[jira] [Commented] (HBASE-21444) Recover meta in case of long ago dead region server appear in meta znode

["Allan Yang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-21444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16677578#comment-16677578 ] 

Allan Yang commented on HBASE-21444:
------------------------------------

The patch can't apply to branch-2.0, can you rebase?
This may be similar with HBASE-21035, you can refer to some discussions there.

> Recover meta in case of long ago dead region server appear in meta znode
> ------------------------------------------------------------------------
>
>                 Key: HBASE-21444
>                 URL: https://issues.apache.org/jira/browse/HBASE-21444
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.2
>            Reporter: Ankit Singhal
>            Assignee: Ankit Singhal
>            Priority: Major
>         Attachments: HBASE-21444.branch-2.0.001.patch
>
>
> Ambari metric server uses HBase as storage and currently have different znodes (/hbase-unsecure and /hbase-secure) to differentiate secure/unsecure deployment of HBase.  
> As it also supports the rollback of the cluster from kerberised to non-kerberised (includes step of changing znode from /hbase-secure to /hbase-unsecure) , but with HBase 2.0 , meta-region-server znode from old zookeeper znodes will have regionserver which was long ago gone and there will be no procedure to transition it, resulting it to get stuck for lifetime.
> One option is to clear the znodes before rollingback but as it used to work with prior releases due to RecoverMetaProcedure, the ask is if we can fix meta assignment in case the wrong state is available in znode.



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