91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <map>
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#include <mutex>
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#include <thread>
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#include <unordered_map>
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#include <vector>
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#include "common/status.h"
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#include "gen_cpp/Types_types.h"
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#include "gutil/ref_counted.h"
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#include "util/thread.h"
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#include "util/uid_util.h"
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namespace doris {
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class TFetchDataResult;
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class BufferControlBlock;
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struct GetResultBatchCtx;
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class PUniqueId;
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// manage all result buffer control block in one backend
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class ResultBufferMgr {
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public:
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ResultBufferMgr();
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~ResultBufferMgr();
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// init Result Buffer Mgr, start cancel thread
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Status init();
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// create one result sender for this query_id
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// the returned sender do not need release
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// sender is not used when call cancel or unregister
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Status create_sender(const TUniqueId& query_id, int buffer_size,
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std::shared_ptr<BufferControlBlock>* sender);
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// fetch data, used by RPC
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Status fetch_data(const TUniqueId& fragment_id, TFetchDataResult* result);
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void fetch_data(const PUniqueId& finst_id, GetResultBatchCtx* ctx);
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// cancel
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Status cancel(const TUniqueId& fragment_id);
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// cancel one query at a future time.
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Status cancel_at_time(time_t cancel_time, const TUniqueId& query_id);
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private:
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typedef std::unordered_map<TUniqueId, std::shared_ptr<BufferControlBlock>> BufferMap;
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typedef std::map<time_t, std::vector<TUniqueId>> TimeoutMap;
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std::shared_ptr<BufferControlBlock> find_control_block(const TUniqueId& query_id);
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// used to erase the buffer that fe not clears
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// when fe crush, this thread clear the buffer avoid memory leak in this backend
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void cancel_thread();
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// lock for buffer map
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std::mutex _lock;
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// buffer block map
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BufferMap _buffer_map;
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// lock for timeout map
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std::mutex _timeout_lock;
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// map (cancel_time : query to be cancelled),
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// cancel time maybe equal, so use one list
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TimeoutMap _timeout_map;
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CountDownLatch _stop_background_threads_latch;
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scoped_refptr<Thread> _clean_thread;
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};
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// TUniqueId hash function used for std::unordered_map
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std::size_t hash_value(const TUniqueId& fragment_id);
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} // namespace doris
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