/
sharding_catalog_client_impl.cpp
1239 lines (1068 loc) · 51.1 KB
/
sharding_catalog_client_impl.cpp
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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::kSharding
#include "mongo/platform/basic.h"
#include "mongo/s/catalog/sharding_catalog_client_impl.h"
#include <iomanip>
#include <pcrecpp.h>
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/client/read_preference.h"
#include "mongo/client/remote_command_targeter.h"
#include "mongo/db/commands.h"
#include "mongo/db/logical_session_cache.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/pipeline/aggregate_command_gen.h"
#include "mongo/db/pipeline/document_source_match.h"
#include "mongo/db/pipeline/document_source_union_with.h"
#include "mongo/db/repl/optime.h"
#include "mongo/db/repl/read_concern_args.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/vector_clock.h"
#include "mongo/executor/network_interface.h"
#include "mongo/logv2/log.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/rpc/metadata/repl_set_metadata.h"
#include "mongo/s/catalog/config_server_version.h"
#include "mongo/s/catalog/type_chunk.h"
#include "mongo/s/catalog/type_collection.h"
#include "mongo/s/catalog/type_config_version.h"
#include "mongo/s/catalog/type_database.h"
#include "mongo/s/catalog/type_shard.h"
#include "mongo/s/catalog/type_tags.h"
#include "mongo/s/client/shard.h"
#include "mongo/s/client/shard_remote_gen.h"
#include "mongo/s/database_version.h"
#include "mongo/s/grid.h"
#include "mongo/s/request_types/set_shard_version_request.h"
#include "mongo/s/shard_key_pattern.h"
#include "mongo/s/shard_util.h"
#include "mongo/s/write_ops/batch_write_op.h"
#include "mongo/s/write_ops/batched_command_request.h"
#include "mongo/s/write_ops/batched_command_response.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/net/hostandport.h"
#include "mongo/util/str.h"
#include "mongo/util/time_support.h"
namespace mongo {
using repl::OpTime;
using std::set;
using std::shared_ptr;
using std::string;
using std::unique_ptr;
using std::vector;
using str::stream;
namespace {
const ReadPreferenceSetting kConfigReadSelector(ReadPreference::Nearest, TagSet{});
const ReadPreferenceSetting kConfigPrimaryPreferredSelector(ReadPreference::PrimaryPreferred,
TagSet{});
const int kMaxReadRetry = 3;
const int kMaxWriteRetry = 3;
const NamespaceString kSettingsNamespace("config", "settings");
void toBatchError(const Status& status, BatchedCommandResponse* response) {
response->clear();
response->setStatus(status);
}
void sendRetryableWriteBatchRequestToConfig(OperationContext* opCtx,
const NamespaceString& nss,
std::vector<BSONObj>& docs,
TxnNumber txnNumber,
const WriteConcernOptions& writeConcern) {
auto configShard = Grid::get(opCtx)->shardRegistry()->getConfigShard();
BatchedCommandRequest request([&] {
write_ops::InsertCommandRequest insertOp(nss);
insertOp.setDocuments(docs);
return insertOp;
}());
request.setWriteConcern(writeConcern.toBSON());
BSONObj cmdObj = request.toBSON();
BSONObjBuilder bob(cmdObj);
bob.append(OperationSessionInfo::kTxnNumberFieldName, txnNumber);
BatchedCommandResponse batchResponse;
auto response = configShard->runCommand(opCtx,
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
nss.db().toString(),
bob.obj(),
Shard::kDefaultConfigCommandTimeout,
Shard::RetryPolicy::kIdempotent);
auto writeStatus = Shard::CommandResponse::processBatchWriteResponse(response, &batchResponse);
uassertStatusOK(batchResponse.toStatus());
uassertStatusOK(writeStatus);
}
AggregateCommandRequest makeCollectionAndChunksAggregation(OperationContext* opCtx,
const NamespaceString& nss,
const ChunkVersion& sinceVersion) {
auto expCtx = make_intrusive<ExpressionContext>(opCtx, nullptr, CollectionType::ConfigNS);
StringMap<ExpressionContext::ResolvedNamespace> resolvedNamespaces;
resolvedNamespaces[CollectionType::ConfigNS.coll()] = {CollectionType::ConfigNS,
std::vector<BSONObj>()};
resolvedNamespaces[ChunkType::ConfigNS.coll()] = {ChunkType::ConfigNS, std::vector<BSONObj>()};
expCtx->setResolvedNamespaces(resolvedNamespaces);
using Doc = Document;
using Arr = std::vector<Value>;
Pipeline::SourceContainer stages;
// 1. Match config.collections entries with {_id: nss}. This stage will produce, at most, one
// config.collections document.
