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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::kCommand
#include "mongo/platform/basic.h"
#include "mongo/s/commands/kill_sessions_remote.h"
#include "mongo/db/client.h"
#include "mongo/db/kill_sessions_common.h"
#include "mongo/db/operation_context.h"
#include "mongo/executor/async_multicaster.h"
#include "mongo/executor/task_executor_pool.h"
#include "mongo/s/client/shard.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/commands/cluster_commands_gen.h"
#include "mongo/s/grid.h"
#include "mongo/s/query/cluster_cursor_manager.h"
namespace mongo {
namespace {
/**
* Get all hosts in the cluster.
*/
std::vector<HostAndPort> getAllClusterHosts(OperationContext* opCtx) {
auto registry = Grid::get(opCtx)->shardRegistry();
std::vector<ShardId> shardIds;
registry->getAllShardIds(opCtx, &shardIds);
std::vector<HostAndPort> servers;
for (const auto& shardId : shardIds) {
auto shard = uassertStatusOK(registry->getShard(opCtx, shardId));
auto cs = shard->getConnString();
for (auto&& host : cs.getServers()) {
servers.emplace_back(host);
}
}
return servers;
}
/**
* A function for running an arbitrary command on all shards. Only returns which hosts failed.
*/
SessionKiller::Result parallelExec(OperationContext* opCtx,
const BSONObj& cmd,
SessionKiller::UniformRandomBitGenerator* urbg) {
// Grab an arbitrary executor.
auto executor = Grid::get(opCtx)->getExecutorPool()->getArbitraryExecutor();
// Grab all hosts in the cluster.
auto servers = getAllClusterHosts(opCtx);
std::shuffle(servers.begin(), servers.end(), *urbg);
// To indicate which hosts fail.
std::vector<HostAndPort> failed;
executor::AsyncMulticaster::Options options;
options.maxConcurrency = gKillSessionsMaxConcurrency;
auto results =
executor::AsyncMulticaster(executor, options)
.multicast(servers, "admin", cmd, opCtx, Milliseconds(gKillSessionsPerHostTimeoutMS));
for (const auto& result : results) {
if (!std::get<1>(result).isOK()) {
failed.push_back(std::get<0>(result));
}
}
return failed;
}
Status killSessionsRemoteKillCursor(OperationContext* opCtx,
const SessionKiller::Matcher& matcher) {
return Grid::get(opCtx)
->getCursorManager()
->killCursorsWithMatchingSessions(opCtx, matcher)
.first;
}
} // namespace
SessionKiller::Result killSessionsRemote(OperationContext* opCtx,
const SessionKiller::Matcher& matcher,
SessionKiller::UniformRandomBitGenerator* urbg) {
// First kill local sessions.
uassertStatusOK(killSessionsRemoteKillCursor(opCtx, matcher));
uassertStatusOK(killSessionsLocalKillOps(opCtx, matcher));
// Generate the kill command.
KillAllSessionsByPatternCmd cmd;
cmd.setKillAllSessionsByPattern(std::vector<KillAllSessionsByPattern>{
matcher.getPatterns().begin(), matcher.getPatterns().end()});
return parallelExec(opCtx, cmd.toBSON(), urbg);
}
} // namespace mongo
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