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https://issues.apache.org/jira/browse/HIVE-1211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12842346#action_12842346
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bc Wong commented on HIVE-1211:
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I'd like to retrieve the logs related to a particular query.
SessionState.out and SessionState.err are meant for that exact purpose.
Unfortunately, they don't capture the child processes' output, which currently
goes directly to System.out and System.err. Therefore this patch introduces
SessionState.childout and SessionState.childerr, which by default (null) do
nothing. But it allows anyone to hook a stream there to get the child's output.
> Tapping logs from child processes
> ---------------------------------
>
> Key: HIVE-1211
> URL: https://issues.apache.org/jira/browse/HIVE-1211
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Logging
> Reporter: bc Wong
> Assignee: bc Wong
> Attachments: HIVE-1211.1.patch
>
>
> Stdout/stderr from child processes (e.g. {{MapRedTask}}) are redirected to
> the parent's stdout/stderr. There is little one can do to to sort out which
> log is from which query.
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