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https://issues.apache.org/jira/browse/HBASE-2392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851300#action_12851300
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Andrew Purtell commented on HBASE-2392:
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Sorry, didn't catch the dupe.
bq. Is zk 3.3.0 not in a maven repo now?
I updated zookeeper.version to 3.3.0 in the toplevel pom and Maven complained
about not being able to find it.
bq. Why you thinking of not doing this on branch? Real installs will be pissed
off about required upgrade of zk?
Yes. But if we've already frustrated rolling restarts, then do people care?
Same patch trivially applies to branch.
> 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: 0.21.0
>
> Attachments: 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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