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https://issues.apache.org/jira/browse/HADOOP-10015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13786670#comment-13786670
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Haohui Mai commented on HADOOP-10015:
-------------------------------------
Hi [~daryn],
I should have explained it more clearly.
During in-house testing, we (hortonworks) have observed a lot of these warnings
when doing distcp in secure clusters. To further demonstrate the problem, I
extract some basic logic in distcp into a unit test.
The log is definitely useful, but let's put it into the DEBUG level so that it
won't confuse the operators then.
> UserGroupInformation prints out excessive ERROR warnings
> --------------------------------------------------------
>
> Key: HADOOP-10015
> URL: https://issues.apache.org/jira/browse/HADOOP-10015
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Haohui Mai
> Assignee: Haohui Mai
> Attachments: HADOOP-10015.000.patch, HADOOP-10015.001.patch
>
>
> In UserGroupInformation::doAs(), it prints out a log at ERROR level whenever
> it catches an exception.
> However, in some cases IOExceptions are expected -- For example, the upp
> (e.g., calling exists() in filesystem). As a result, these error logs are
> benign but they are printed at the ERROR level, which confuses the operators.
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