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https://issues.apache.org/jira/browse/HBASE-9141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13737611#comment-13737611
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Himanshu Vashishtha commented on HBASE-9141:
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Thanks for the questions Rajesh.
bq. ->while restoring don't we need to convert to PB after migrating to 0.96.0
Yes. Somehow, I missed that we need to call explicitly to pre-append the pb
magic. I would say we should add the pb magic in
RecoverableZookeeper.appendMetaData(byte[] data), which is called for every
znode we create.
bq. second question.
Not sure I follow your question correctly. The idea is to run this tool
*before* the cluster is started. It is part of the migration. So, replication
znodes will be there before replaying/splitting starts. Does this answer help?
Stack: Do we have the same format for enable/disable table znode (other than
pb)? That is, the znode name is same b/w 0.92/0.94 vs 0.96. I am not sure about
this, but I did see some extra znodes while testing this tool against 0.94
(table92, enabledisable, etc). If we want to save them, could it be done in a
follow up jira? Please let me know if you think otherwise.
Let me test the patch on a real 0.94, replication enabled cluster. I will
upload the patch after testing.
> 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, HBase-9141-v1.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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