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/**
* Copyright (C) 2013 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.
*/
#include <string>
#include "mongo/db/namespace_string.h"
#include "mongo/db/jsobj.h"
namespace mongo {
class OperationContext;
/**
* Merges a chunks in the specified [minKey, maxKey) range of the specified namespace.
* Updates the local and remote metadata by expanding the bounds of the first chunk in the
* range, dropping the others, and incrementing the minor version of the shard to the next
* higher version. Returns true on success.
*
* Fails with errMsg if the 'epoch' was set and has changed (indicating the range is no longer
* valid), or if the range does not exactly start and stop on chunks owned by this shard, or
* if the chunks in this range are not contiguous.
*
* WARNING: On network failure, it is possible that the chunks in our local metadata may not
* match the remote metadata, however the key ranges protected will be the same. All metadata
* operations are responsible for updating the metadata before performing any actions.
*
* Locking note:
* + Takes a distributed lock over the namespace
* + Cannot be called with any other locks held
*/
bool mergeChunks(OperationContext* txn,
const NamespaceString& nss,
const BSONObj& minKey,
const BSONObj& maxKey,
const OID& epoch,
std::string* errMsg);
}
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