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https://issues.apache.org/jira/browse/HIVE-12682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15095170#comment-15095170
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Prasanth Jayachandran commented on HIVE-12682:
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It actually replaces the taskId with the bucket number..
> Reducers in dynamic partitioning job spend a lot of time running
> hadoop.conf.Configuration.getOverlay
> -----------------------------------------------------------------------------------------------------
>
> Key: HIVE-12682
> URL: https://issues.apache.org/jira/browse/HIVE-12682
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 1.2.1
> Reporter: Carter Shanklin
> Assignee: Prasanth Jayachandran
> Attachments: HIVE-12682.1.patch, HIVE-12682.2.patch, reducer.png
>
>
> I tested this on Hive 1.2.1 but looks like it's still applicable to 2.0.
> I ran this query:
> {code}
> create table flights (
> …
> )
> PARTITIONED BY (Year int)
> CLUSTERED BY (Month)
> SORTED BY (DayofMonth) into 12 buckets
> STORED AS ORC
> TBLPROPERTIES("orc.bloom.filter.columns"="*")
> ;
> {code}
> (Taken from here:
> https://github.com/t3rmin4t0r/all-airlines-data/blob/master/ddl/orc.sql)
> I profiled just the reduce phase and noticed something odd, the attached
> graph shows where time was spent during the reducer phase.
> !reducer.png!
> Problem seems to relate to
> https://github.com/apache/hive/blob/branch-2.0/ql/src/java/org/apache/hadoop/hive/ql/exec/FileSinkOperator.java#L903
> /cc [~gopalv]
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