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https://issues.apache.org/jira/browse/HDFS-6094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13932341#comment-13932341
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Arpit Agarwal commented on HDFS-6094:
-------------------------------------
No concrete diagnosis of this issue yet, I am still investigating.
> The same block can be counted twice towards safe mode threshold
> ---------------------------------------------------------------
>
> Key: HDFS-6094
> URL: https://issues.apache.org/jira/browse/HDFS-6094
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.4.0
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
>
> {{BlockManager#addStoredBlock}} can cause the same block can be counted
> towards safe mode threshold. We see this manifest via
> {{TestHASafeMode#testBlocksAddedWhileStandbyIsDown}} failures on Ubuntu. More
> details to follow in a comment.
> Exception details:
> {code}
> Time elapsed: 12.874 sec <<< FAILURE!
> java.lang.AssertionError: Bad safemode status: 'Safe mode is ON. The reported
> blocks 7 has reached the threshold 0.9990 of total blocks 6. The number of
> live datanodes 3 has reached the minimum number 0. Safe mode will be turned
> off automatically in 28 seconds.'
> at org.junit.Assert.fail(Assert.java:93)
> at org.junit.Assert.assertTrue(Assert.java:43)
> at
> org.apache.hadoop.hdfs.server.namenode.ha.TestHASafeMode.assertSafeMode(TestHASafeMode.java:493)
> at
> org.apache.hadoop.hdfs.server.namenode.ha.TestHASafeMode.testBlocksAddedWhileStandbyIsDown(TestHASafeMode.java:660)
> {code}
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