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https://issues.apache.org/jira/browse/HADOOP-10015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13944129#comment-13944129
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Tsz Wo Nicholas Sze commented on HADOOP-10015:
----------------------------------------------
Or we may simply remove the log message. It does not look useful.
UserGroupInformation.doAs(..) is a public API. If the caller wants to see the
exception message, they should print it when the exception is caught.
> UserGroupInformation prints out excessive ERROR warnings
> --------------------------------------------------------
>
> Key: HADOOP-10015
> URL: https://issues.apache.org/jira/browse/HADOOP-10015
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Haohui Mai
> Assignee: Nicolas Liochon
> Fix For: 3.0.0, 2.3.0, 2.4.0
>
> Attachments: 10015.v3.patch, 10015.v4.patch, 10015.v5.patch,
> HADOOP-10015.000.patch, HADOOP-10015.001.patch, HADOOP-10015.002.patch
>
>
> In UserGroupInformation::doAs(), it prints out a log at ERROR level whenever
> it catches an exception.
> However, it prints benign warnings in the following paradigm:
> {noformat}
> try {
> ugi.doAs(new PrivilegedExceptionAction<FileStatus>() {
> @Override
> public FileStatus run() throws Exception {
> return fs.getFileStatus(nonExist);
> }
> });
> } catch (FileNotFoundException e) {
> }
> {noformat}
> For example, FileSystem#exists() follows this paradigm. Distcp uses this
> paradigm too. The exception is expected therefore there should be no ERROR
> logs printed in the namenode logs.
> Currently, the user quickly finds out that the namenode log is quickly filled
> by _benign_ ERROR logs when he or she runs distcp in secure set up. This
> behavior confuses the operators.
> This jira proposes to move the log to DEBUG level.
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