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/**
* Copyright (C) 2021-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/bson/oid.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/s/balancer/balance_stats.h"
#include "mongo/db/s/balancer/balancer_policy.h"
#include "mongo/s/chunk_manager.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
namespace {
class BalanceStatsTest : public mongo::unittest::Test {
public:
ChunkType makeChunk(const BSONObj& minKey, const BSONObj& maxKey, const ShardId& shard) {
_nextVersion.incMinor();
return ChunkType(_uuid, ChunkRange(minKey, maxKey), _nextVersion, shard);
}
ShardType makeShard(const std::string& name, std::vector<std::string> tags = {}) {
return ShardType(name, name, tags);
}
ChunkManager makeRoutingInfo(const KeyPattern& shardKeyPattern,
const std::vector<ChunkType>& chunks) {
auto routingTableHistory = RoutingTableHistory::makeNew(_nss,
_uuid, // UUID
shardKeyPattern,
{}, // collator
false, // unique
_epoch,
_timestamp, // timestamp
boost::none, // time series fields
boost::none, // resharding fields
boost::none, // chunk size bytes
true, // allowMigration
chunks);
return ChunkManager(_shardPrimary,
_dbVersion,
RoutingTableHistoryValueHandle(std::move(routingTableHistory)),
boost::none);
}
private:
const NamespaceString _nss{"foo.bar"};
const UUID _uuid = UUID::gen();
const OID _epoch{OID::gen()};
const Timestamp _timestamp{Timestamp(1, 1)};
const ShardId _shardPrimary{"dummyShardPrimary"};
const DatabaseVersion _dbVersion{UUID::gen(), _timestamp};
ChunkVersion _nextVersion{1, 0, _epoch, _timestamp};
};
TEST_F(BalanceStatsTest, SingleChunkNoZones) {
std::vector<ShardType> shards;
shards.push_back(makeShard("a"));
std::vector<ChunkType> chunks;
chunks.push_back(makeChunk(BSON("x" << MINKEY), BSON("x" << MAXKEY), ShardId("a")));
auto routingInfo = makeRoutingInfo(KeyPattern(BSON("x" << 1)), chunks);
auto imbalanceCount = getMaxChunkImbalanceCount(routingInfo, shards, {});
ASSERT_EQ(0, imbalanceCount);
}
TEST_F(BalanceStatsTest, SingleShardHasMoreChunksNoZones) {
std::vector<ShardType> shards;
shards.push_back(makeShard("a"));
shards.push_back(makeShard("b"));
std::vector<ChunkType> chunks;
chunks.push_back(makeChunk(BSON("x" << MINKEY), BSON("x" << 10), ShardId("a")));
chunks.push_back(makeChunk(BSON("x" << 10), BSON("x" << 20), ShardId("b")));
chunks.push_back(makeChunk(BSON("x" << 20), BSON("x" << 30), ShardId("b")));
chunks.push_back(makeChunk(BSON("x" << 30), BSON("x" << MAXKEY), ShardId("b")));
auto routingInfo = makeRoutingInfo(KeyPattern(BSON("x" << 1)), chunks);
auto imbalanceCount = getMaxChunkImbalanceCount(routingInfo, shards, {});
ASSERT_EQ(2, imbalanceCount);
}
TEST_F(BalanceStatsTest, BalancedChunkInShardButNotZones) {
std::vector<ShardType> shards;
shards.push_back(makeShard("a", {"zone1"}));
shards.push_back(makeShard("b", {"zone1"}));
std::vector<ChunkType> chunks;
chunks.push_back(makeChunk(BSON("x" << MINKEY), BSON("x" << 10), ShardId("a")));
chunks.push_back(makeChunk(BSON("x" << 10), BSON("x" << 20), ShardId("a")));
chunks.push_back(makeChunk(BSON("x" << 20), BSON("x" << 30), ShardId("b")));
chunks.push_back(makeChunk(BSON("x" << 30), BSON("x" << 40), ShardId("b")));
chunks.push_back(makeChunk(BSON("x" << 40), BSON("x" << MAXKEY), ShardId("b")));
ZoneInfo zoneInfo;
uassertStatusOK(zoneInfo.addRangeToZone({BSON("x" << 10), BSON("x" << MAXKEY), "zone1"}));
auto routingInfo = makeRoutingInfo(KeyPattern(BSON("x" << 1)), chunks);
auto imbalanceCount = getMaxChunkImbalanceCount(routingInfo, shards, zoneInfo);
// Chunk counts:
// Default Zone: a: 1, b: 0
// zone1: a: 1, b: 3
ASSERT_EQ(2, imbalanceCount);
}
TEST_F(BalanceStatsTest, BalancedChunkInZonesButNotShards) {
std::vector<ShardType> shards;
shards.push_back(makeShard("a", {"zone1"}));
shards.push_back(makeShard("b", {"zone2"}));
shards.push_back(makeShard("c", {"zone2"}));
std::vector<ChunkType> chunks;
chunks.push_back(makeChunk(BSON("x" << MINKEY), BSON("x" << 10), ShardId("a")));
chunks.push_back(makeChunk(BSON("x" << 10), BSON("x" << 20), ShardId("a")));
chunks.push_back(makeChunk(BSON("x" << 20), BSON("x" << 30), ShardId("a")));
chunks.push_back(makeChunk(BSON("x" << 30), BSON("x" << 40), ShardId("a")));
chunks.push_back(makeChunk(BSON("x" << 40), BSON("x" << 50), ShardId("b")));
chunks.push_back(makeChunk(BSON("x" << 50), BSON("x" << MAXKEY), ShardId("c")));
ZoneInfo zoneInfo;
uassertStatusOK(zoneInfo.addRangeToZone({BSON("x" << MINKEY), BSON("x" << 40), "zone1"}));
uassertStatusOK(zoneInfo.addRangeToZone({BSON("x" << 40), BSON("x" << MAXKEY), "zone2"}));
auto routingInfo = makeRoutingInfo(KeyPattern(BSON("x" << 1)), chunks);
auto imbalanceCount = getMaxChunkImbalanceCount(routingInfo, shards, zoneInfo);
// Chunk counts:
// zone1: a: 4
// zone2: b:1, c: 1
ASSERT_EQ(0, imbalanceCount);
}
TEST_F(BalanceStatsTest, NoChunkInAShard) {
std::vector<ShardType> shards;
shards.push_back(makeShard("a", {"zone1"}));
shards.push_back(makeShard("b", {"zone1"}));
shards.push_back(makeShard("c"));
std::vector<ChunkType> chunks;
chunks.push_back(makeChunk(BSON("x" << MINKEY), BSON("x" << 10), ShardId("a")));
chunks.push_back(makeChunk(BSON("x" << 10), BSON("x" << 20), ShardId("b")));
chunks.push_back(makeChunk(BSON("x" << 20), BSON("x" << 30), ShardId("a")));
chunks.push_back(makeChunk(BSON("x" << 30), BSON("x" << MAXKEY), ShardId("b")));
ZoneInfo zoneInfo;
uassertStatusOK(zoneInfo.addRangeToZone({BSON("x" << MINKEY), BSON("x" << 20), "zone1"}));
auto routingInfo = makeRoutingInfo(KeyPattern(BSON("x" << 1)), chunks);
auto imbalanceCount = getMaxChunkImbalanceCount(routingInfo, shards, zoneInfo);
// Chunk counts:
// default zone: a: 1, b: 1, c: 0
// zone1: a: 1, b: 1
ASSERT_EQ(1, imbalanceCount);
}
} // namespace
} // namespace mongo
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