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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 00:44:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13731498#comment-13731498
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Jean-Daniel Cryans commented on HBASE-9141:
-------------------------------------------

Any reason you went with System.out.println instead of LOG?

initResources doesn't throw ZooKeeperConnectionException but it's listed.

Any chance of a unit test?

By default the tool should print the help if nothing is specified, right now it goes straight
to initiating the resources for nothing.

What happens right now if when doing recreate some znodes are already there? Should we move
them aside or delete them?
                
> 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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