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https://issues.apache.org/jira/browse/TEZ-3984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596751#comment-16596751
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Gopal V commented on TEZ-3984:
------------------------------
The patch looks good - minor NIT, the OrderedPartitionedKVOutput event lists
need to be prefixed.
The sorter events need to be inserted at 0, not appended (for event order
related issues - which doesn't exist today, because it is likely to be no
events in generateEvents but is neater to see them in order in the AM).
> Shuffle: Out of Band DME event sending causes errors
> ----------------------------------------------------
>
> Key: TEZ-3984
> URL: https://issues.apache.org/jira/browse/TEZ-3984
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.8.4, 0.9.1, 0.10.0
> Reporter: Gopal V
> Assignee: Jaume M
> Priority: Critical
> Labels: correctness
> Attachments: TEZ-3984.1.patch
>
>
> In case of a task Input throwing an exception, the outputs are also closed in
> the LogicalIOProcessorRuntimeTask.cleanup().
> Cleanup ignore all the events returned by output close, however if any output
> tries to send an event out of band by directly calling
> outputContext.sendEvents(events), then those events can reach the AM before
> the task failure is reported.
> This can cause correctness issues with shuffle since zero sized events can be
> sent out due to an input failure and downstream tasks may never reattempt a
> fetch from the valid attempt.
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