commit();
for (auto entry : insertObjs) {
opCounters->gotInsert();
if (incrementOpsAppliedStats) {
incrementOpsAppliedStats();
}
}
} else {
// Single insert.
opCounters->gotInsert();
// No _id.
// This indicates an issue with the upstream server:
// The oplog entry is corrupted; or
// The version of the upstream server is obsolete.
uassert(ErrorCodes::NoSuchKey,
str::stream() << "Failed to apply insert due to missing _id: " << op.toString(),
o.hasField("_id"));
// 1. Try insert first, if we have no wrappingWriteUnitOfWork
// 2. If okay, commit
// 3. If not, do upsert (and commit)
// 4. If both !Ok, return status
// We cannot rely on a DuplicateKey error if we're part of a larger transaction,
// because that would require the transaction to abort. So instead, use upsert in that
// case.
bool needToDoUpsert = haveWrappingWriteUnitOfWork;
Timestamp timestamp;
long long term = OpTime::kUninitializedTerm;
if (assignOperationTimestamp) {
if (fieldTs) {
timestamp = fieldTs.timestamp();
}
if (fieldT) {
term = fieldT.Long();
}
}
if (!needToDoUpsert) {
WriteUnitOfWork wuow(opCtx);
// Do not use supplied timestamps if running through applyOps, as that would allow
// a user to dictate what timestamps appear in the oplog.
if (assignOperationTimestamp) {
if (fieldTs.ok()) {
timestamp = fieldTs.timestamp();
}
if (fieldT.ok()) {
term = fieldT.Long();
}
}
OpDebug* const nullOpDebug = nullptr;
Status status = collection->insertDocument(
opCtx, InsertStatement(o, timestamp, term), nullOpDebug, true);
if (status.isOK()) {
wuow.commit();
} else if (status == ErrorCodes::DuplicateKey) {
needToDoUpsert = true;
} else {
return status;
}
}
// Now see if we need to do an upsert.
if (needToDoUpsert) {
// Do update on DuplicateKey errors.
// This will only be on the _id field in replication,
// since we disable non-_id unique constraint violations.
BSONObjBuilder b;
b.append(o.getField("_id"));
UpdateRequest request(requestNss);
request.setQuery(b.done());
request.setUpdates(o);
request.setUpsert();
request.setFromOplogApplication(true);
UpdateLifecycleImpl updateLifecycle(requestNss);
request.setLifecycle(&updateLifecycle);
const StringData ns = fieldNs.valuestrsafe();
writeConflictRetry(opCtx, "applyOps_upsert", ns, [&] {
WriteUnitOfWork wuow(opCtx);
// If this is an atomic applyOps (i.e: `haveWrappingWriteUnitOfWork` is true),
// do not timestamp the write.
if (assignOperationTimestamp && timestamp != Timestamp::min()) {
uassertStatusOK(opCtx->recoveryUnit()->setTimestamp(timestamp));
}
UpdateResult res = update(opCtx, db, request);
if (res.numMatched == 0 && res.upserted.isEmpty()) {
error() << "No document was updated even though we got a DuplicateKey "
"error when inserting";
fassertFailedNoTrace(28750);
}
wuow.commit();
});
}
if (incrementOpsAppliedStats) {
incrementOpsAppliedStats();
}
}
} else if (*opType == 'u') {
opCounters->gotUpdate();
auto idField = o2["_id"];
uassert(ErrorCodes::NoSuchKey,
str::stream() << "Failed to apply update due to missing _id: " << op.toString(),
!idField.eoo());
// The o2 field may contain additional fields besides the _id (like the shard key fields),
// but we want to do the update by just _id so we can take advantage of the IDHACK.
