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Date: Fri, 18 May 2012 17:43:08 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-5926) Delete the master znode after a
 master crash
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    [ https://issues.apache.org/jira/browse/HBASE-5926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279005#comment-13279005 ] 

stack commented on HBASE-5926:
------------------------------

I'll fix Ted comments on commit.
                
> Delete the master znode after a master crash
> --------------------------------------------
>
>                 Key: HBASE-5926
>                 URL: https://issues.apache.org/jira/browse/HBASE-5926
>             Project: HBase
>          Issue Type: Improvement
>          Components: master, scripts
>    Affects Versions: 0.96.0
>            Reporter: nkeywal
>            Assignee: nkeywal
>            Priority: Minor
>             Fix For: 0.96.0
>
>         Attachments: 5926.v10.patch, 5926.v11.patch, 5926.v13.patch, 5926.v14.patch, 5926.v6.patch, 5926.v8.patch, 5926.v9.patch
>
>
> This is the continuation of the work done in HBASE-5844.
> But we can't apply exactly the same strategy: for the region server, there is a znode per region server, while for the master & backup master there is a single znode for both.
> So if we apply the same strategy as for a regionserver, we may have this scenario:
> 1) Master starts
> 2) Backup master starts
> 3) Master dies
> 4) ZK detects it
> 5) Backup master receives the update from ZK
> 6) Backup master creates the new master node and become the main master
> 7) Previous master script continues
> 8) Previous master script deletes the master node in ZK
> 9) => issue: we deleted the node just created by the new master
> This should not happen often (usually the znode will be deleted soon enough), but it can happen.

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