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https://issues.apache.org/jira/browse/HDFS-9865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lin Yiqun updated HDFS-9865:
----------------------------
Attachment: HDFS-9865.002.patch
> TestBlockReplacement fails intermittently in trunk
> --------------------------------------------------
>
> Key: HDFS-9865
> URL: https://issues.apache.org/jira/browse/HDFS-9865
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Affects Versions: 2.7.1
> Reporter: Lin Yiqun
> Assignee: Lin Yiqun
> Attachments: HDFS-9865.001.patch, HDFS-9865.002.patch
>
>
> I found the testcase {{TestBlockReplacement}} will be failed sometimes in
> testing. And I looked the unit log, always I will found these infos:
> {code}
> org.apache.hadoop.hdfs.server.datanode.TestBlockReplacement
> testDeletedBlockWhenAddBlockIsInEdit(org.apache.hadoop.hdfs.server.datanode.TestBlockReplacement)
> Time elapsed: 8.764 sec <<< FAILURE!
> java.lang.AssertionError: The block should be only on 1 datanode
> expected:<1> 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.datanode.TestBlockReplacement.testDeletedBlockWhenAddBlockIsInEdit(TestBlockReplacement.java:436)
> {code}
> Finally I found the reason is that not deleting block completely in
> testDeletedBlockWhenAddBlockIsInEdit cause the datanode's num not correct.
> And the time to wait FsDatasetAsyncDsikService to delete the block is not a
> accurate value.
> {code}
> LOG.info("replaceBlock: " + replaceBlock(block,
> (DatanodeInfo)sourceDnDesc, (DatanodeInfo)sourceDnDesc,
> (DatanodeInfo)destDnDesc));
> // Waiting for the FsDatasetAsyncDsikService to delete the block
> Thread.sleep(3000);
> {code}
> When I adjust this time to 1 seconds, it will be always failed. Also the 3
> seconds in test is not a accurate value too. We should adjust these code's
> logic to a better way such as waiting for the block to be replicated in
> testDecommision.
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