BSONObj updateCriteria = idField.wrap();
const bool upsert = valueB || alwaysUpsert;
UpdateRequest request(requestNss);
request.setQuery(updateCriteria);
request.setUpdates(o);
request.setUpsert(upsert);
request.setFromOplogApplication(true);
UpdateLifecycleImpl updateLifecycle(requestNss);
request.setLifecycle(&updateLifecycle);
Timestamp timestamp;
if (assignOperationTimestamp) {
timestamp = fieldTs.timestamp();
}
const StringData ns = fieldNs.valuestrsafe();
auto status = writeConflictRetry(opCtx, "applyOps_update", ns, [&] {
WriteUnitOfWork wuow(opCtx);
if (timestamp != Timestamp::min()) {
uassertStatusOK(opCtx->recoveryUnit()->setTimestamp(timestamp));
}
UpdateResult ur = update(opCtx, db, request);
if (ur.numMatched == 0 && ur.upserted.isEmpty()) {
if (ur.modifiers) {
if (updateCriteria.nFields() == 1) {
// was a simple { _id : ... } update criteria
string msg = str::stream() << "failed to apply update: " << redact(op);
error() << msg;
return Status(ErrorCodes::UpdateOperationFailed, msg);
}
// Need to check to see if it isn't present so we can exit early with a
// failure. Note that adds some overhead for this extra check in some cases,
// such as an updateCriteria of the form
// { _id:..., { x : {$size:...} }
// thus this is not ideal.
if (collection == NULL ||
(indexCatalog->haveIdIndex(opCtx) &&
Helpers::findById(opCtx, collection, updateCriteria).isNull()) ||
// capped collections won't have an _id index
(!indexCatalog->haveIdIndex(opCtx) &&
Helpers::findOne(opCtx, collection, updateCriteria, false).isNull())) {
string msg = str::stream() << "couldn't find doc: " << redact(op);
error() << msg;
return Status(ErrorCodes::UpdateOperationFailed, msg);
}
// Otherwise, it's present; zero objects were updated because of additional
// specifiers in the query for idempotence
} else {
// this could happen benignly on an oplog duplicate replay of an upsert
// (because we are idempotent),
// if an regular non-mod update fails the item is (presumably) missing.
if (!upsert) {
string msg = str::stream() << "update of non-mod failed: " << redact(op);
error() << msg;
return Status(ErrorCodes::UpdateOperationFailed, msg);
}
}
}
wuow.commit();
return Status::OK();
});
if (!status.isOK()) {
return status;
}
if (incrementOpsAppliedStats) {
incrementOpsAppliedStats();
}
} else if (*opType == 'd') {
opCounters->gotDelete();
auto idField = o["_id"];
uassert(ErrorCodes::NoSuchKey,
str::stream() << "Failed to apply delete due to missing _id: " << op.toString(),
!idField.eoo());
// The o field may contain additional fields besides the _id (like the shard key fields),
// but we want to do the delete by just _id so we can take advantage of the IDHACK.
BSONObj deleteCriteria = idField.wrap();
Timestamp timestamp;
if (assignOperationTimestamp) {
timestamp = fieldTs.timestamp();
}
const StringData ns = fieldNs.valuestrsafe();
writeConflictRetry(opCtx, "applyOps_delete", ns, [&] {
WriteUnitOfWork wuow(opCtx);
if (timestamp != Timestamp::min()) {
uassertStatusOK(opCtx->recoveryUnit()->setTimestamp(timestamp));
}
if (opType[1] == 0) {
const auto justOne = true;
deleteObjects(opCtx, collection, requestNss, deleteCriteria, justOne);
} else
verify(opType[1] == 'b'); // "db" advertisement
wuow.commit();
});
if (incrementOpsAppliedStats) {
incrementOpsAppliedStats();
}
} else {
invariant(*opType != 'c'); // commands are processed in applyCommand_inlock()
uasserted(14825, str::stream() << "error in applyOperation : unknown opType " << *opType);
}
return Status::OK();
}
Status applyCommand_inlock(OperationContext* opCtx,
const BSONObj& op,
OplogApplication::Mode mode) {
LOG(3) << "applying command op: " << redact(op)
<< ", oplog application mode: " << OplogApplication::modeToString(mode);
std::array<StringData, 4> names = {"o", "ui", "ns", "op"};
std::array<BSONElement, 4> fields;
op.getFields(names, &fields);
BSONElement& fieldO = fields[0];
BSONElement& fieldUI = fields[1];
BSONElement& fieldNs = fields[2];
