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Posted to issues@drill.apache.org by "Deneche A. Hakim (JIRA)" <ji...@apache.org> on 2016/03/11 10:28:06 UTC

[jira] [Created] (DRILL-4496) Improve ParquetGroupScan.initFromMetadataCache() to read subfolders' cache files in parallel

Deneche A. Hakim created DRILL-4496:
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             Summary: Improve ParquetGroupScan.initFromMetadataCache() to read subfolders' cache files in parallel
                 Key: DRILL-4496
                 URL: https://issues.apache.org/jira/browse/DRILL-4496
             Project: Apache Drill
          Issue Type: Improvement
          Components: Storage - Parquet
    Affects Versions: 1.7.0
            Reporter: Deneche A. Hakim


As part of fixing DRILL-4376, ParquetGroupScan. initFromMetadataCache() was modified to read parquet metadata cache from selected subfolders.
This is done sequentially which can cause performance issues when a large number of subfolders are selected with a wildcard.
We should improve the method to read the cache files in parallel



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