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https://issues.apache.org/jira/browse/HADOOP-12840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-12840.
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Resolution: Duplicate
duplicate of HADOOP-10315
> UGI to log@ debug stack traces when failing to find groups for a user
> ---------------------------------------------------------------------
>
> Key: HADOOP-12840
> URL: https://issues.apache.org/jira/browse/HADOOP-12840
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: security
> Affects Versions: 2.8.0
> Reporter: Steve Loughran
> Priority: Minor
>
> If {{UGI.getGroupNames()}} catches an IOE raised by
> {{groups.getGroups(getShortUserName())}} then it simply logs @ debug "No
> groups available for user". The text from the caught exception and stack
> trace are not printed.
> One IOException raised is the explicit "user not in groups" exception, but
> there could be other causes too —if that happens the entire problem will be
> missed.
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