You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@tez.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2018/08/27 22:34:00 UTC

[jira] [Created] (TEZ-3984) Shuffle: Out of Band DME event sending causes errors

Gopal V created TEZ-3984:
----------------------------

             Summary: 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: 0.9.1, 0.8.4, 0.10.0
            Reporter: Gopal V


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.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)