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https://issues.apache.org/jira/browse/TEZ-4256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17245185#comment-17245185
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Rajesh Balamohan commented on TEZ-4256:
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Adding one more profiler screenshot for ref.
!Screenshot 2020-12-07 at 6.15.19 PM.png|width=901,height=484!
> Reduce key comparisons in reducer side
> --------------------------------------
>
> Key: TEZ-4256
> URL: https://issues.apache.org/jira/browse/TEZ-4256
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Priority: Major
> Labels: performance
> Attachments: Screenshot 2020-12-07 at 12.00.08 PM.png, Screenshot
> 2020-12-07 at 6.15.19 PM.png, TEZ-4256.1.patch
>
>
> !Screenshot 2020-12-07 at 12.00.08 PM.png|width=1025,height=366!
>
> [https://github.com/apache/tez/blob/master/tez-runtime-library/src/main/java/org/apache/tez/runtime/library/common/shuffle/orderedgrouped/MergeManager.java#L1131]
>
> Returning {{KeyState (NEW_KEY/SAME_KEY)}} based on
> {{TezRawKeyValueIterator::isSameKey}} would helo in reducing key comparisons
> in reducer side.
>
> {color:#828eba}kvIter{color}
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