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/**
* Copyright (C) 2008 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.
*/
#pragma once
#include <deque>
#include "mongo/base/status.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/db/storage/mmap_v1/dur.h"
#include "mongo/stdx/functional.h"
#include "mongo/util/concurrency/old_thread_pool.h"
namespace mongo {
class Database;
class OperationContext;
namespace repl {
class BackgroundSyncInterface;
class ReplicationCoordinator;
class OpTime;
/**
* "Normal" replica set syncing
*/
class SyncTail {
public:
using MultiSyncApplyFunc = stdx::function<void(const std::vector<BSONObj>& ops, SyncTail* st)>;
/**
* Type of function that takes a non-command op and applies it locally.
* Used for applying from an oplog.
* Last boolean argument 'convertUpdateToUpsert' converts some updates to upserts for
* idempotency reasons.
* Returns failure status if the op was an update that could not be applied.
*/
using ApplyOperationInLockFn =
stdx::function<Status(OperationContext*, Database*, const BSONObj&, bool)>;
/**
* Type of function that takes a command op and applies it locally.
* Used for applying from an oplog.
* Returns failure status if the op that could not be applied.
*/
using ApplyCommandInLockFn = stdx::function<Status(OperationContext*, const BSONObj&)>;
/**
* Type of function to increment "repl.apply.ops" server status metric.
*/
using IncrementOpsAppliedStatsFn = stdx::function<void()>;
SyncTail(BackgroundSyncInterface* q, MultiSyncApplyFunc func);
virtual ~SyncTail();
/**
* Applies the operation that is in param o.
* Functions for applying operations/commands and increment server status counters may
* be overridden for testing.
*/
static Status syncApply(OperationContext* txn,
const BSONObj& o,
bool convertUpdateToUpsert,
ApplyOperationInLockFn applyOperationInLock,
ApplyCommandInLockFn applyCommandInLock,
IncrementOpsAppliedStatsFn incrementOpsAppliedStats);
static Status syncApply(OperationContext* txn, const BSONObj& o, bool convertUpdateToUpsert);
/**
* Runs _applyOplogUntil(stopOpTime)
*/
virtual void oplogApplication(OperationContext* txn, const OpTime& stopOpTime);
void oplogApplication();
bool peek(BSONObj* obj);
class OpQueue {
public:
OpQueue() : _size(0) {}
size_t getSize() const {
return _size;
}
const std::deque<BSONObj>& getDeque() const {
return _deque;
}
void push_back(BSONObj& op) {
_deque.push_back(op);
_size += op.objsize();
}
bool empty() const {
return _deque.empty();
}
BSONObj back() const {
invariant(!_deque.empty());
return _deque.back();
}
private:
std::deque<BSONObj> _deque;
size_t _size;
};
// returns true if we should continue waiting for BSONObjs, false if we should
// stop waiting and apply the queue we have. Only returns false if !ops.empty().
bool tryPopAndWaitForMore(OperationContext* txn,
OpQueue* ops,
ReplicationCoordinator* replCoord);
/**
* Fetch a single document referenced in the operation from the sync source.
*/
virtual BSONObj getMissingDoc(OperationContext* txn, Database* db, const BSONObj& o);
/**
* If applyOperation_inlock should be called again after an update fails.
*/
virtual bool shouldRetry(OperationContext* txn, const BSONObj& o);
void setHostname(const std::string& hostname);
protected:
// Cap the batches using the limit on journal commits.
// This works out to be 100 MB (64 bit) or 50 MB (32 bit)
static const unsigned int replBatchLimitBytes = dur::UncommittedBytesLimit;
static const int replBatchLimitSeconds = 1;
static const unsigned int replBatchLimitOperations = 5000;
// SyncTail base class always supports awaiting commit if any op has j:true flag
// that indicates awaiting commit before updating last OpTime.
virtual bool supportsWaitingUntilDurable() {
return true;
}
// Prefetch and write a deque of operations, using the supplied function.
// Initial Sync and Sync Tail each use a different function.
// Returns the last OpTime applied.
static OpTime multiApply(OperationContext* txn,
const OpQueue& ops,
OldThreadPool* prefetcherPool,
OldThreadPool* writerPool,
MultiSyncApplyFunc func,
SyncTail* sync,
bool supportsAwaitingCommit);
/**
* Applies oplog entries until reaching "endOpTime".
*
* NOTE:Will not transition or check states
*/
void _applyOplogUntil(OperationContext* txn, const OpTime& endOpTime);
private:
std::string _hostname;
BackgroundSyncInterface* _networkQueue;
// Function to use during applyOps
MultiSyncApplyFunc _applyFunc;
void handleSlaveDelay(const BSONObj& op);
// persistent pool of worker threads for writing ops to the databases
OldThreadPool _writerPool;
// persistent pool of worker threads for prefetching
OldThreadPool _prefetcherPool;
};
// These free functions are used by the thread pool workers to write ops to the db.
void multiSyncApply(const std::vector<BSONObj>& ops, SyncTail* st);
void multiInitialSyncApply(const std::vector<BSONObj>& ops, SyncTail* st);
} // namespace repl
} // namespace mongo
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