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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7723) Remove NN URI from ZK splitlogs.
Date Thu, 07 Feb 2013 03:51:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573150#comment-13573150
] 

Lars Hofhansl commented on HBASE-7723:
--------------------------------------

The problem occurs every time when the hbase root is changed in any way.
In our case we moved from a single NN to an HA NN. In that case the host portion of the URI
changes.
Similarly one could imagine that the hbase root Dir is moved.
                
> Remove NN URI from ZK splitlogs.
> --------------------------------
>
>                 Key: HBASE-7723
>                 URL: https://issues.apache.org/jira/browse/HBASE-7723
>             Project: HBase
>          Issue Type: Bug
>          Components: hadoop2, master
>    Affects Versions: 0.92.0
>            Reporter: Kevin Odell
>            Assignee: Himanshu Vashishtha
>             Fix For: 0.96.0, 0.94.5
>
>         Attachments: 7723-0.94-minimal.txt, 7723-0.94-simple.txt, HBASE-7723-94.patch,
HBASE-7723-94-v2.patch, HBASE-7723-94-v3.patch, HBASE-7723-94-v4.patch, HBASE-7723-94-v5.patch,
HBASE-7723-trunk-v1.patch, HBASE-7723-trunk-v2.patch
>
>
> When moving to HDFS HA or removing HA we end up changing the NN namespace.  This can
cause the HMaster not to start up fully due to trying to split phantom HLogs pointing to the
wrong FS - java.lang.IllegalArgumentException: Wrong FS: error messages.  The HLogs in question
might not even be on HDFS anymore.  You have to go in a manually clear out the ZK splitlogs
directory to get HBase to properly boot up.

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