// {
// $match: {
// _id: <nss>
// }
// }
stages.emplace_back(DocumentSourceMatch::create(
Doc{{CollectionType::kNssFieldName, nss.toString()}}.toBson(), expCtx));
// 2. Two $unionWith stages guarded by a mutually exclusive condition on whether the refresh is
// incremental ('lastmodEpoch' matches sinceVersion.epoch), so that only a single one of them
// will possibly execute their $lookup stage. This is necessary because the query optimizer is
// not able to use indexes when a $match inside a $lookup includes a $cond operator.
//
// The $lookup stages get the config.chunks documents according to the
// type of refresh (incremental or full), sorted by ascending 'lastmod'. The $lookup is
// immediately followed by $unwind to take advantage of the $lookup + $unwind coalescence
// optimization which avoids creating large intermediate documents.
//
// This $unionWith stage will produce one result document for each config.chunks document
// matching the refresh query.
// Note that we must not make any assumption on where the document produced by stage 1 will be
// placed in the response in relation with the documents produced by stage 2. The
// config.collections document produced in stage 1 could be interleaved between the
// config.chunks documents produced by stage 2.
//
// {
// $unionWith: {
// coll: "collections",
// pipeline: [
// { $match: { _id: <nss> } },
// { $match: { lastmodEpoch: <sinceVersion.epoch> } },
// {
// $lookup: {
// from: "chunks",
// as: "chunks",
// let: { local_uuid: "$uuid" },
// pipeline: [
// {
// $match: {
// $expr: {
// $eq: ["$uuid", "$$local_uuid"],
// },
// }
// },
// { $match: { lastmod: { $gte: <sinceVersion> } } },
// {
// $sort: {
// lastmod: 1
// }
// }
// ]
// }
// },
// {
// $unwind: {
// path: "$chunks"
// }
// },
// {
// $project: { _id: false, chunks: true }
// },
// ]
// }
// },
// {
// $unionWith: {
// coll: "collections",
// pipeline: [
// { $match: { _id: <nss> } },
// { $match: { lastmodEpoch: { $ne: <sinceVersion.epoch> } } },
// {
// $lookup: {
// from: "chunks",
// as: "chunks",
// let: { local_uuid: "$uuid" },
// pipeline: [
// {
// $match: {
// $expr: {
// $eq: ["$uuid", "$$local_uuid"],
// },
// }
// },
// {
// $sort: {
// lastmod: 1
// }
// }
// ]
// }
// },
// {
// $unwind: {
// path: "$chunks"
// }
// },
// {
// $project: { _id: false, chunks: true }
// },
// ]
// }
// }
const auto buildUnionWithFn = [&](bool incremental) {
const auto lastmodEpochMatch = Doc{{incremental ? "$eq" : "$ne", sinceVersion.epoch()}};
const auto letExpr = Doc{{"local_uuid", "$" + CollectionType::kUuidFieldName}};
const auto uuidExpr =
Arr{Value{"$" + ChunkType::collectionUUID.name()}, Value{"$$local_uuid"_sd}};
constexpr auto chunksLookupOutputFieldName = "chunks"_sd;
const auto lookupPipeline = [&]() {
return Doc{
{"from", ChunkType::ConfigNS.coll()},
{"as", chunksLookupOutputFieldName},
{"let", letExpr},
{"pipeline",
Arr{Value{Doc{{"$match", Doc{{"$expr", Doc{{"$eq", uuidExpr}}}}}}},
incremental
? Value{Doc{{"$match",
Doc{{ChunkType::lastmod.name(),
Doc{{"$gte", Timestamp(sinceVersion.toLong())}}}}}}}
: Value{/*noop*/},
Value{Doc{{"$sort", Doc{{ChunkType::lastmod.name(), 1}}}}}}}};
}();
return Doc{
{"coll", CollectionType::ConfigNS.coll()},
{"pipeline",
