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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6094) The same block can be counted twice towards safe mode threshold
Date Mon, 17 Mar 2014 17:33:43 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13938081#comment-13938081
] 

Jing Zhao commented on HDFS-6094:
---------------------------------

The latest patch looks good to me. +1.

> 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
>         Attachments: HDFS-6094.03.patch, HDFS-6904.01.patch, TestHASafeMode-output.txt
>
>
> {{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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