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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_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand
#include "mongo/platform/basic.h"
#include "mongo/db/commands.h"
#include "mongo/logv2/log.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/s/cluster_commands_helpers.h"
#include "mongo/s/grid.h"
namespace mongo {
namespace {
class CollectionStats : public BasicCommand {
public:
CollectionStats() : BasicCommand("collStats", "collstats") {}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kAlways;
}
bool adminOnly() const override {
return false;
}
bool maintenanceOk() const override {
return false;
}
std::string parseNs(const std::string& dbname, const BSONObj& cmdObj) const override {
return CommandHelpers::parseNsCollectionRequired(dbname, cmdObj).ns();
}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) const override {
ActionSet actions;
actions.addAction(ActionType::collStats);
out->push_back(Privilege(parseResourcePattern(dbname, cmdObj), actions));
}
bool run(OperationContext* opCtx,
const std::string& dbName,
const BSONObj& cmdObj,
BSONObjBuilder& result) override {
const NamespaceString nss(parseNs(dbName, cmdObj));
auto routingInfo =
uassertStatusOK(Grid::get(opCtx)->catalogCache()->getCollectionRoutingInfo(opCtx, nss));
if (routingInfo.cm()) {
result.appendBool("sharded", true);
} else {
result.appendBool("sharded", false);
result.append("primary", routingInfo.db().primaryId().toString());
}
auto shardResults = scatterGatherVersionedTargetByRoutingTable(
opCtx,
nss.db(),
nss,
routingInfo,
applyReadWriteConcern(
opCtx, this, CommandHelpers::filterCommandRequestForPassthrough(cmdObj)),
ReadPreferenceSetting::get(opCtx),
Shard::RetryPolicy::kIdempotent,
{},
{});
BSONObjBuilder shardStats;
std::map<std::string, long long> counts;
std::map<std::string, long long> indexSizes;
long long maxSize = 0;
long long unscaledCollSize = 0;
int nindexes = 0;
bool warnedAboutIndexes = false;
for (const auto& shardResult : shardResults) {
const auto& shardId = shardResult.shardId;
const auto shardResponse = uassertStatusOK(std::move(shardResult.swResponse));
uassertStatusOK(shardResponse.status);
const auto& res = shardResponse.data;
uassertStatusOK(getStatusFromCommandResult(res));
// We don't know the order that we will encounter the count and size, so we save them
// until we've iterated through all the fields before updating unscaledCollSize
const auto shardObjCount = static_cast<long long>(res["count"].Number());
auto fieldIsAnyOf = [](StringData v, std::initializer_list<StringData> il) {
auto ei = il.end();
return std::find(il.begin(), ei, v) != ei;
};
for (const auto& e : res) {
StringData fieldName = e.fieldNameStringData();
if (fieldIsAnyOf(fieldName, {"ns", "ok", "lastExtentSize", "paddingFactor"})) {
continue;
}
if (fieldIsAnyOf(fieldName,
{"userFlags",
"capped",
"max",
"paddingFactorNote",
"indexDetails",
"wiredTiger"})) {
// Fields that are copied from the first shard only, because they need to
// match across shards
if (!result.hasField(e.fieldName()))
result.append(e);
} else if (fieldIsAnyOf(
fieldName,
{"count", "size", "storageSize", "totalIndexSize", "totalSize"})) {
counts[e.fieldName()] += e.numberLong();
} else if (fieldName == "avgObjSize") {
const auto shardAvgObjSize = e.numberLong();
unscaledCollSize += shardAvgObjSize * shardObjCount;
} else if (fieldName == "maxSize") {
const auto shardMaxSize = e.numberLong();
maxSize = std::max(maxSize, shardMaxSize);
} else if (fieldName == "indexSizes") {
BSONObjIterator k(e.Obj());
while (k.more()) {
BSONElement temp = k.next();
indexSizes[temp.fieldName()] += temp.numberLong();
}
} else if (fieldName == "nindexes") {
int myIndexes = e.numberInt();
if (nindexes == 0) {
nindexes = myIndexes;
} else if (nindexes == myIndexes) {
// no-op
} else {
// hopefully this means we're building an index
if (myIndexes > nindexes)
nindexes = myIndexes;
if (!warnedAboutIndexes) {
result.append("warning",
"indexes don't all match - ok if ensureIndex is running");
warnedAboutIndexes = true;
}
}
} else {
LOGV2(22749,
"Unexpected field for mongos collStats: {fieldName}",
"Unexpected field for mongos collStats",
"fieldName"_attr = e.fieldName());
}
}
shardStats.append(shardId.toString(), res);
}
result.append("ns", nss.ns());
for (const auto& countEntry : counts) {
result.appendNumber(countEntry.first, countEntry.second);
}
{
BSONObjBuilder ib(result.subobjStart("indexSizes"));
for (const auto& entry : indexSizes) {
ib.appendNumber(entry.first, entry.second);
}
ib.done();
}
// The unscaled avgObjSize for each shard is used to get the unscaledCollSize because the
// raw size returned by the shard is affected by the command's scale parameter
if (counts["count"] > 0)
result.append("avgObjSize", (double)unscaledCollSize / (double)counts["count"]);
else
result.append("avgObjSize", 0.0);
result.append("maxSize", maxSize);
result.append("nindexes", nindexes);
result.append("nchunks", (routingInfo.cm() ? routingInfo.cm()->numChunks() : 1));
result.append("shards", shardStats.obj());
return true;
}
} collectionStatsCmd;
} // namespace
} // namespace mongo
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