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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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/s/balancer/cluster_statistics_impl.h"
#include <algorithm>
#include "mongo/base/status_with.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/client/read_preference.h"
#include "mongo/logv2/log.h"
#include "mongo/s/catalog/type_shard.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/s/shard_util.h"
#include "mongo/util/str.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
namespace {
const char kVersionField[] = "version";
/**
* Executes the serverStatus command against the specified shard and obtains the version of the
* running MongoD service.
*
* Returns the MongoD version in strig format or an error. Known error codes are:
* ShardNotFound if shard by that id is not available on the registry
* NoSuchKey if the version could not be retrieved
*/
StatusWith<std::string> retrieveShardMongoDVersion(OperationContext* opCtx, ShardId shardId) {
auto shardRegistry = Grid::get(opCtx)->shardRegistry();
auto shardStatus = shardRegistry->getShard(opCtx, shardId);
if (!shardStatus.isOK()) {
return shardStatus.getStatus();
}
auto shard = shardStatus.getValue();
auto commandResponse =
shard->runCommandWithFixedRetryAttempts(opCtx,
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
"admin",
BSON("serverStatus" << 1),
Shard::RetryPolicy::kIdempotent);
if (!commandResponse.isOK()) {
return commandResponse.getStatus();
}
if (!commandResponse.getValue().commandStatus.isOK()) {
return commandResponse.getValue().commandStatus;
}
BSONObj serverStatus = std::move(commandResponse.getValue().response);
std::string version;
Status status = bsonExtractStringField(serverStatus, kVersionField, &version);
if (!status.isOK()) {
return status;
}
return version;
}
} // namespace
using ShardStatistics = ClusterStatistics::ShardStatistics;
ClusterStatisticsImpl::ClusterStatisticsImpl(BalancerRandomSource& random) : _random(random) {}
ClusterStatisticsImpl::~ClusterStatisticsImpl() = default;
StatusWith<std::vector<ShardStatistics>> ClusterStatisticsImpl::getStats(OperationContext* opCtx) {
return _getStats(opCtx, boost::none);
}
StatusWith<std::vector<ShardStatistics>> ClusterStatisticsImpl::getCollStats(
OperationContext* opCtx, NamespaceString const& ns) {
return _getStats(opCtx, ns);
}
StatusWith<std::vector<ShardStatistics>> ClusterStatisticsImpl::_getStats(
OperationContext* opCtx, boost::optional<NamespaceString> ns) {
// Get a list of all the shards that are participating in this balance round along with any
// maximum allowed quotas and current utilization. We get the latter by issuing
// db.serverStatus() (mem.mapped) to all shards.
//
// TODO: skip unresponsive shards and mark information as stale.
auto shardsStatus = Grid::get(opCtx)->catalogClient()->getAllShards(
opCtx, repl::ReadConcernLevel::kMajorityReadConcern);
if (!shardsStatus.isOK()) {
return shardsStatus.getStatus();
}
auto& shards = shardsStatus.getValue().value;
std::shuffle(shards.begin(), shards.end(), _random);
std::vector<ShardStatistics> stats;
for (const auto& shard : shards) {
const auto shardSizeStatus = [&]() -> StatusWith<long long> {
if (ns) {
return shardutil::retrieveCollectionShardSize(opCtx, shard.getName(), *ns);
}
// optimization for the case where the balancer does not care about the dataSize
if (!shard.getMaxSizeMB()) {
return 0;
}
return shardutil::retrieveTotalShardSize(opCtx, shard.getName());
}();
if (!shardSizeStatus.isOK()) {
const auto& status = shardSizeStatus.getStatus();
return status.withContext(str::stream()
<< "Unable to obtain shard utilization information for "
<< shard.getName());
}
std::string mongoDVersion;
auto mongoDVersionStatus = retrieveShardMongoDVersion(opCtx, shard.getName());
if (mongoDVersionStatus.isOK()) {
mongoDVersion = std::move(mongoDVersionStatus.getValue());
} else {
// Since the mongod version is only used for reporting, there is no need to fail the
// entire round if it cannot be retrieved, so just leave it empty
LOGV2(21895,
"Unable to obtain shard version for {shardId}: {error}",
"Unable to obtain shard version",
"shardId"_attr = shard.getName(),
"error"_attr = mongoDVersionStatus.getStatus());
}
std::set<std::string> shardZones;
for (const auto& shardZone : shard.getTags()) {
shardZones.insert(shardZone);
}
stats.emplace_back(shard.getName(),
shard.getMaxSizeMB() * 1024 * 1024,
shardSizeStatus.getValue(),
shard.getDraining(),
std::move(shardZones),
std::move(mongoDVersion),
ShardStatistics::use_bytes_t{});
}
return stats;
}
} // namespace mongo
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