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https://issues.apache.org/jira/browse/HADOOP-10315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ted Yu reassigned HADOOP-10315:
-------------------------------

    Assignee: Ted Yu

> Log the original exception when getGroups() fail in UGI.
> --------------------------------------------------------
>
>                 Key: HADOOP-10315
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10315
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.23.10, 2.2.0
>            Reporter: Kihwal Lee
>            Assignee: Ted Yu
>         Attachments: HADOOP-10315.v1.patch
>
>
> In UserGroupInformation, getGroupNames() swallows the original exception. 
> There have been many occasions that more information on the original 
> exception could have helped.
> {code}
>   public synchronized String[] getGroupNames() {
>     ensureInitialized();
>     try {
>       List<String> result = groups.getGroups(getShortUserName());
>       return result.toArray(new String[result.size()]);
>     } catch (IOException ie) {
>       LOG.warn("No groups available for user " + getShortUserName());
>       return new String[0];
>     }
>   }
> {code}



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