zookeeper-tree utility for export, import and incremental updates

                 Key: ZOOKEEPER-496
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-496
             Project: Zookeeper
          Issue Type: New Feature
          Components: contrib
    Affects Versions: 3.1.1
         Environment: RHEL 4.6, libxml2
            Reporter: Anirban Roy

I propose and plan to develop a ZK-tree utility for managing cluster data (ZK 
tree) quickly and efficiently. The utility operates on free-form ZK-tree and 
hence can be used for any cluster managed by Zookeeper. Here are the basic 
functionalities -

Export ZK-tree: The whole ZK-tree is exported into a XML file. This helps in 
capturing a current snapshot of the data for backup/analysis. In addition, the 
data can be dumped as tree-like text format which is easily readable.

Import ZK-tree: The ZK-tree can be imported from XML into ZK cluster. This 
helps in priming the new ZK cluster with static configuration. The import can 
be non-intrusive by making only the additions in the existing data.

Diff ZK-tree: Creates a diff between live ZK data vs data saved in XML file. 
Diff can ignore some ZK-tree branches (possibly dynamic data) on reading the 
flag from XML file.

Update ZK-tree: Make the incremental changes into the live ZK-tree from saved 
XML, essentially after running the diff.


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