BSONElement& fieldOp = fields[3];
const char* opType = fieldOp.valuestrsafe();
invariant(*opType == 'c'); // only commands are processed here
if (fieldO.eoo()) {
return Status(ErrorCodes::NoSuchKey, "Missing expected field 'o'");
}
if (!fieldO.isABSONObj()) {
return Status(ErrorCodes::BadValue, "Expected object for field 'o'");
}
BSONObj o = fieldO.embeddedObject();
uassert(ErrorCodes::InvalidNamespace,
"'ns' must be of type String",
fieldNs.type() == BSONType::String);
const NamespaceString nss(fieldNs.valueStringData());
if (!nss.isValid()) {
return {ErrorCodes::InvalidNamespace, "invalid ns: " + std::string(nss.ns())};
}
{
Database* db = DatabaseHolder::getDatabaseHolder().get(opCtx, nss.ns());
if (db && !db->getCollection(opCtx, nss) && db->getViewCatalog()->lookup(opCtx, nss.ns())) {
return {ErrorCodes::CommandNotSupportedOnView,
str::stream() << "applyOps not supported on view:" << nss.ns()};
}
}
// The feature compatibility version in the server configuration collection cannot change during
// initial sync.
// We do not attempt to parse the whitelisted ops because they do not have a collection
// namespace. If we drop the 'admin' database we will also log a 'drop' oplog entry for each
// collection dropped. 'applyOps' will try to apply each individual operation, and those
// will be caught then if they are a problem.
auto whitelistedOps = std::vector<std::string>{"dropDatabase", "applyOps", "dbCheck"};
if ((mode == OplogApplication::Mode::kInitialSync) &&
(std::find(whitelistedOps.begin(), whitelistedOps.end(), o.firstElementFieldName()) ==
whitelistedOps.end()) &&
parseNs(nss.ns(), o) == NamespaceString::kServerConfigurationNamespace) {
return Status(ErrorCodes::OplogOperationUnsupported,
str::stream() << "Applying command to feature compatibility version "
"collection not supported in initial sync: "
<< redact(op));
}
// Applying commands in repl is done under Global W-lock, so it is safe to not
// perform the current DB checks after reacquiring the lock.
invariant(opCtx->lockState()->isW());
// Parse optime from oplog entry unless we are applying this command in standalone or on a
// primary (replicated writes enabled).
OpTime opTime;
if (!opCtx->writesAreReplicated()) {
auto opTimeResult = OpTime::parseFromOplogEntry(op);
if (opTimeResult.isOK()) {
opTime = opTimeResult.getValue();
}
}
const bool assignCommandTimestamp = [opCtx, mode] {
const auto replMode = ReplicationCoordinator::get(opCtx)->getReplicationMode();
if (opCtx->writesAreReplicated()) {
// We do not assign timestamps on replicated writes since they will get their oplog
// timestamp once they are logged.
return false;
} else {
switch (replMode) {
case ReplicationCoordinator::modeReplSet: {
// The 'applyOps' command never logs 'applyOps' oplog entries with nested
// command operations, so this code will never be run from inside the 'applyOps'
// command on secondaries. Thus, the timestamps in the command oplog
// entries are always real timestamps from this oplog and we should
// timestamp our writes with them.
return true;
}
case ReplicationCoordinator::modeNone: {
// Only assign timestamps on standalones during replication recovery when
// started with 'recoverFromOplogAsStandalone'.
return mode == OplogApplication::Mode::kRecovering;
}
}
MONGO_UNREACHABLE;
}
}();
invariant(!assignCommandTimestamp || !opTime.isNull(),
str::stream() << "Oplog entry did not have 'ts' field when expected: " << redact(op));
const Timestamp writeTime = (assignCommandTimestamp ? opTime.getTimestamp() : Timestamp());
bool done = false;
while (!done) {
auto op = opsMap.find(o.firstElementFieldName());
if (op == opsMap.end()) {
return Status(ErrorCodes::BadValue,
mongoutils::str::stream() << "Invalid key '" << o.firstElementFieldName()
<< "' found in field 'o'");
}
ApplyOpMetadata curOpToApply = op->second;
Status status = Status::OK();
try {
// If 'writeTime' is not null, any writes in this scope will be given 'writeTime' as
// their timestamp at commit.