Arr{Value{Doc{{"$match", Doc{{CollectionType::kNssFieldName, nss.toString()}}}}},
Value{Doc{{"$match", Doc{{CollectionType::kEpochFieldName, lastmodEpochMatch}}}}},
Value{Doc{{"$lookup", lookupPipeline}}},
Value{Doc{{"$unwind", Doc{{"path", "$" + chunksLookupOutputFieldName}}}}},
Value{Doc{
{"$project", Doc{{"_id", false}, {chunksLookupOutputFieldName, true}}}}}}}};
};
stages.emplace_back(DocumentSourceUnionWith::createFromBson(
Doc{{"$unionWith", buildUnionWithFn(true /* incremental */)}}.toBson().firstElement(),
expCtx));
stages.emplace_back(DocumentSourceUnionWith::createFromBson(
Doc{{"$unionWith", buildUnionWithFn(false /* incremental */)}}.toBson().firstElement(),
expCtx));
auto pipeline = Pipeline::create(std::move(stages), expCtx);
auto serializedPipeline = pipeline->serializeToBson();
return AggregateCommandRequest(CollectionType::ConfigNS, std::move(serializedPipeline));
}
} // namespace
ShardingCatalogClientImpl::ShardingCatalogClientImpl() = default;
ShardingCatalogClientImpl::~ShardingCatalogClientImpl() = default;
Status ShardingCatalogClientImpl::updateShardingCatalogEntryForCollection(
OperationContext* opCtx,
const NamespaceString& nss,
const CollectionType& coll,
const bool upsert) {
auto status = _updateConfigDocument(opCtx,
CollectionType::ConfigNS,
BSON(CollectionType::kNssFieldName << nss.ns()),
coll.toBSON(),
upsert,
ShardingCatalogClient::kMajorityWriteConcern,
Shard::kDefaultConfigCommandTimeout);
return status.getStatus().withContext(str::stream() << "Collection metadata write failed");
}
DatabaseType ShardingCatalogClientImpl::getDatabase(OperationContext* opCtx,
StringData dbName,
repl::ReadConcernLevel readConcernLevel) {
uassert(ErrorCodes::InvalidNamespace,
stream() << dbName << " is not a valid db name",
NamespaceString::validDBName(dbName, NamespaceString::DollarInDbNameBehavior::Allow));
// The admin database is always hosted on the config server.
if (dbName == NamespaceString::kAdminDb)
return DatabaseType(
dbName.toString(), ShardId::kConfigServerId, false, DatabaseVersion::makeFixed());
// The config database's primary shard is always config, and it is always sharded.
if (dbName == NamespaceString::kConfigDb)
return DatabaseType(
dbName.toString(), ShardId::kConfigServerId, true, DatabaseVersion::makeFixed());
auto result =
_fetchDatabaseMetadata(opCtx, dbName.toString(), kConfigReadSelector, readConcernLevel);
if (result == ErrorCodes::NamespaceNotFound) {
// If we failed to find the database metadata on the 'nearest' config server, try again
// against the primary, in case the database was recently created.
return uassertStatusOK(
_fetchDatabaseMetadata(opCtx,
dbName.toString(),
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
readConcernLevel))
.value;
}
return uassertStatusOK(std::move(result)).value;
}
std::vector<DatabaseType> ShardingCatalogClientImpl::getAllDBs(OperationContext* opCtx,
repl::ReadConcernLevel readConcern) {
auto dbs = uassertStatusOK(_exhaustiveFindOnConfig(opCtx,
kConfigReadSelector,
readConcern,
DatabaseType::ConfigNS,
BSONObj(),
BSONObj(),
boost::none))
.value;
std::vector<DatabaseType> databases;
databases.reserve(dbs.size());
for (const BSONObj& doc : dbs) {
auto db = uassertStatusOKWithContext(
DatabaseType::fromBSON(doc), stream() << "Failed to parse database document " << doc);
