Last hint for open ledger

                 Key: ZOOKEEPER-462
             Project: Zookeeper
          Issue Type: New Feature
          Components: contrib-bookkeeper
            Reporter: Flavio Paiva Junqueira

In some use cases of BookKeeper, it is useful to be able to read from a ledger 
before closing the ledger. To enable such a feature, the writer has to be able 
to communicate to a reader how many entries it has been able to write 
successfully. The main idea of this jira is to continuously update a znode with 
the number of successful writes, and a reader can, for example, watch the node 
for changes.

 I was thinking of having a configuration parameter to state how often a writer 
should update the hint on ZooKeeper (e.g., every 1000 requests, every 10,000 
requests). Clearly updating more often increases the overhead of writing to 
ZooKeeper, although the impact on the performance of writes to BookKeeper 
should be minimal given that we make an asynchronous call to update the hint.

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