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https://issues.apache.org/jira/browse/TEZ-2363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14511056#comment-14511056
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Gopal V commented on TEZ-2363:
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Yes, I have a fix - resolving that as duplicate.
> Counters: off by 1 error for REDUCE_INPUT_GROUPS counter
> --------------------------------------------------------
>
> Key: TEZ-2363
> URL: https://issues.apache.org/jira/browse/TEZ-2363
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Gopal V
> Assignee: Gopal V
> Priority: Minor
>
> The reduce input key groups are not incremented for the first key in
> operation, only for the second key does it increment in moveToNext() ->
> nextKey() -> inputKeyCounter.increment(1);
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