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/**
* Copyright (C) 2018-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.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
#include "mongo/platform/basic.h"
#include "mongo/db/s/periodic_balancer_config_refresher.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/logv2/log.h"
#include "mongo/s/balancer_configuration.h"
#include "mongo/s/grid.h"
namespace mongo {
namespace {
const auto getPeriodicBalancerConfigRefresher =
ServiceContext::declareDecoration<PeriodicBalancerConfigRefresher>();
PeriodicJobAnchor launchBalancerConfigRefresher(ServiceContext* serviceContext) {
auto periodicRunner = serviceContext->getPeriodicRunner();
invariant(periodicRunner);
PeriodicRunner::PeriodicJob job(
"PeriodicBalancerConfigRefresher",
[](Client* client) {
auto opCtx = client->makeOperationContext();
const auto balancerConfig = Grid::get(opCtx.get())->getBalancerConfiguration();
invariant(balancerConfig);
Status status = balancerConfig->refreshAndCheck(opCtx.get());
if (!status.isOK()) {
LOGV2(22048,
"Failed to refresh balancer configuration: {error}",
"Failed to refresh balancer configuration",
"error"_attr = redact(status));
}
},
Seconds(30));
auto balancerConfigRefresher = periodicRunner->makeJob(std::move(job));
balancerConfigRefresher.start();
return balancerConfigRefresher;
}
} // namespace
PeriodicBalancerConfigRefresher& PeriodicBalancerConfigRefresher::get(OperationContext* opCtx) {
return get(opCtx->getServiceContext());
}
PeriodicBalancerConfigRefresher& PeriodicBalancerConfigRefresher::get(
ServiceContext* serviceContext) {
return getPeriodicBalancerConfigRefresher(serviceContext);
}
void PeriodicBalancerConfigRefresher::onShardingInitialization(ServiceContext* serviceContext,
bool isPrimary) {
_isPrimary = isPrimary;
// This function is called on sharding state initialization, so go ahead
// and start up the balancer config refresher task if we're a primary.
if (isPrimary && !_balancerConfigRefresher.isValid()) {
_balancerConfigRefresher = launchBalancerConfigRefresher(serviceContext);
}
}
void PeriodicBalancerConfigRefresher::onStepUp(ServiceContext* serviceContext) {
if (!_isPrimary) {
_isPrimary = true;
// If this is the first time we're stepping up, start a thread to periodically refresh the
// balancer configuration.
if (!_balancerConfigRefresher.isValid()) {
_balancerConfigRefresher = launchBalancerConfigRefresher(serviceContext);
} else {
// If we're stepping up again after having stepped down, just resume
// the existing task.
_balancerConfigRefresher.resume();
}
}
}
void PeriodicBalancerConfigRefresher::onStepDown() {
if (_isPrimary) {
_isPrimary = false;
invariant(_balancerConfigRefresher.isValid());
// We don't need to be refreshing the balancer configuration unless we're primary.
_balancerConfigRefresher.pause();
}
}
} // namespace mongo
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