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https://issues.apache.org/jira/browse/HIVE-20169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16543297#comment-16543297
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BELUGA BEHR commented on HIVE-20169:
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For reference....
https://github.com/apache/hive/blob/ac6b2a3fb195916e22b2e5f465add2ffbcdc7430/ql/src/java/org/apache/hadoop/hive/ql/exec/ReduceSinkOperator.java#L540
> Print Final Rows Processed in MapOperator
> -----------------------------------------
>
> Key: HIVE-20169
> URL: https://issues.apache.org/jira/browse/HIVE-20169
> Project: Hive
> Issue Type: Improvement
> Components: Operators
> Affects Versions: 3.0.0, 4.0.0
> Reporter: BELUGA BEHR
> Priority: Minor
> Labels: newbie, noob
>
> https://github.com/apache/hive/blob/ac6b2a3fb195916e22b2e5f465add2ffbcdc7430/ql/src/java/org/apache/hadoop/hive/ql/exec/MapOperator.java#L573-L582
> This class emits a log message every time it a certain number of records are
> processed, but it does not print a final count.
> Overload the {{MapOperator}} class's {{closeOp}} method to print a final log
> message providing the total number of rows read by this mapper.
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