uassertStatusOKWithContext(db.validate(),
stream() << "Failed to validate database document " << doc);
databases.emplace_back(std::move(db));
}
return databases;
}
StatusWith<repl::OpTimeWith<DatabaseType>> ShardingCatalogClientImpl::_fetchDatabaseMetadata(
OperationContext* opCtx,
const std::string& dbName,
const ReadPreferenceSetting& readPref,
repl::ReadConcernLevel readConcernLevel) {
invariant(dbName != NamespaceString::kAdminDb && dbName != NamespaceString::kConfigDb);
auto findStatus = _exhaustiveFindOnConfig(opCtx,
readPref,
readConcernLevel,
DatabaseType::ConfigNS,
BSON(DatabaseType::name(dbName)),
BSONObj(),
boost::none);
if (!findStatus.isOK()) {
return findStatus.getStatus();
}
const auto& docsWithOpTime = findStatus.getValue();
if (docsWithOpTime.value.empty()) {
return {ErrorCodes::NamespaceNotFound, stream() << "database " << dbName << " not found"};
}
invariant(docsWithOpTime.value.size() == 1);
auto parseStatus = DatabaseType::fromBSON(docsWithOpTime.value.front());
if (!parseStatus.isOK()) {
return parseStatus.getStatus();
}
return repl::OpTimeWith<DatabaseType>(parseStatus.getValue(), docsWithOpTime.opTime);
}
CollectionType ShardingCatalogClientImpl::getCollection(OperationContext* opCtx,
const NamespaceString& nss,
repl::ReadConcernLevel readConcernLevel) {
auto collDoc =
uassertStatusOK(_exhaustiveFindOnConfig(opCtx,
kConfigReadSelector,
readConcernLevel,
CollectionType::ConfigNS,
BSON(CollectionType::kNssFieldName << nss.ns()),
BSONObj(),
1))
.value;
uassert(ErrorCodes::NamespaceNotFound,
stream() << "collection " << nss.ns() << " not found",
!collDoc.empty());
return CollectionType(collDoc[0]);
}
CollectionType ShardingCatalogClientImpl::getCollection(OperationContext* opCtx,
const UUID& uuid,
repl::ReadConcernLevel readConcernLevel) {
auto collDoc =
uassertStatusOK(_exhaustiveFindOnConfig(opCtx,
kConfigReadSelector,
readConcernLevel,
CollectionType::ConfigNS,
BSON(CollectionType::kUuidFieldName << uuid),
BSONObj(),
1))
.value;
uassert(ErrorCodes::NamespaceNotFound,
stream() << "Collection with UUID '" << uuid << "' not found",
!collDoc.empty());
return CollectionType(collDoc[0]);
}
std::vector<CollectionType> ShardingCatalogClientImpl::getCollections(
OperationContext* opCtx, StringData dbName, repl::ReadConcernLevel readConcernLevel) {
BSONObjBuilder b;
if (!dbName.empty())
b.appendRegex(CollectionType::kNssFieldName,
std::string(str::stream()
<< "^" << pcrecpp::RE::QuoteMeta(dbName.toString()) << "\\."));
auto collDocs = uassertStatusOK(_exhaustiveFindOnConfig(opCtx,
kConfigReadSelector,
readConcernLevel,
CollectionType::ConfigNS,
b.obj(),
BSONObj(),
boost::none))
.value;
std::vector<CollectionType> collections;
collections.reserve(collDocs.size());
for (const BSONObj& obj : collDocs)
collections.emplace_back(obj);
return collections;
}
std::vector<NamespaceString> ShardingCatalogClientImpl::getAllShardedCollectionsForDb(
OperationContext* opCtx, StringData dbName, repl::ReadConcernLevel readConcern) {
auto collectionsOnConfig = getCollections(opCtx, dbName, readConcern);
std::vector<NamespaceString> collectionsToReturn;
collectionsToReturn.reserve(collectionsOnConfig.size());
for (const auto& coll : collectionsOnConfig) {
collectionsToReturn.push_back(coll.getNss());
