[jira] [Reopened] (PIG-4412) Race condition in writing multiple outputs from STREAM op

["Daniel Dai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-4412?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Dai reopened PIG-4412:
-----------------------------

Seems TestStreaming also hang due to the patch and I don't have a quick answer why. Rollback the patch temporary until we figure out the reason.

> Race condition in writing multiple outputs from STREAM op
> ---------------------------------------------------------
>
>                 Key: PIG-4412
>                 URL: https://issues.apache.org/jira/browse/PIG-4412
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>            Reporter: Josh Wills
>            Assignee: Josh Wills
>             Fix For: 0.15.0
>
>         Attachments: PIG-4412.patch
>
>
> Basically copying the issue described here:
> http://stackoverflow.com/questions/28327044/pig-streaming-some-output-files-are-missing
> Roughly, I believe the issue is that there is a race condition in the code in the HadoopExecutableManager that moves multiple output files from a script into HDFS and the MapReduce task that is shutting down after it writes the last bits from the "main" output of the STREAM task. Pig needs to make sure that the ExecutableManager is closed (and thus the files are moved from the local dir to HDFS) before it returns the end-of-stream tuple to signal that the stream is finished.



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