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From "Rakesh R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10336) TestBalancer failing intermittently because of not reseting UserGroupInformation completely
Date Tue, 28 Jun 2016 09:46:57 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15352687#comment-15352687

Rakesh R commented on HDFS-10336:

Thanks [~linyiqun] for the contribution. Could you please rebase the patch as HADOOP-13251
has modified {{UserGroupInformation#reset}} code.

bq. 1st. The test TestBalancer#testBalancerWithKeytabs executed timeout.
Increasing timeout is one approach, but am interested to know the reason behind 300000millis
timeout. Did you see any specific case for exceeding the current value?
bq. 2nd. The test TestBalancer#testBalancerWithKeytabs reset the UGI not completely sometimes
in the finally block.
+1 for {{UserGroupInformation.reset();}}

> TestBalancer failing intermittently because of not reseting UserGroupInformation completely
> -------------------------------------------------------------------------------------------
>                 Key: HDFS-10336
>                 URL: https://issues.apache.org/jira/browse/HDFS-10336
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>         Attachments: HDFS-10336.001.patch
> The unit test {{TestBalancer}} failed sometimes. 
> I looked for the reason. I found two main reasons causing this.
> * 1st. The test {{TestBalancer#testBalancerWithKeytabs}} executed timeout.
> {code}
> org.apache.hadoop.hdfs.server.balancer.TestBalancer
> testBalancerWithKeytabs(org.apache.hadoop.hdfs.server.balancer.TestBalancer)  Time elapsed:
300.41 sec  <<< ERROR!
> java.lang.Exception: test timed out after 300000 milliseconds
> 	at java.lang.Thread.sleep(Native Method)
> 	at org.apache.hadoop.hdfs.server.balancer.Dispatcher.waitForMoveCompletion(Dispatcher.java:1122)
> 	at org.apache.hadoop.hdfs.server.balancer.Dispatcher.dispatchBlockMoves(Dispatcher.java:1096)
> 	at org.apache.hadoop.hdfs.server.balancer.Dispatcher.dispatchAndCheckContinue(Dispatcher.java:1060)
> 	at org.apache.hadoop.hdfs.server.balancer.Balancer.runOneIteration(Balancer.java:635)
> 	at org.apache.hadoop.hdfs.server.balancer.Balancer.run(Balancer.java:689)
> 	at org.apache.hadoop.hdfs.server.balancer.TestBalancer.testUnknownDatanode(TestBalancer.java:1098)
> 	at org.apache.hadoop.hdfs.server.balancer.TestBalancer.access$000(TestBalancer.java:125)
> {code}
> * 2nd. The test {{TestBalancer#testBalancerWithKeytabs}} reset the {{UGI}} not completely
sometimes in the finally block. And this affected the other unit tests threw {{IOException}},
like this:
> {code}
> testBalancerWithNonZeroThreadsForMove(org.apache.hadoop.hdfs.server.balancer.TestBalancer)
 Time elapsed: 0 sec  <<< ERROR!
> java.io.IOException: Running in secure mode, but config doesn't have a keytab
> 	at org.apache.hadoop.security.SecurityUtil.login(SecurityUtil.java:300)
> {code}
> And there were not only one test will be affected by this. We should add a line to do
before doing reset {{UGI}} operation and can avoid the potenial exception happens.
> {code}
> UserGroupInformation.reset();
> {code}

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