}
return collectionsToReturn;
}
StatusWith<BSONObj> ShardingCatalogClientImpl::getGlobalSettings(OperationContext* opCtx,
StringData key) {
auto findStatus = _exhaustiveFindOnConfig(opCtx,
kConfigReadSelector,
repl::ReadConcernLevel::kMajorityReadConcern,
kSettingsNamespace,
BSON("_id" << key),
BSONObj(),
1);
if (!findStatus.isOK()) {
return findStatus.getStatus();
}
const auto& docs = findStatus.getValue().value;
if (docs.empty()) {
return {ErrorCodes::NoMatchingDocument,
str::stream() << "can't find settings document with key: " << key};
}
invariant(docs.size() == 1);
return docs.front();
}
StatusWith<VersionType> ShardingCatalogClientImpl::getConfigVersion(
OperationContext* opCtx, repl::ReadConcernLevel readConcern) {
auto findStatus = Grid::get(opCtx)->shardRegistry()->getConfigShard()->exhaustiveFindOnConfig(
opCtx,
kConfigReadSelector,
readConcern,
VersionType::ConfigNS,
BSONObj(),
BSONObj(),
boost::none /* no limit */);
if (!findStatus.isOK()) {
return findStatus.getStatus();
}
auto queryResults = findStatus.getValue().docs;
if (queryResults.size() > 1) {
return {ErrorCodes::TooManyMatchingDocuments,
str::stream() << "should only have 1 document in " << VersionType::ConfigNS.ns()};
}
if (queryResults.empty()) {
VersionType versionInfo;
versionInfo.setMinCompatibleVersion(UpgradeHistory_EmptyVersion);
versionInfo.setCurrentVersion(UpgradeHistory_EmptyVersion);
versionInfo.setClusterId(OID{});
return versionInfo;
}
BSONObj versionDoc = queryResults.front();
auto versionTypeResult = VersionType::fromBSON(versionDoc);
if (!versionTypeResult.isOK()) {
return versionTypeResult.getStatus().withContext(
str::stream() << "Unable to parse config.version document " << versionDoc);
}
auto validationStatus = versionTypeResult.getValue().validate();
if (!validationStatus.isOK()) {
return Status(validationStatus.withContext(
str::stream() << "Unable to validate config.version document " << versionDoc));
}
return versionTypeResult.getValue();
}
StatusWith<std::vector<std::string>> ShardingCatalogClientImpl::getDatabasesForShard(
OperationContext* opCtx, const ShardId& shardId) {
auto findStatus = _exhaustiveFindOnConfig(opCtx,
kConfigReadSelector,
repl::ReadConcernLevel::kMajorityReadConcern,
DatabaseType::ConfigNS,
BSON(DatabaseType::primary(shardId.toString())),
BSONObj(),
boost::none); // no limit
if (!findStatus.isOK()) {
return findStatus.getStatus();
}
const std::vector<BSONObj>& values = findStatus.getValue().value;
std::vector<std::string> dbs;
dbs.reserve(values.size());
for (const BSONObj& obj : values) {
string dbName;
Status status = bsonExtractStringField(obj, DatabaseType::name(), &dbName);
if (!status.isOK()) {
return status;
}
dbs.push_back(std::move(dbName));
}
return dbs;
}
StatusWith<std::vector<ChunkType>> ShardingCatalogClientImpl::getChunks(
OperationContext* opCtx,
const BSONObj& query,
const BSONObj& sort,
boost::optional<int> limit,
OpTime* opTime,
const OID& epoch,
const boost::optional<Timestamp>& timestamp,
repl::ReadConcernLevel readConcern,
const boost::optional<BSONObj>& hint) {
invariant(serverGlobalParams.clusterRole == ClusterRole::ConfigServer ||
readConcern == repl::ReadConcernLevel::kMajorityReadConcern);
// Convert boost::optional<int> to boost::optional<long long>.
