SERVER-52779 Added new coordinator to create collection with the new shard collection path

1 files changed, 103 insertions, 0 deletions

diff --git a/src/mongo/db/s/create_collection_coordinator.h b/src/mongo/db/s/create_collection_coordinator.h
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+++ b/src/mongo/db/s/create_collection_coordinator.h
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+/**
+ *    Copyright (C) 2020-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/operation_context.h"
+#include "mongo/db/s/config/initial_split_policy.h"
+#include "mongo/db/s/shard_filtering_metadata_refresh.h"
+#include "mongo/db/s/sharding_ddl_coordinator.h"
+#include "mongo/s/request_types/sharded_ddl_commands_gen.h"
+#include "mongo/util/future.h"
+
+namespace mongo {
+
+class CreateCollectionCoordinator final
+    : public ShardingDDLCoordinator,
+      public std::enable_shared_from_this<CreateCollectionCoordinator> {
+public:
+    CreateCollectionCoordinator(OperationContext* opCtx, const ShardsvrCreateCollection& request);
+
+    /**
+     * Returns the information of the newly created collection, or the already existing one. It must
+     * be called after a successfull execution of run.
+     */
+    const CreateCollectionResponse& getResultOnSuccess() {
+        return *_result;
+    }
+
+private:
+    SemiFuture<void> runImpl(std::shared_ptr<executor::TaskExecutor> executor) override;
+
+    /**
+     * Performs all required checks before holding the critical sections.
+     */
+    void _checkCommandArguments(OperationContext* opCtx);
+
+    /**
+     * Ensures the collection is created locally and has the appropiate shard index.
+     */
+    void _createCollectionAndIndexes(OperationContext* opCtx);
+
+    /**
+     * Given the appropiate split policy, create the initial chunks.
+     */
+    void _createChunks(OperationContext* opCtx);
+
+    /**
+     * If the optimized path can be taken, ensure the collection is already created in all the
+     * participant shards.
+     */
+    void _createCollectionOnNonPrimaryShards(OperationContext* opCtx);
+
+    /**
+     * Does the following writes:
+     * 1. Updates the config.collections entry for the new sharded collection
+     * 2. Updates config.chunks entries for the new sharded collection
+     */
+    void _commit(OperationContext* opCtx);
+
+    /**
+     * Refresh all participant shards and log creation.
+     */
+    void _cleanup(OperationContext* opCtx);
+
+    ServiceContext* _serviceContext;
+    const ShardsvrCreateCollection _request;
+    const NamespaceString& _nss;
+
+    boost::optional<ShardKeyPattern> _shardKeyPattern;
+    boost::optional<BSONObj> _collation;
+    boost::optional<UUID> _collectionUUID;
+    std::unique_ptr<InitialSplitPolicy> _splitPolicy;
+    InitialSplitPolicy::ShardCollectionConfig _initialChunks;
+    boost::optional<CreateCollectionResponse> _result;
+};
+
+}  // namespace mongo