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https://issues.apache.org/jira/browse/HBASE-11611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14649070#comment-14649070
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Lars Francke commented on HBASE-11611:
--------------------------------------

This patch deleted the file UpgradeTo96.java which is still referenced from the 
hbase shell script in the upgrade command. It is still documented in the book 
too. I'm not 100% sure but this might mean that upgrades from 0.94 don't work 
anymore?

> Clean up ZK-based region assignment
> -----------------------------------
>
>                 Key: HBASE-11611
>                 URL: https://issues.apache.org/jira/browse/HBASE-11611
>             Project: HBase
>          Issue Type: Improvement
>          Components: Region Assignment
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>             Fix For: 2.0.0
>
>         Attachments: hbase-11611.addendum, hbase-11611.patch, 
> hbase-11611_v1.patch, hbase-11611_v2.patch
>
>
> We can clean up the ZK-based region assignment code and use the ZK-less one 
> in the master branch, to make the code easier to understand and maintain.



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