[ https://issues.apache.org/jira/browse/YARN-6726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16100748#comment-16100748 ] 

Wangda Tan commented on YARN-6726:
----------------------------------

Thanks for explanations [~shanekumpf@gmail.com], I still not fully understanding #2.

I can understand the part why command goes to STDOUT, but I'm not sure why removing fflush can avoid this happen. Before the patch, output of container-executor (in time order).
a. Using command: <command> .... (fflush)
b. Output of {{docker inspect}} 

Even if we remove fflush from (a), I'm not sure how we can avoid it occurs in the output since it happens before (b). 

Also, I'm wondering if this is a correct solution, because this assumes inside c-e, there's no message should be allowed to happen before the actual docker command execution. Ideally we should either redirect docker command output to a separate file or could possibly use named pipe.

> Fix issues with docker commands executed by container-executor
> --------------------------------------------------------------
>
>                 Key: YARN-6726
>                 URL: https://issues.apache.org/jira/browse/YARN-6726
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>            Reporter: Shane Kumpf
>            Assignee: Shane Kumpf
>         Attachments: YARN-6726.001.patch
>
>
> docker inspect, rm, stop, etc are issued through container-executor. Commands other than docker run are not functioning properly.



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