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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10426) TestPendingInvalidateBlock failed in trunk
Date Wed, 18 May 2016 12:19:12 GMT
Yiqun Lin created HDFS-10426:

             Summary: TestPendingInvalidateBlock failed in trunk
                 Key: HDFS-10426
                 URL: https://issues.apache.org/jira/browse/HDFS-10426
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: test
            Reporter: Yiqun Lin
            Assignee: Yiqun Lin

The test {{TestPendingInvalidateBlock}} failed sometimes. The stack info:
 Time elapsed: 7.703 sec  <<< FAILURE!
java.lang.AssertionError: expected:<2> but was:<1>
	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.junit.Assert.assertEquals(Assert.java:542)
	at org.apache.hadoop.hdfs.server.blockmanagement.TestPendingInvalidateBlock.testPendingDeletion(TestPendingInvalidateBlock.java:92)
It looks that the {{invalidateBlock}} has been removed before we do the check
    // restart NN
    dfs.delete(foo, true);
    Assert.assertEquals(0, cluster.getNamesystem().getBlocksTotal());
    Assert.assertEquals(REPLICATION, cluster.getNamesystem()
And I look into the related configurations. I found the property {{dfs.namenode.replication.interval}}
was just set as 1 second in this test. And after the delay time of {{dfs.namenode.startup.delay.block.deletion.sec}}
and the delete operation was slowly, it will cause this case. We can see the stack info before,
the failed test costs 7.7s more than 5+1 second.

Two methods will improve this.

* Increase the time of {{dfs.namenode.startup.delay.block.deletion.sec}}
* Increase the time of {{dfs.namenode.replication.interval}}

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