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/**
* Copyright (C) 2020-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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 "mongo/s/hedge_options_util.h"
#include "mongo/s/mongos_server_parameters_gen.h"
namespace mongo {
namespace {
// Only hedge commands that cannot trigger writes.
const std::set<std::string> supportedCmds{"collStats",
"count",
"dataSize",
"dbStats",
"distinct",
"filemd5",
"find",
"listCollections",
"listIndexes",
"planCacheListFilters"};
} // namespace
void extractHedgeOptions(const BSONObj& cmdObj,
const ReadPreferenceSetting& readPref,
executor::RemoteCommandRequestOnAny::Options& options) {
options.resetHedgeOptions();
if (!(gReadHedgingMode.load() == ReadHedgingMode::kOn && readPref.hedgingMode &&
readPref.hedgingMode->getEnabled())) {
return;
}
auto cmdName(cmdObj.firstElement().fieldNameStringData().toString());
if (supportedCmds.count(cmdName)) {
options.hedgeCount = 1;
options.maxTimeMSForHedgedReads = gMaxTimeMSForHedgedReads.load();
options.isHedgeEnabled = true;
return;
}
}
} // namespace mongo
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