lakshmi-manasa-g opened a new pull request, #1625:
URL: https://github.com/apache/samza/pull/1625

   Symptom: rolling back to versions which dont accept 4 parts in checkpoint 
serde can throw NPE exceptions.
   
   Cause:
   as part of elasticity, #1608 introduced keyBucket into checkpoint serde.
   
   fix: remove keyBucket from checkpoint serde - aka do not add it when 
serializing checkpoint.
   
   tests: existing pass.
   
   usage/upgrade: N/A
   
   backwards compatible: yes. 
   Though checkpoints written after #1608 and before this PR will have 4 part 
SSP in checkpoint, serde, they can still be read by code in this PR and vice 
versa. 
   elasticity will not work completely once this pr is merged. 


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