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/**
* Copyright (C) 2022-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/db/repl/replica_set_aware_service.h"
#include "mongo/db/s/range_deletion_task_gen.h"
#include "mongo/db/s/sharding_runtime_d_params_gen.h"
#include "mongo/executor/network_interface_factory.h"
#include "mongo/executor/network_interface_thread_pool.h"
#include "mongo/executor/thread_pool_task_executor.h"
#include "mongo/s/catalog/type_chunk.h"
#include "mongo/util/future_util.h"
namespace mongo {
class RangeDeleterService : public ReplicaSetAwareServiceShardSvr<RangeDeleterService> {
public:
RangeDeleterService() = default;
static RangeDeleterService* get(ServiceContext* serviceContext);
static RangeDeleterService* get(OperationContext* opCtx);
private:
/*
* In memory representation of registered range deletion tasks. To each non-pending range
* deletion task corresponds a registered task on the service.
*/
class RangeDeletion : public ChunkRange {
public:
RangeDeletion(const RangeDeletionTask& task, SharedSemiFuture<void> completion)
: ChunkRange(task.getRange().getMin(), task.getRange().getMax()),
_completion(completion) {}
SharedSemiFuture<void> getCompletionFuture() const {
return _completion;
}
private:
// Marked ready once the range deletion has been fully processed
const SharedSemiFuture<void> _completion;
};
/*
* Internal comparator to sort ranges in _rangeDeletionTasks's sets.
*
* NB: it ONLY makes sense to use this on ranges that are comparable, meaning
* the ones based on the same key pattern (aka the ones belonging to the same
* sharded collection).
*/
struct RANGES_COMPARATOR {
bool operator()(const std::shared_ptr<ChunkRange>& a,
const std::shared_ptr<ChunkRange>& b) const {
return a->getMin().woCompare(b->getMin()) < 0;
}
};
// Keeping track of per-collection registered range deletion tasks
stdx::unordered_map<UUID, std::set<std::shared_ptr<ChunkRange>, RANGES_COMPARATOR>, UUID::Hash>
_rangeDeletionTasks;
// Mono-threaded executor processing range deletion tasks
std::shared_ptr<executor::TaskExecutor> _executor;
enum State { kInitializing, kUp, kDown };
AtomicWord<State> _state{kDown};
/* Acquire mutex only if service is up (for "user" operation) */
[[nodiscard]] stdx::unique_lock<Latch> _acquireMutexFailIfServiceNotUp() {
stdx::unique_lock<Latch> lg(_mutex_DO_NOT_USE_DIRECTLY);
uassert(
ErrorCodes::NotYetInitialized, "Range deleter service not up", _state.load() == kUp);
return lg;
}
/* Unconditionally acquire mutex (for internal operations) */
[[nodiscard]] stdx::unique_lock<Latch> _acquireMutexUnconditionally() {
stdx::unique_lock<Latch> lg(_mutex_DO_NOT_USE_DIRECTLY);
return lg;
}
// TODO SERVER-67642 implement fine-grained per-collection locking
// Protecting the access to all class members (DO NOT USE DIRECTLY: rely on
// `_acquireMutexUnconditionally` and `_acquireMutexFailIfServiceNotUp`)
Mutex _mutex_DO_NOT_USE_DIRECTLY = MONGO_MAKE_LATCH("RangeDeleterService::_mutex");
public:
/*
* Register a task on the range deleter service.
* Returns a future that will be marked ready once the range deletion will be completed.
*
* In case of trying to register an already existing task, the future will contain an error.
*/
SharedSemiFuture<void> registerTask(
const RangeDeletionTask& rdt,
SemiFuture<void>&& waitForActiveQueriesToComplete = SemiFuture<void>::makeReady());
/*
* Deregister a task from the range deleter service.
*/
void deregisterTask(const UUID& collUUID, const ChunkRange& range);
/*
* Returns the number of registered range deletion tasks for a collection
*/
int getNumRangeDeletionTasksForCollection(const UUID& collectionUUID);
/*
* Returns a future marked as ready when all overlapping range deletion tasks complete.
*
* NB: in case an overlapping range deletion task is registered AFTER invoking this method,
* it will not be taken into account. Handling this scenario is responsibility of the caller.
* */
SharedSemiFuture<void> getOverlappingRangeDeletionsFuture(const UUID& collectionUUID,
const ChunkRange& range);
/* ReplicaSetAwareServiceShardSvr implemented methods */
void onStepUpComplete(OperationContext* opCtx, long long term) override;
void onStepDown() override;
/*
* Returns the RangeDeleterService state with the following schema:
* {collectionUUIDA: [{min: x, max: y}, {min: w, max: z}....], collectionUUIDB: ......}
*/
BSONObj dumpState();
private:
/* Asynchronously register range deletions on the service. To be called on on step-up */
void _recoverRangeDeletionsOnStepUp();
/* ReplicaSetAwareServiceShardSvr "empty implemented" methods */
void onStartup(OperationContext* opCtx) override final{};
void onInitialDataAvailable(OperationContext* opCtx,
bool isMajorityDataAvailable) override final {}
void onShutdown() override final {}
void onStepUpBegin(OperationContext* opCtx, long long term) override final {}
void onBecomeArbiter() override final {}
};
} // namespace mongo
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