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https://issues.apache.org/jira/browse/HDFS-10336?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yiqun Lin updated HDFS-10336:
-----------------------------
Attachment: HDFS-10336.002.patch
Thanks [~rakeshr] for review.
{quote}
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?
{quote}
I tested many times in my local, it seems good and runs quickly. I'm not so
sure for the case that exceeding the 30s now. Post the patch for your the
comments.
> 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, HDFS-10336.002.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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