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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 16:57:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573668#comment-13573668
] 

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

Let's cross that bridge when needed I'd say.

I think is only an issue where we store fully qualified paths outside of HDFS (such as in
ZK). Thinking now maybe we should check the replication code's usage of ZK (although it is
not immediately clear how that *should* behave).

Should I push to 0.94.6, since we're still discussing?
Maybe at least document? (It did cost the Salesforce Ops folks some gray hair in a late night
session, before they finally called me up).

                
> 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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