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https://issues.apache.org/jira/browse/TEZ-3984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jaume M reopened TEZ-3984:
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> 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
> Fix For: 0.10.0
>
> Attachments: TEZ-3984.1.patch, TEZ-3984.2.patch, TEZ-3984.3.patch,
> TEZ-3984.4.patch, TEZ-3984.5.patch, TEZ-3984.5.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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