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From "Himanshu Vashishtha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9141) Replication Znodes Backup Tool
Date Thu, 08 Aug 2013 17:07:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13733693#comment-13733693
] 

Himanshu Vashishtha commented on HBASE-9141:
--------------------------------------------

The attached patch has the following changes:

1) Include a test cases where it create-->serializes-->delete existing--> restores
znodes. It checks whether the data is restored or not, etc.

2) The znodes are saved with relative path, starting from replication base znode (by default,
from replication/). This is useful in case a user wants to 
restore under a different hbase root znode.

3) Options to delete existing znode (after taking the backup, or before restoring the znodes);
option to delete the backup file after successful restoration.

4) Other nits suggested by Ted. More help documentation on "moving" znodes.


                
> 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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