Recipe: Fault tolerant communication layer using Zookeeper

                 Key: ZOOKEEPER-924
             Project: Zookeeper
          Issue Type: Task
          Components: recipes
         Environment: Any
            Reporter: kishore gopalakrishna

A typical use case in distributed system is " There are T tasks and P processes 
running but only T processes must be active always [ P > T ]  and remaining P-T 
processes acting as stand by and be ready to take up a Task with one or more 
active processes fail".  

Zookeeper provides an excellent service which can be used to co ordinate among 
P processes and using the mechanism of locking we can ensure that there is 
always T processes active.  Without a central co-ordinating service generally 
there will be 2T processes[ i.e atleast one back up for each process].  With 
Zookeeper we can decide P based on the failure rate.

The assumption here are
1. At any time we have P > T. P can be chosen appropriately based on failure 
2. The tasks are stateless. That is any process P_i that takes up a task T_j 
does not know the state of the process P_k which previously processed T_j.  
This is not entirely true and there are ways to over come this draw back on a 
case by case basis.

This was developed for a different project S4 which is also open sourced The communication layer and task management layer is completely 
independent of S4 and can be used in any application.

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