[jira] [Commented] (SPARK-21490) SparkLauncher may fail to redirect streams

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-21490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16095445#comment-16095445 ] 

Apache Spark commented on SPARK-21490:
--------------------------------------

User 'vanzin' has created a pull request for this issue:
https://github.com/apache/spark/pull/18696

> SparkLauncher may fail to redirect streams
> ------------------------------------------
>
>                 Key: SPARK-21490
>                 URL: https://issues.apache.org/jira/browse/SPARK-21490
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.2.0
>            Reporter: Marcelo Vanzin
>            Priority: Minor
>
> While investigating a different issue, I noticed that the redirection handling in SparkLauncher is faulty.
> In the default case or when users use only log redirection, things should work fine.
> But if users try to redirect just the stdout of a child process without redirecting stderr, the launcher won't detect that and the child process may hang because stderr is not being read and its buffer fills up.
> The code should detect these cases and redirect any streams that haven't been explicitly redirected by the user.



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