TimestampBlock tsBlock(opCtx, writeTime);
status = curOpToApply.applyFunc(opCtx, nss.ns().c_str(), fieldUI, o, opTime, mode);
} catch (...) {
status = exceptionToStatus();
}
switch (status.code()) {
case ErrorCodes::WriteConflict: {
// Need to throw this up to a higher level where it will be caught and the
// operation retried.
throw WriteConflictException();
}
case ErrorCodes::BackgroundOperationInProgressForDatabase: {
Lock::TempRelease release(opCtx->lockState());
BackgroundOperation::awaitNoBgOpInProgForDb(nss.db());
opCtx->recoveryUnit()->abandonSnapshot();
opCtx->checkForInterrupt();
break;
}
case ErrorCodes::BackgroundOperationInProgressForNamespace: {
Lock::TempRelease release(opCtx->lockState());
Command* cmd = CommandHelpers::findCommand(o.firstElement().fieldName());
invariant(cmd);
// TODO: This parse could be expensive and not worth it.
BackgroundOperation::awaitNoBgOpInProgForNs(
cmd->parse(opCtx, OpMsgRequest::fromDBAndBody(nss.db(), o))->ns().toString());
opCtx->recoveryUnit()->abandonSnapshot();
opCtx->checkForInterrupt();
break;
}
default:
if (!curOpToApply.acceptableErrors.count(status.code())) {
error() << "Failed command " << redact(o) << " on " << nss.db()
<< " with status " << status << " during oplog application";
return status;
}
// fallthrough
case ErrorCodes::OK:
done = true;
break;
}
}
// AuthorizationManager's logOp method registers a RecoveryUnit::Change
// and to do so we need to have begun a UnitOfWork
WriteUnitOfWork wuow(opCtx);
getGlobalAuthorizationManager()->logOp(opCtx, opType, nss, o, nullptr);
wuow.commit();
return Status::OK();
}
void setNewTimestamp(ServiceContext* service, const Timestamp& newTime) {
stdx::lock_guard<stdx::mutex> lk(newOpMutex);
LogicalClock::get(service)->setClusterTimeFromTrustedSource(LogicalTime(newTime));
lastSetTimestamp = newTime;
newTimestampNotifier.notify_all();
}
void initTimestampFromOplog(OperationContext* opCtx, const std::string& oplogNS) {
DBDirectClient c(opCtx);
static const BSONObj reverseNaturalObj = BSON("$natural" << -1);
BSONObj lastOp = c.findOne(oplogNS, Query().sort(reverseNaturalObj), NULL, QueryOption_SlaveOk);
if (!lastOp.isEmpty()) {
LOG(1) << "replSet setting last Timestamp";
const OpTime opTime = fassert(28696, OpTime::parseFromOplogEntry(lastOp));
setNewTimestamp(opCtx->getServiceContext(), opTime.getTimestamp());
}
}
void oplogCheckCloseDatabase(OperationContext* opCtx, Database* db) {
invariant(opCtx->lockState()->isW());
if (db->name() == "local") {
_localOplogCollection = nullptr;
}
}
void acquireOplogCollectionForLogging(OperationContext* opCtx) {
if (!_oplogCollectionName.empty()) {
AutoGetCollection autoColl(opCtx, NamespaceString(_oplogCollectionName), MODE_IX);
_localOplogCollection = autoColl.getCollection();
}
}
void establishOplogCollectionForLogging(OperationContext* opCtx, Collection* oplog) {
invariant(opCtx->lockState()->isW());
invariant(oplog);
_localOplogCollection = oplog;
}
void signalOplogWaiters() {
if (_localOplogCollection) {
_localOplogCollection->notifyCappedWaitersIfNeeded();
}
}
} // namespace repl
} // namespace mongo
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