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https://issues.apache.org/jira/browse/HBASE-2392?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell updated HBASE-2392:
----------------------------------

    Release Note: 
This version of HBase uses ZooKeeper 3.3.0. If you are running a separate ZK 
quorum ensemble, you should upgrade it. See the ZooKeeper release notes for 
3.3.0: http://hadoop.apache.org/zookeeper/docs/r3.3.0/releasenotes.html


> upgrade to ZooKeeper 3.3.0
> --------------------------
>
>                 Key: HBASE-2392
>                 URL: https://issues.apache.org/jira/browse/HBASE-2392
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Minor
>             Fix For: 0.20.4, 0.21.0
>
>         Attachments: HBASE-2392.patch, HBASE-2392.patch
>
>
> See http://hadoop.apache.org/zookeeper/docs/r3.3.0/releasenotes.html
> Key features of the 3.3.0 release:
> * observers - non-voting members of the ensemble, scale reads  
> http://bit.ly/9wPnpq
> * distributed queue recipe implementation (c/java)
> * additional 4letterword/jmx features to support operations
> Changes in contrib:
> * zookeeper-tree: export/import znode namespace
> * zooinspector: gui browser for znode namespace
> * bookkeeper client rewrite, use of netty
> This change can't be done on the 0.20 branch. From the release notes:
> {quote}
> Note: a new feature was added to the version 3.3 client which breaks backward 
> compatibility, at the wire protocol level, between version 3.3 clients and 
> prior versions of the server (server versions prior to 3.3).
> {quote}

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