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writeback_listener.h
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writeback_listener.h
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// @file writeback_listener.h
/**
* Copyright (C) 2010 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/>.
*/
#pragma once
#include "../pch.h"
#include "../client/connpool.h"
#include "../util/background.h"
namespace mongo {
/*
* The writeback listener takes back write attempts that were made against a wrong shard.
* (Wrong here in the sense that the target chunk moved before this mongos had a chance to
* learn so.) It is responsible for reapplying these writes to the correct shard.
*
* Currently, there is one listener per shard.
*/
class WriteBackListener : public BackgroundJob {
public:
static void init( DBClientBase& conn );
static void waitFor( const OID& oid );
protected:
WriteBackListener( const string& addr );
string name() const { return "WriteBackListener"; }
void run();
private:
string _addr;
static mongo::mutex _cacheLock; // protects _cache
static map<string,WriteBackListener*> _cache;
static mongo::mutex _seenWritebacksLock; // protects _seenWritbacks
static set<OID> _seenWritebacks; // TODO: this can grow unbounded
};
void waitForWriteback( const OID& oid );
} // namespace mongo