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1) This queue interface recipe implements the queue recipe
mentioned in ../../../docs/recipes.[html,pdf].
A more detailed explanation is at http://www.cloudera.com/blog/2009/05/28/building-a-distributed-concurrent-queue-with-apache-zookeeper/

2) This recipe does not handle KeeperException.ConnectionLossException or ZCONNECTIONLOSS. It will only work correctly once ZOOKEEPER-22 https://issues.apache.org/jira/browse/ZOOKEEPER-22 is resolved.

3) To compile the queue java recipe you can just run ant jar from 
this directory. 
Please report any bugs on the jira 

http://issues.apache.org/jira/browse/ZOOKEEPER