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Date: Tue, 16 Aug 2016 21:43:20 +0000 (UTC)
From: "Zhe Zhang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12962873.1461729211000.322506.1471383800673@Atlassian.JIRA>
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Subject: [jira] [Updated] (HDFS-10336) TestBalancer failing intermittently
 because of not reseting UserGroupInformation completely
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archived-at: Tue, 16 Aug 2016 21:43:22 -0000


     [ https://issues.apache.org/jira/browse/HDFS-10336?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhe Zhang updated HDFS-10336:
-----------------------------
    Fix Version/s:     (was: 2.7.3)
                   2.7.4

> 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
>             Fix For: 2.8.0, 2.9.0, 2.7.4, 3.0.0-alpha1
>
>         Attachments: HDFS-10336.001.patch, HDFS-10336.002.patch, HDFS-10336.003-simplefix.patch, HDFS-10336.003.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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