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Compatibility, Deprecation, and Migration Plan

 The changes in this SEP currently only targets the YARN deployment model and is not intended for Standalone.

Rejected Alternatives

• Use CoordinatorStream as the heart beat channel. 
  • Pros: use async pub-sub model to avoid timeouts in sync methods, easy to scale to a large number of containers
  • Cons: protocol is more complex to implement, message/token delivery latency maybe uncertain and make the heart beat process much longer
  Implement monitors in the samza-rest to monitor the containers externally and verify if they should be running
  • .