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https://issues.apache.org/jira/browse/HDFS-10816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16034741#comment-16034741
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Eric Badger commented on HDFS-10816:
------------------------------------
Not sure why hadoopqa isn't running on the latest patches. [~kihwal], can you
kick the hadoopqa bot?
> TestComputeInvalidateWork#testDatanodeReRegistration fails due to race
> between test and replication monitor
> -----------------------------------------------------------------------------------------------------------
>
> Key: HDFS-10816
> URL: https://issues.apache.org/jira/browse/HDFS-10816
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Eric Badger
> Assignee: Eric Badger
> Attachments: HDFS-10816.001.patch, HDFS-10816.002.patch,
> HDFS-10816-branch-2.002.patch
>
>
> {noformat}
> java.lang.AssertionError: Expected invalidate blocks to be the number of DNs
> expected:<3> but was:<2>
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.failNotEquals(Assert.java:743)
> at org.junit.Assert.assertEquals(Assert.java:118)
> at org.junit.Assert.assertEquals(Assert.java:555)
> at
> org.apache.hadoop.hdfs.server.blockmanagement.TestComputeInvalidateWork.testDatanodeReRegistration(TestComputeInvalidateWork.java:160)
> {noformat}
> The test fails because of a race condition between the test and the
> replication monitor. The default replication monitor interval is 3 seconds,
> which is just about how long the test normally takes to run. The test deletes
> a file and then subsequently gets the namesystem writelock. However, if the
> replication monitor fires in between those two instructions, the test will
> fail as it will itself invalidate one of the blocks. This can be easily
> reproduced by removing the sleep() in the ReplicationMonitor's run() method
> in BlockManager.java, so that the replication monitor executes as quickly as
> possible and exacerbates the race.
> To fix the test all that needs to be done is to turn off the replication
> monitor.
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