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https://issues.apache.org/jira/browse/HBASE-11059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14010081#comment-14010081
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Jimmy Xiang commented on HBASE-11059:
-------------------------------------
The old assignment logic is still there for rolling upgrade. If the new logic
is turned on, we will store "states" to meta, and regionserver reports region
transitions to master via RPC instead of ZK. There are still room for
improvement, for example, report aggregation, skip some heart-beat, etc..
Client side logic is not changed very much for compatibility.
> ZK-less region assignment
> -------------------------
>
> Key: HBASE-11059
> URL: https://issues.apache.org/jira/browse/HBASE-11059
> Project: HBase
> Issue Type: Improvement
> Components: master, Region Assignment
> Reporter: Jimmy Xiang
> Assignee: Jimmy Xiang
> Attachments: hbase-11059.patch, zk-less_am.pdf
>
>
> It seems that most people don't like region assignment with ZK (HBASE-5487),
> which causes many uncertainties. This jira is to support ZK-less region
> assignment. We need to make sure this patch doesn't break backward
> compatibility/rolling upgrade.
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