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https://issues.apache.org/jira/browse/TEZ-1934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14278128#comment-14278128
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Jeff Zhang commented on TEZ-1934:
---------------------------------

onSourceTaskCompleted is only called in the main dispatcher thread. it should 
be fine without synchronized

> TestAMRecovery may fail due to the execution order is not determined 
> ---------------------------------------------------------------------
>
>                 Key: TEZ-1934
>                 URL: https://issues.apache.org/jira/browse/TEZ-1934
>             Project: Apache Tez
>          Issue Type: Bug
>            Reporter: Jeff Zhang
>            Assignee: Jeff Zhang
>         Attachments: TEZ-1934-1.patch
>
>
> task_1 is not guaranteed to been scheduled before task_0, so task_1 may 
> finished before task_0. While in the current TestAMRecovery, the finish of 
> task_1 is treated as the finished signal of vertex ( only 2 tasks in this 
> vertex) 



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