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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9141) Replication Znodes Backup Tool
Date Wed, 07 Aug 2013 21:23:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13732764#comment-13732764
] 

Jean-Daniel Cryans commented on HBASE-9141:
-------------------------------------------

bq. This throws it

Ugh you're right but this is kinda dumb since ZKCE is a IOE.

bq. If znode is there, it doesn't do anything. 

I haven't tried it but I don't see the check in the code, it just tries to create the znodes
in recreateZnodes(). Have you tried it?

Also, where you do mention in the tool that the znodes need to be deleted by the user? Can
we not rely on having the user doing it and move them aside for them?

bq. Hmm, that's a bit tricky I think. I would try to come up with one.

I don't see how, you just need ZK and the local filesystem. Are you saying this because it
needs to read the old format?
                
> Replication Znodes Backup Tool
> ------------------------------
>
>                 Key: HBASE-9141
>                 URL: https://issues.apache.org/jira/browse/HBASE-9141
>             Project: HBase
>          Issue Type: Improvement
>          Components: migration, Replication
>    Affects Versions: 0.94.10
>            Reporter: Himanshu Vashishtha
>            Assignee: Himanshu Vashishtha
>             Fix For: 0.95.2
>
>         Attachments: HBase-9141.patch
>
>
> While migrating to 0.96, we recommend deleting old znodes so users not face issues like
HBASE-7766, and let HBase create them out of box.
> Though HBase tends to store only ephemeral data in zookeeper, replication has a different
approach. Almost all of its data (state, peer info, logs, etc) is present in zookeeper. We
would like to preserve them in order to not do re-adding of peers, and ensuring complete replication
after we have migrated to 0.96. 
> This jira adds a tool to serialize/de-serialize replication znodes to the underlying
filesystem. This could be used while migrating to 0.96.0.

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