Recipe: Fault tolerant communication layer using Zookeeper
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Key: ZOOKEEPER-924
URL: https://issues.apache.org/jira/browse/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
rate.
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
http://s4.io/. The communication layer and task management layer is completely
independent of S4 and can be used in any application.
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