auto longLimit = limit ? boost::optional<long long>(*limit) : boost::none;
auto findStatus = _exhaustiveFindOnConfig(
opCtx, kConfigReadSelector, readConcern, ChunkType::ConfigNS, query, sort, longLimit, hint);
if (!findStatus.isOK()) {
return findStatus.getStatus().withContext("Failed to load chunks");
}
const auto& chunkDocsOpTimePair = findStatus.getValue();
std::vector<ChunkType> chunks;
chunks.reserve(chunkDocsOpTimePair.value.size());
for (const BSONObj& obj : chunkDocsOpTimePair.value) {
auto chunkRes = ChunkType::fromConfigBSON(obj, epoch, timestamp);
if (!chunkRes.isOK()) {
return chunkRes.getStatus().withContext(stream() << "Failed to parse chunk with id "
<< obj[ChunkType::name()]);
}
chunks.push_back(std::move(chunkRes.getValue()));
}
if (opTime) {
*opTime = chunkDocsOpTimePair.opTime;
}
return chunks;
}
std::pair<CollectionType, std::vector<ChunkType>> ShardingCatalogClientImpl::getCollectionAndChunks(
OperationContext* opCtx,
const NamespaceString& nss,
const ChunkVersion& sinceVersion,
const repl::ReadConcernArgs& readConcern) {
auto aggRequest = makeCollectionAndChunksAggregation(opCtx, nss, sinceVersion);
aggRequest.setReadConcern(readConcern.toBSONInner());
aggRequest.setWriteConcern(WriteConcernOptions());
const auto readPref = [&]() -> ReadPreferenceSetting {
if (serverGlobalParams.clusterRole == ClusterRole::ConfigServer) {
return {};
}
const auto vcTime = VectorClock::get(opCtx)->getTime();
ReadPreferenceSetting readPref{kConfigReadSelector};
readPref.minClusterTime = vcTime.configTime().asTimestamp();
return readPref;
}();
aggRequest.setUnwrappedReadPref(readPref.toContainingBSON());
if (serverGlobalParams.clusterRole != ClusterRole::ConfigServer) {
const Milliseconds maxTimeMS = std::min(opCtx->getRemainingMaxTimeMillis(),
Milliseconds(gFindChunksOnConfigTimeoutMS.load()));
aggRequest.setMaxTimeMS(durationCount<Milliseconds>(maxTimeMS));
}
// Run the aggregation
std::vector<BSONObj> aggResult;
auto callback = [&aggResult](const std::vector<BSONObj>& batch,
const boost::optional<BSONObj>& postBatchResumeToken) {
aggResult.insert(aggResult.end(),
std::make_move_iterator(batch.begin()),
std::make_move_iterator(batch.end()));
return true;
};
const auto configShard = Grid::get(opCtx)->shardRegistry()->getConfigShard();
for (int retry = 1; retry <= kMaxWriteRetry; retry++) {
const Status status = configShard->runAggregation(opCtx, aggRequest, callback);
if (retry < kMaxWriteRetry &&
configShard->isRetriableError(status.code(), Shard::RetryPolicy::kIdempotent)) {
aggResult.clear();
continue;
}
uassertStatusOK(status);
break;
}
uassert(ErrorCodes::NamespaceNotFound,
stream() << "Collection " << nss.ns() << " not found",
!aggResult.empty());
// The aggregation may return the config.collections document anywhere between the
// config.chunks documents.
// 1st: look for the collection since it is needed to properly build the chunks.
boost::optional<CollectionType> coll;
{
for (const auto& elem : aggResult) {
const auto chunkElem = elem.getField("chunks");
if (!chunkElem) {
coll.emplace(elem);
break;
}
}
uassert(5520101, "'collections' document not found in aggregation response", coll);
}
// 2nd: Traverse all the elements and build the chunks.
std::vector<ChunkType> chunks;
{
chunks.reserve(aggResult.size() - 1);
bool foundCollection = false;
for (const auto& elem : aggResult) {
const auto chunkElem = elem.getField("chunks");
if (chunkElem) {
auto chunkRes = uassertStatusOK(ChunkType::fromConfigBSON(
chunkElem.Obj(), coll->getEpoch(), coll->getTimestamp()));
chunks.emplace_back(std::move(chunkRes));
} else {
uassert(5520100,
"Found more than one 'collections' documents in aggregation response",
!foundCollection);
foundCollection = true;
}
}
uassert(ErrorCodes::ConflictingOperationInProgress,
stream() << "No chunks were found for the collection " << nss,
!chunks.empty());
}
return {std::move(*coll), std::move(chunks)};
};
StatusWith<std::vector<TagsType>> ShardingCatalogClientImpl::getTagsForCollection(
OperationContext* opCtx, const NamespaceString& nss) {
auto findStatus = _exhaustiveFindOnConfig(opCtx,
