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sharding_uptime_reporter.cpp
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sharding_uptime_reporter.cpp
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/**
* Copyright (C) 2016 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::kSharding
#include "mongo/platform/basic.h"
#include "mongo/s/sharding_uptime_reporter.h"
#include "mongo/db/client.h"
#include "mongo/db/server_options.h"
#include "mongo/s/balancer_configuration.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/catalog/type_mongos.h"
#include "mongo/s/grid.h"
#include "mongo/util/concurrency/idle_thread_block.h"
#include "mongo/util/exit.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/net/sock.h"
#include "mongo/util/version.h"
namespace mongo {
namespace {
//10S
const Seconds kUptimeReportInterval(10);
//hostname:port 组合
std::string constructInstanceIdString() {
return str::stream() << getHostNameCached() << ":" << serverGlobalParams.port;
}
/**
* Reports the uptime status of the current instance to the config.pings collection. This method
* is best-effort and never throws.
mongos> db.mongos.find()
{ "_id" : "bjhtxxx1:20003", "advisoryHostFQDNs" : [ ], "mongoVersion" : "3.6.10", "ping" : ISODate("2020-08-13T09:19:30.154Z"), "up" : NumberLong(15653743), "waiting" : true }
{ "_id" : "bjhtxxx2:20003", "advisoryHostFQDNs" : [ ], "mongoVersion" : "3.6.13", "ping" : ISODate("2020-08-13T09:19:31.911Z"), "up" : NumberLong(18239828), "waiting" : true }
{ "_id" : "bjhtxxx3:20002", "advisoryHostFQDNs" : [ ], "mongoVersion" : "3.6.13", "ping" : ISODate("2020-08-13T09:19:24.496Z"), "up" : NumberLong(18320414), "waiting" : true }
mongos>
bjhtxxx2:20022被kill掉后，则ping时间和up时间不会增加，ping和up都是10s增加
{ "_id" : "bjhtxxx1:20009", "advisoryHostFQDNs" : [ ], "mongoVersion" : "3.6.10", "ping" : ISODate("2020-08-13T11:10:21.458Z"), "up" : NumberLong(14227), "waiting" : true }
{ "_id" : "bjhtxxx2:20022", "advisoryHostFQDNs" : [ ], "mongoVersion" : "3.6.10", "ping" : ISODate("2020-08-13T11:08:37.637Z"), "up" : NumberLong(14256), "waiting" : true }
{ "_id" : "bjhtxxx3:20009", "advisoryHostFQDNs" : [ ], "mongoVersion" : "3.6.10", "ping" : ISODate("2020-08-13T11:10:21.323Z"), "up" : NumberLong(14307), "waiting" : true }
*/
//ShardingUptimeReporter::startPeriodicThread线程循环调用 10s执行一次
void reportStatus(OperationContext* opCtx,
const std::string& instanceId,
const Timer& upTimeTimer) {
MongosType mType;
mType.setName(instanceId);
//时间搓设置
mType.setPing(jsTime());
mType.setUptime(upTimeTimer.seconds());
// balancer is never active in mongos. Here for backwards compatibility only.
mType.setWaiting(true);
//version信息
mType.setMongoVersion(VersionInfoInterface::instance().version().toString());
//db.pings.update({ _id : "bjhtxxx1:20003" }, { $set : {mType } })
try { //远程跟新cfg的config.pings表
Grid::get(opCtx)
->catalogClient()
->updateConfigDocument(opCtx,
MongosType::ConfigNS,
BSON(MongosType::name(instanceId)),
BSON("$set" << mType.toBSON()),
true,
ShardingCatalogClient::kMajorityWriteConcern)
.status_with_transitional_ignore();
} catch (const std::exception& e) {
log() << "Caught exception while reporting uptime: " << e.what();
}
}
} // namespace
ShardingUptimeReporter::ShardingUptimeReporter() = default;
ShardingUptimeReporter::~ShardingUptimeReporter() {
// The thread must not be running when this object is destroyed
invariant(!_thread.joinable());
}
void ShardingUptimeReporter::startPeriodicThread() {
invariant(!_thread.joinable());
_thread = stdx::thread([this] {
Client::initThread("Uptime reporter");
//hostname:port 组合
const std::string instanceId(constructInstanceIdString());
const Timer upTimeTimer;
//每隔10s向CFG的config.pings表做跟新，从config.pings表，如果mongos挂了则不会更新
//"ping"和"up"以10s增加
while (!globalInShutdownDeprecated()) {
{
auto opCtx = cc().makeOperationContext();
reportStatus(opCtx.get(), instanceId, upTimeTimer);
auto status = Grid::get(opCtx.get())
->getBalancerConfiguration()
->refreshAndCheck(opCtx.get());
if (!status.isOK()) {
warning() << "failed to refresh mongos settings" << causedBy(status);
}
}
MONGO_IDLE_THREAD_BLOCK;
//延时10s，也就是每10s对config.pings做更新
sleepFor(kUptimeReportInterval);
}
});
}
} // namespace mongo