e20cab64f4
In previous, when using file scan node(eq, querying hive table), the max number of scanner for each scan node will be the `doris_scanner_thread_pool_thread_num`(default is 48). And if the query parallelism is N, the total number of scanner would be 48 * N, which is too many. In this PR, I change the logic, the max number of scanner for each scan node will be the `doris_scanner_thread_pool_thread_num / query parallelism`. So that the total number of scanners will be up to `doris_scanner_thread_pool_thread_num`. Reduce the number of scanner can significantly reduce the memory usage of query.
84 lines
2.7 KiB
C++
84 lines
2.7 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 <memory>
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#include "exec/scan_node.h"
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#include "runtime/descriptors.h"
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#include "vec/exec/scan/mysql_scanner.h"
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namespace doris {
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class TupleDescriptor;
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class RuntimeState;
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class Status;
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namespace vectorized {
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class VMysqlScanNode : public ScanNode {
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public:
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VMysqlScanNode(ObjectPool* pool, const TPlanNode& tnode, const DescriptorTbl& descs);
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~VMysqlScanNode() override = default;
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// initialize mysql_scanner, and create text_serde.
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Status prepare(RuntimeState* state) override;
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// Start MySQL scan using mysql_scanner.
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Status open(RuntimeState* state) override;
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// Fill the next block by calling next() on the mysql_scanner,
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// converting text data in MySQL cells to binary data.
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Status get_next(RuntimeState* state, vectorized::Block* block, bool* eos) override;
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// Close the mysql_scanner, and report errors.
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Status close(RuntimeState* state) override;
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// No use
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Status set_scan_ranges(RuntimeState* state,
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const std::vector<TScanRangeParams>& scan_ranges) override;
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private:
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// Write debug string of this into out.
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void debug_string(int indentation_level, std::stringstream* out) const override;
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bool _is_init;
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MysqlScannerParam _my_param;
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// Name of Mysql table
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std::string _table_name;
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// Tuple id resolved in prepare() to set _tuple_desc;
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TupleId _tuple_id;
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// select columns
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std::vector<std::string> _columns;
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// where clause
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std::vector<std::string> _filters;
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// Descriptor of tuples read from MySQL table.
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const TupleDescriptor* _tuple_desc;
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// Tuple index in tuple row.
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int _slot_num;
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// Jni helper for scanning an HBase table.
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std::unique_ptr<MysqlScanner> _mysql_scanner;
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// Helper class for converting text to other types;
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DataTypeSerDeSPtrs _text_serdes;
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DataTypeSerDe::FormatOptions _text_formatOptions;
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};
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} // namespace vectorized
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} // namespace doris
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