kConfigReadSelector,
repl::ReadConcernLevel::kMajorityReadConcern,
TagsType::ConfigNS,
BSON(TagsType::ns(nss.ns())),
BSON(TagsType::min() << 1),
boost::none); // no limit
if (!findStatus.isOK()) {
return findStatus.getStatus().withContext("Failed to load tags");
}
const auto& tagDocsOpTimePair = findStatus.getValue();
std::vector<TagsType> tags;
tags.reserve(tagDocsOpTimePair.value.size());
for (const BSONObj& obj : tagDocsOpTimePair.value) {
auto tagRes = TagsType::fromBSON(obj);
if (!tagRes.isOK()) {
return tagRes.getStatus().withContext(str::stream() << "Failed to parse tag with id "
<< obj[TagsType::tag()]);
}
tags.push_back(tagRes.getValue());
}
return tags;
}
StatusWith<repl::OpTimeWith<std::vector<ShardType>>> ShardingCatalogClientImpl::getAllShards(
OperationContext* opCtx, repl::ReadConcernLevel readConcern) {
auto findStatus = _exhaustiveFindOnConfig(opCtx,
kConfigReadSelector,
readConcern,
ShardType::ConfigNS,
BSONObj(), // no query filter
BSONObj(), // no sort
boost::none); // no limit
if (!findStatus.isOK()) {
return findStatus.getStatus();
}
std::vector<ShardType> shards;
shards.reserve(findStatus.getValue().value.size());
for (const BSONObj& doc : findStatus.getValue().value) {
auto shardRes = ShardType::fromBSON(doc);
if (!shardRes.isOK()) {
return shardRes.getStatus().withContext(stream()
<< "Failed to parse shard document " << doc);
}
Status validateStatus = shardRes.getValue().validate();
if (!validateStatus.isOK()) {
return validateStatus.withContext(stream()
<< "Failed to validate shard document " << doc);
}
shards.push_back(shardRes.getValue());
}
return repl::OpTimeWith<std::vector<ShardType>>{std::move(shards),
findStatus.getValue().opTime};
}
Status ShardingCatalogClientImpl::runUserManagementWriteCommand(OperationContext* opCtx,
StringData commandName,
StringData dbname,
const BSONObj& cmdObj,
BSONObjBuilder* result) {
BSONObj cmdToRun = cmdObj;
{
// Make sure that if the command has a write concern that it is w:1 or w:majority, and
// convert w:1 or no write concern to w:majority before sending.
WriteConcernOptions writeConcern;
BSONElement writeConcernElement = cmdObj[WriteConcernOptions::kWriteConcernField];
bool initialCmdHadWriteConcern = !writeConcernElement.eoo();
if (initialCmdHadWriteConcern) {
auto sw = WriteConcernOptions::parse(writeConcernElement.Obj());
if (!sw.isOK()) {
return sw.getStatus();
}
writeConcern = sw.getValue();
if ((writeConcern.wNumNodes != 1) &&
(writeConcern.wMode != WriteConcernOptions::kMajority)) {
return {ErrorCodes::InvalidOptions,
str::stream() << "Invalid replication write concern. User management write "
"commands may only use w:1 or w:'majority', got: "
<< writeConcern.toBSON()};
}
}
writeConcern.wMode = WriteConcernOptions::kMajority;
writeConcern.wNumNodes = 0;
BSONObjBuilder modifiedCmd;
if (!initialCmdHadWriteConcern) {
modifiedCmd.appendElements(cmdObj);
} else {
BSONObjIterator cmdObjIter(cmdObj);
while (cmdObjIter.more()) {
BSONElement e = cmdObjIter.next();
if (WriteConcernOptions::kWriteConcernField == e.fieldName()) {
continue;
}
modifiedCmd.append(e);
}
}
modifiedCmd.append(WriteConcernOptions::kWriteConcernField, writeConcern.toBSON());
cmdToRun = modifiedCmd.obj();
}
auto swResponse =
Grid::get(opCtx)->shardRegistry()->getConfigShard()->runCommandWithFixedRetryAttempts(
opCtx,
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
dbname.toString(),
cmdToRun,
Shard::kDefaultConfigCommandTimeout,
Shard::RetryPolicy::kNotIdempotent);
if (!swResponse.isOK()) {
return swResponse.getStatus();
}
auto response = std::move(swResponse.getValue());
if (!response.commandStatus.isOK()) {
return response.commandStatus;
}
if (!response.writeConcernStatus.isOK()) {
return response.writeConcernStatus;
}
CommandHelpers::filterCommandReplyForPassthrough(response.response, result);
return Status::OK();
}
bool ShardingCatalogClientImpl::runUserManagementReadCommand(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder* result) {
auto resultStatus =
Grid::get(opCtx)->shardRegistry()->getConfigShard()->runCommandWithFixedRetryAttempts(
opCtx,
