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branch-4.0: [opt](scanner) set number of file scanner to max_scanners_concurrency(#59622) #59696

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Merged
yiguolei merged 1 commit into from
Jan 9, 2026
Merged

branch-4.0: [opt](scanner) set number of file scanner to max_scanners_concurrency(#59622) #59696

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10 changes: 7 additions & 3 deletions be/src/pipeline/exec/file_scan_operator.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -111,9 +111,13 @@ void FileScanLocalState::set_scan_ranges(RuntimeState* state,
auto calc_max_scanners = [&](int parallel_instance_num) -> int {
int max_scanners = vectorized::ScannerScheduler::default_remote_scan_thread_num() /
parallel_instance_num;
if (should_run_serial()) {
max_scanners = 1;
}
// For external tables, each scanner is not bound to specific splits.
// Instead, when a scanner is scheduled, it dynamically fetches the next scan range
// from a unified split source for scanning.
// Therefore, the number of scanners only needs to match "max_scanners_concurrency"
// to ensure full-speed execution.
// For 32 core node, the default "max_scanners_concurrency" should be 16
max_scanners = std::min(max_scanners, max_scanners_concurrency(state));
return max_scanners;
};

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