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.
82 lines
2.6 KiB
C++
82 lines
2.6 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 <iosfwd>
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#include <memory>
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#include <string>
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#include <vector>
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#include "common/global_types.h"
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#include "exec/scan_node.h"
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#include "exec/schema_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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class DescriptorTbl;
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class ObjectPool;
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class TPlanNode;
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class TScanRangeParams;
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namespace vectorized {
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class Block;
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class VSchemaScanNode : public ScanNode {
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public:
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VSchemaScanNode(ObjectPool* pool, const TPlanNode& tnode, const DescriptorTbl& descs);
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~VSchemaScanNode() override;
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Status prepare(RuntimeState* state) override;
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Status get_next(RuntimeState* state, vectorized::Block* block, bool* eos) override;
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// Prepare conjuncts, create Schema columns to slots mapping
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// initialize schema_scanner
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Status init(const TPlanNode& tnode, RuntimeState* state = nullptr) override;
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// Start Schema scan using schema_scanner.
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Status open(RuntimeState* state) override;
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// Close the schema_scanner, and report errors.
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Status close(RuntimeState* state) override;
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private:
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// this is no use in this class
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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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// 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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const std::string _table_name;
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SchemaScannerParam _scanner_param;
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// Tuple id resolved in prepare() to set _tuple_desc;
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TupleId _tuple_id;
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// Descriptor of dest tuples
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const TupleDescriptor* _dest_tuple_desc;
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// Tuple index in tuple row.
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int _tuple_idx;
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// slot num need to fill in and return
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int _slot_num;
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// Jni helper for scanning an schema table.
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std::unique_ptr<SchemaScanner> _schema_scanner;
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};
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} // namespace vectorized
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} // namespace doris
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