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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.
*/
#pragma once
#include "mongo/bson/bsonobj.h"
#include "mongo/db/s/balancer/balancer_policy.h"
#include "mongo/executor/task_executor.h"
#include "mongo/s/request_types/move_chunk_request.h"
#include "mongo/s/request_types/move_range_request_gen.h"
#include "mongo/s/shard_id.h"
namespace mongo {
class ChunkType;
class KeyPattern;
class MigrationSecondaryThrottleOptions;
/**
* Default values for MoveChunkRequests that the Scheduler might recover from a prior
* step-down or crash as part of its self-initialisation
*/
struct MigrationsRecoveryDefaultValues {
MigrationsRecoveryDefaultValues(int64_t maxChunkSizeBytes,
const MigrationSecondaryThrottleOptions& secondaryThrottle)
: maxChunkSizeBytes(maxChunkSizeBytes), secondaryThrottle(secondaryThrottle) {}
const int64_t maxChunkSizeBytes;
const MigrationSecondaryThrottleOptions secondaryThrottle;
};
/**
* Set of command-specific aggregations of submission settings
*/
struct MoveChunkSettings {
MoveChunkSettings(int64_t maxChunkSizeBytes,
const MigrationSecondaryThrottleOptions& secondaryThrottle,
bool waitForDelete)
: maxChunkSizeBytes(maxChunkSizeBytes),
secondaryThrottle(secondaryThrottle),
waitForDelete(waitForDelete) {}
int64_t maxChunkSizeBytes;
const MigrationSecondaryThrottleOptions secondaryThrottle;
bool waitForDelete;
};
struct SplitVectorSettings {
SplitVectorSettings()
: force(false),
maxSplitPoints(boost::none),
maxChunkObjects(boost::none),
maxChunkSizeBytes(boost::none) {}
SplitVectorSettings(boost::optional<long long> maxSplitPoints,
boost::optional<long long> maxChunkObjects,
boost::optional<long long> maxChunkSizeBytes,
bool force)
: force(force),
maxSplitPoints(maxSplitPoints),
maxChunkObjects(maxChunkObjects),
maxChunkSizeBytes(maxChunkSizeBytes) {}
bool force;
boost::optional<long long> maxSplitPoints;
boost::optional<long long> maxChunkObjects;
boost::optional<long long> maxChunkSizeBytes;
};
/**
* Interface for the asynchronous submission of chunk-related commands.
* Every method assumes that the ChunkType input parameter is filled up with information about
* version and location (shard ID).
**/
class BalancerCommandsScheduler {
public:
virtual ~BalancerCommandsScheduler() = default;
/**
* Triggers an asynchronous self-initialisation of the component,
* which will start accepting request<Command>() invocations.
*/
virtual void start(OperationContext* opCtx,
const MigrationsRecoveryDefaultValues& defaultValues) = 0;
/**
* Stops the scheduler and the processing of any outstanding and incoming request
* (which will be resolved as cancelled).
*/
virtual void stop() = 0;
virtual SemiFuture<void> requestMoveChunk(OperationContext* opCtx,
const MigrateInfo& migrateInfo,
const MoveChunkSettings& commandSettings,
bool issuedByRemoteUser = false) = 0;
virtual SemiFuture<void> requestMergeChunks(OperationContext* opCtx,
const NamespaceString& nss,
const ShardId& shardId,
const ChunkRange& chunkRange,
const ChunkVersion& version) = 0;
virtual SemiFuture<AutoSplitVectorResponse> requestAutoSplitVector(
OperationContext* opCtx,
const NamespaceString& nss,
const ShardId& shardId,
const BSONObj& keyPattern,
const BSONObj& minKey,
const BSONObj& maxKey,
int64_t maxChunkSizeBytes) = 0;
virtual SemiFuture<void> requestSplitChunk(OperationContext* opCtx,
const NamespaceString& nss,
const ShardId& shardId,
const ChunkVersion& collectionVersion,
const KeyPattern& keyPattern,
const BSONObj& minKey,
const BSONObj& maxKey,
const SplitPoints& splitPoints) = 0;
virtual SemiFuture<DataSizeResponse> requestDataSize(OperationContext* opCtx,
const NamespaceString& nss,
const ShardId& shardId,
const ChunkRange& chunkRange,
const ChunkVersion& version,
const KeyPattern& keyPattern,
bool estimatedValue) = 0;
virtual SemiFuture<void> requestMoveRange(OperationContext* opCtx,
const ShardsvrMoveRange& request,
const WriteConcernOptions& secondaryThrottleWC,
bool issuedByRemoteUser) = 0;
};
} // namespace mongo
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