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[improvement](scan) avoid too many scanners for file scan node (#25727)

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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.
This commit is contained in:
Mingyu Chen
2023-10-29 17:41:31 +08:00
committed by GitHub
parent 99b45e1938
commit e20cab64f4
35 changed files with 83 additions and 50 deletions
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3
be/src/vec/exec/vdata_gen_scan_node.cpp
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@ -137,7 +137,8 @@ Status VDataGenFunctionScanNode::close(RuntimeState* state) {
return ExecNode::close(state);
}
Status VDataGenFunctionScanNode::set_scan_ranges(const std::vector<TScanRangeParams>& scan_ranges) {
Status VDataGenFunctionScanNode::set_scan_ranges(RuntimeState* state,
const std::vector<TScanRangeParams>& scan_ranges) {
return _table_func->set_scan_ranges(scan_ranges);
}