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From "Jonathan Hsieh (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4842) [hbck] Fix intermittent failures on TestHBaseFsck.testHBaseFsck
Date Mon, 21 Nov 2011 23:37:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13154729#comment-13154729
] 

Jonathan Hsieh commented on HBASE-4842:
---------------------------------------

Hm.. this looks like a race or due to the lack of a rendezvous of some sort.  Up to HBASE-4378,
there was a 15000ms (yikes 15 sec!) sleep between the 'hbck -fix' call and the subsequent
'hbck' call that is supposed to be clean.  HBASE-4703 removed this.  

My hunch is that maybe the update to META the 'hbck -fix' does isn't seen on the second 'hbck'
run.

https://github.com/apache/hbase/commit/6ca0e79a6ac92190238d5cda56f787ab9702d7fc#L61L138
TestHBaseFsck.java:138 

                
> [hbck] Fix intermittent failures on TestHBaseFsck.testHBaseFsck
> ---------------------------------------------------------------
>
>                 Key: HBASE-4842
>                 URL: https://issues.apache.org/jira/browse/HBASE-4842
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Jonathan Hsieh
>
> Its seems that on the 0.92 branch in particular, TestHBaseFsck.testHBaseFsck is intermittently
failing.
> In the test, a region's assignment is purposely changed in META but not in ZK.  After
the equivalent of 'hbck -fix', a subsequent check that should be clean comes up with a new
ZK assignment but with META still being inconsistent with ZK.  The RS in ZK sometimes this
points to the same RS, but sometimes it "moves" to another ZK. 

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