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Posted to gitbox@hive.apache.org by GitBox <gi...@apache.org> on 2020/07/23 03:36:52 UTC

[GitHub] [hive] hsnusonic commented on pull request #1301: HIVE-23901: Overhead of Logger in ColumnStatsMerger damage the perfor…

hsnusonic commented on pull request #1301:
URL: https://github.com/apache/hive/pull/1301#issuecomment-662803187


   @belugabehr Thank you for pointing out that.
   
   The problem happens in [here](https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/columnstats/aggr/LongColumnStatsAggregator.java#L110) and other aggregators. When a table has many partitions, the merger is being instantiated repeatedly.
   
   Yeah, I think each subclass has its own Logger is a good idea.


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