HIVE-29647: Parallelize Parquet split generation directory listing on blob storage#6526
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deniskuzZ wants to merge 2 commits into
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HIVE-29647: Parallelize Parquet split generation directory listing on blob storage#6526deniskuzZ wants to merge 2 commits into
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Pull request overview
This PR (HIVE-29647) speeds up Parquet split generation on object/blob stores by overriding MapredParquetInputFormat.listStatus to list multiple recursive input directories concurrently, falling back to the default FileInputFormat listing for other scenarios.
Changes:
- Added a
listStatus(JobConf)override that parallelizes recursive directory listing when multiple input dirs are present on blob storage. - Introduced a dedicated worker thread pool and completion-based result collection for per-directory listings.
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What changes were proposed in this pull request?
Override
MapredParquetInputFormat.listStatusto list the input directories in parallel when there is more than one recursive input dir on a blob filesystem; all other cases defer to the default listing.Why are the changes needed?
Parquet split generation lists each input directory (typically one per partition) serially, which dominates planning time on object stores where every listing is a network round trip.
Does this PR introduce any user-facing change?
No
How was this patch tested?
Cluster (10 workers) TPC-DS scale 1Tb, external, parquet
query2 150sec (before) / 70 (after) # without the semijoins (see #6525)