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From "Deneche A. Hakim (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-4496) Improve ParquetGroupScan.initFromMetadataCache() to read subfolders' cache files in parallel
Date Fri, 11 Mar 2016 09:28:06 GMT
Deneche A. Hakim created DRILL-4496:
---------------------------------------

             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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