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https://issues.apache.org/jira/browse/HIVE-1211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12840834#action_12840834
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bc Wong commented on HIVE-1211:
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I'd like to change it to go through the {{SessionState}} first.
{{SessionState}} will have two new {{PrintStream}}, called {{childOut}} and
{{childErr}}, which are similar to the current {{out}} and {{err}}. They let
users tap into the child's output. If they're null, then the child's out will
continue on to stdout/stderr.
And this doesn't break any existing users who aren't interested in the child's
output. They can tap into {{SessionState.out|err}} and ignore the new fields.
> 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
>
> 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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