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// write_conflict_exception.cpp
/**
* Copyright (C) 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::kWrite
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/server_parameters.h"
#include "mongo/util/log.h"
#include "mongo/util/stacktrace.h"
namespace mongo {
bool WriteConflictException::trace = false;
WriteConflictException::WriteConflictException()
: DBException( "WriteConflict", ErrorCodes::WriteConflict ) {
if ( trace ) {
printStackTrace();
}
}
void WriteConflictException::logAndBackoff(int attempt,
StringData operation,
StringData ns) {
LOG(1) << "Caught WriteConflictException doing " << operation
<< " on " << ns
<< ", attempt: " << attempt << " retrying";
// All numbers below chosen by guess and check against a few random benchmarks.
if (attempt < 4) {
// no-op
}
else if (attempt < 10) {
sleepmillis(1);
}
else if (attempt < 100) {
sleepmillis(5);
}
else {
sleepmillis(10);
}
}
namespace {
// for WriteConflictException
ExportedServerParameter<bool> TraceWCExceptionsSetting(ServerParameterSet::getGlobal(),
"traceWriteConflictExceptions",
&WriteConflictException::trace,
false, // allowedToChangeAtStartup
true); // allowedToChangeAtRuntime
}
}
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