[jira] [Commented] (HBASE-9141) Replication Znodes Backup Tool

["Himanshu Vashishtha (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-9141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13731131#comment-13731131 ] 

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

Patch to add replication znode migration tool. Sample usage:
{code}
bin/hbase org.apache.hadoop.hbase.replication.ReplicationZnodesBackup -h
usage: TakeReplicationZnodesBackup [-d] [-h] [-p <arg>] [-restore]
 -d,--deleteOriginalZnodes       Delete the original replication znodes
 -h,--help                       Help
 -p,--path <arg>                 path where to store the backup file under
                                 hbase.rootdir
 -restore,--restoreFromABackup   Whether to restore replication znodes
                                 from a backup file
The backup file name is replication-znodes-backup.
In case no parent directory is provided, it stores the replication znodes under hbase.rootdir.
Example Usage:
 Let's say the current root hbase znode is /hbase-94. We want to do a  backup of all the znodes under /hbase-94/replication. 
 $ $HBASE_HOME/bin/hbase org.apache.hadoop.hbase.replication.ReplicationZnodesBackup -p myBackup

It will serializes all the znodes under /hbase-94/replication to a file,replication-znodes-backup under hbase.rootdir, i.e., at <hbase.rootdir>/<myBackup>/replication-znodes-backup

 To restore a backup of replication znodes from myBackup/replication-znodes-backup
 $ $HBASE_HOME/bin/hbase org.apache.hadoop.hbase.replication.ReplicationZnodesBackup -restore -p myBackup
{code}

This could be part of a script to do the migration to 0.96.
                
> 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
>             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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