[jira] [Commented] (TEZ-3849) Combiner+PipelinedSorter silently drops records

["Gopal V (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TEZ-3849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16193431#comment-16193431 ] 

Gopal V commented on TEZ-3849:
------------------------------

[~jacobtolar]: updated the JIRA title to indicate the issue is with combiners + sorter (& something like terasort won't reproduce the issue, because of that).

> Combiner+PipelinedSorter silently drops records
> -----------------------------------------------
>
>                 Key: TEZ-3849
>                 URL: https://issues.apache.org/jira/browse/TEZ-3849
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Jacob Tolar
>            Assignee: Jacob Tolar
>         Attachments: TEZ-3849.1.patch, TEZ-3849.2.patch
>
>
> This bug was introduced in https://github.com/apache/tez/commit/a47e8fcbea5eeab5a7cf812271d329524cc02dba?diff=split 
> when combiner != null, the change in this commit passes kvIter with next() having already been called. This ends up (silently) dropping the first record in the partition. 
> Will submit PR and attach patch. [~jeagles], not sure if this is the way you want to fix or not but it does fix my tests.



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