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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