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/**
* Copyright (C) 2023-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/query_analysis_client.h"
#include "mongo/db/concurrency/replication_state_transition_lock_guard.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
namespace analyze_shard_key {
namespace {
MONGO_FAIL_POINT_DEFINE(queryAnalysisClientHangExecutingCommandLocally);
MONGO_FAIL_POINT_DEFINE(queryAnalysisClientHangExecutingCommandRemotely);
const auto getQueryAnalysisClient = ServiceContext::declareDecoration<QueryAnalysisClient>();
const auto getTaskExecutor =
ServiceContext::declareDecoration<std::shared_ptr<executor::TaskExecutor>>();
const int kMaxRetriesOnRetryableErrors = 5;
// The write concern for writes done as part of query sampling or analyzing a shard key.
const Seconds writeConcernTimeout{60};
const WriteConcernOptions kMajorityWriteConcern{
WriteConcernOptions::kMajority, WriteConcernOptions::SyncMode::UNSET, writeConcernTimeout};
} // namespace
QueryAnalysisClient& QueryAnalysisClient::get(OperationContext* opCtx) {
return get(opCtx->getServiceContext());
}
QueryAnalysisClient& QueryAnalysisClient::get(ServiceContext* serviceContext) {
return getQueryAnalysisClient(serviceContext);
}
void QueryAnalysisClient::setTaskExecutor(ServiceContext* service,
std::shared_ptr<executor::TaskExecutor> executor) {
getTaskExecutor(service) = std::move(executor);
}
bool QueryAnalysisClient::_canAcceptWrites(OperationContext* opCtx, const DatabaseName& dbName) {
repl::ReplicationStateTransitionLockGuard rstl(opCtx, MODE_IX);
return mongo::repl::ReplicationCoordinator::get(opCtx)->canAcceptWritesForDatabase(opCtx,
dbName);
}
BSONObj QueryAnalysisClient::_executeCommandOnPrimaryLocal(
OperationContext* opCtx,
const DatabaseName& dbName,
const BSONObj& cmdObj,
const std::function<void(const BSONObj&)>& uassertCmdStatusFn) {
DBDirectClient client(opCtx);
BSONObj resObj;
client.runCommand(dbName, cmdObj, resObj);
uassertCmdStatusFn(resObj);
return resObj;
}
BSONObj QueryAnalysisClient::_executeCommandOnPrimaryRemote(
OperationContext* opCtx,
const DatabaseName& dbName,
const BSONObj& cmdObj,
const std::function<void(const BSONObj&)>& uassertCmdStatusFn) {
auto hostAndPort = repl::ReplicationCoordinator::get(opCtx)->getCurrentPrimaryHostAndPort();
if (hostAndPort.empty()) {
uasserted(ErrorCodes::PrimarySteppedDown, "No primary exists currently");
}
auto executor = getTaskExecutor(opCtx->getServiceContext());
invariant(executor, "Failed to run command since the executor has not been initialized");
executor::RemoteCommandRequest request(
std::move(hostAndPort), DatabaseNameUtil::serialize(dbName), cmdObj, opCtx);
auto [promise, future] = makePromiseFuture<executor::TaskExecutor::RemoteCommandCallbackArgs>();
auto promisePtr = std::make_shared<Promise<executor::TaskExecutor::RemoteCommandCallbackArgs>>(
std::move(promise));
auto scheduleResult = executor->scheduleRemoteCommand(
std::move(request), [promisePtr](const auto& args) { promisePtr->emplaceValue(args); });
if (!scheduleResult.isOK()) {
// Since the command failed to be scheduled, the callback above did not and will not run.
// Thus, it is safe to fulfill the promise here without worrying about synchronizing access
// with the executor's thread.
promisePtr->setError(scheduleResult.getStatus());
}
auto rcr = uassertStatusOK(future.getNoThrow(opCtx));
uassertStatusOK(rcr.response.status);
uassertCmdStatusFn(rcr.response.data);
return rcr.response.data;
}
BSONObj QueryAnalysisClient::executeCommandOnPrimary(
OperationContext* opCtx,
const DatabaseName& dbName,
const BSONObj& cmdObj,
const std::function<void(const BSONObj&)>& uassertCmdStatusFn) {
auto numRetries = 0;
while (true) {
try {
if (_canAcceptWrites(opCtx, dbName)) {
// There is a window here where this mongod may step down after check above. In this
// case, a NotWritablePrimary error would be thrown. However, this is preferable to
// running the command while holding locks.
queryAnalysisClientHangExecutingCommandLocally.pauseWhileSet(opCtx);
return _executeCommandOnPrimaryLocal(opCtx, dbName, cmdObj, uassertCmdStatusFn);
}
queryAnalysisClientHangExecutingCommandRemotely.pauseWhileSet(opCtx);
return _executeCommandOnPrimaryRemote(opCtx, dbName, cmdObj, uassertCmdStatusFn);
} catch (DBException& ex) {
if (ErrorCodes::isRetriableError(ex) && numRetries < kMaxRetriesOnRetryableErrors) {
numRetries++;
continue;
}
throw;
}
}
MONGO_UNREACHABLE;
}
void QueryAnalysisClient::insert(OperationContext* opCtx,
const NamespaceString& nss,
const std::vector<BSONObj>& docs,
const std::function<void(const BSONObj&)>& uassertCmdStatusFn) {
write_ops::InsertCommandRequest insertCmd(nss);
insertCmd.setDocuments(docs);
insertCmd.setWriteCommandRequestBase([&] {
write_ops::WriteCommandRequestBase wcb;
wcb.setOrdered(false);
wcb.setBypassDocumentValidation(false);
return wcb;
}());
auto insertCmdObj = insertCmd.toBSON(
{BSON(WriteConcernOptions::kWriteConcernField << kMajorityWriteConcern.toBSON())});
executeCommandOnPrimary(opCtx, nss.dbName(), std::move(insertCmdObj), uassertCmdStatusFn);
}
} // namespace analyze_shard_key
} // namespace mongo
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