kConfigPrimaryPreferredSelector,
dbname,
cmdObj,
Shard::kDefaultConfigCommandTimeout,
Shard::RetryPolicy::kIdempotent);
if (resultStatus.isOK()) {
CommandHelpers::filterCommandReplyForPassthrough(resultStatus.getValue().response, result);
return resultStatus.getValue().commandStatus.isOK();
}
return CommandHelpers::appendCommandStatusNoThrow(*result, resultStatus.getStatus()); // XXX
}
Status ShardingCatalogClientImpl::applyChunkOpsDeprecated(OperationContext* opCtx,
const BSONArray& updateOps,
const BSONArray& preCondition,
const UUID& uuid,
const NamespaceString& nss,
const ChunkVersion& lastChunkVersion,
const WriteConcernOptions& writeConcern,
repl::ReadConcernLevel readConcern) {
invariant(serverGlobalParams.clusterRole == ClusterRole::ConfigServer ||
(readConcern == repl::ReadConcernLevel::kMajorityReadConcern &&
writeConcern.wMode == WriteConcernOptions::kMajority));
BSONObj cmd =
BSON("applyOps" << updateOps << "preCondition" << preCondition
<< WriteConcernOptions::kWriteConcernField << writeConcern.toBSON());
auto response =
Grid::get(opCtx)->shardRegistry()->getConfigShard()->runCommandWithFixedRetryAttempts(
opCtx,
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
"config",
cmd,
Shard::RetryPolicy::kIdempotent);
if (!response.isOK()) {
return response.getStatus();
}
Status status = response.getValue().commandStatus.isOK()
? std::move(response.getValue().writeConcernStatus)
: std::move(response.getValue().commandStatus);
if (!status.isOK()) {
string errMsg;
// This could be a blip in the network connectivity. Check if the commit request made it.
//
// If all the updates were successfully written to the chunks collection, the last
// document in the list of updates should be returned from a query to the chunks
// collection. The last chunk can be identified by namespace and version number.
LOGV2_WARNING(
22675,
"Error committing chunk operation, metadata will be revalidated. Caused by {error}",
"Error committing chunk operation, metadata will be revalidated",
"error"_attr = redact(status));
// Look for the chunk in this shard whose version got bumped. We assume that if that
// mod made it to the config server, then transaction was successful.
BSONObjBuilder query;
lastChunkVersion.appendLegacyWithField(&query, ChunkType::lastmod());
query.append(ChunkType::collectionUUID(), uuid.toBSON());
auto chunkWithStatus = getChunks(opCtx,
query.obj(),
BSONObj(),
1,
nullptr,
lastChunkVersion.epoch(),
lastChunkVersion.getTimestamp(),
readConcern);
if (!chunkWithStatus.isOK()) {
errMsg = str::stream()
<< "getChunks function failed, unable to validate chunk "
<< "operation metadata: " << chunkWithStatus.getStatus().toString()
<< ". applyChunkOpsDeprecated failed to get confirmation "
<< "of commit. Unable to save chunk ops. Command: " << cmd
<< ". Result: " << response.getValue().response;
return status.withContext(errMsg);
};
const auto& newestChunk = chunkWithStatus.getValue();
if (newestChunk.empty()) {
errMsg = str::stream()
<< "chunk operation commit failed: version " << lastChunkVersion.toString()
<< " doesn't exist in namespace: " << nss.ns()
<< ". Unable to save chunk ops. Command: " << cmd
<< ". Result: " << response.getValue().response;
return status.withContext(errMsg);
};
invariant(newestChunk.size() == 1);
return Status::OK();
}
return Status::OK();
}
Status ShardingCatalogClientImpl::insertConfigDocument(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& doc,
const WriteConcernOptions& writeConcern) {
invariant(nss.db() == NamespaceString::kAdminDb || nss.db() == NamespaceString::kConfigDb);
const BSONElement idField = doc.getField("_id");
BatchedCommandRequest request([&] {
write_ops::InsertCommandRequest insertOp(nss);
insertOp.setDocuments({doc});
return insertOp;
}());
request.setWriteConcern(writeConcern.toBSON());
auto configShard = Grid::get(opCtx)->shardRegistry()->getConfigShard();
for (int retry = 1; retry <= kMaxWriteRetry; retry++) {
auto response = configShard->runBatchWriteCommand(
opCtx, Shard::kDefaultConfigCommandTimeout, request, Shard::RetryPolicy::kNoRetry);
Status status = response.toStatus();