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https://issues.apache.org/jira/browse/HBASE-16550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16499620#comment-16499620
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Duo Zhang commented on HBASE-16550:
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So the main problem here is zk-less assignment? Then I think we could document
that before upgrading to 2.x, you need to enable zk-less assignment first.
IIRC, this could be done by a two pass rolling upgrade?
> Procedure v2 - Add AM compatibility for 2.x Master and 1.x RSs; i.e. support
> Rolling Upgrade from hbase-1 to -2.
> ----------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-16550
> URL: https://issues.apache.org/jira/browse/HBASE-16550
> Project: HBase
> Issue Type: Sub-task
> Components: proc-v2, Region Assignment
> Affects Versions: 2.0.0
> Reporter: Matteo Bertozzi
> Priority: Blocker
>
> Core AM HBASE-14614 relies on the RS to be using zkless assignment. Add
> support for the old a plain non zkless AM
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