[jira] [Created] (SAMZA-905) Host Affinity - State restore doesn't work if the previous shutdown was uncontrolled

["Jake Maes (JIRA)" <ji...@apache.org>]

Jake Maes created SAMZA-905:
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             Summary: Host Affinity - State restore doesn't work if the previous shutdown was uncontrolled
                 Key: SAMZA-905
                 URL: https://issues.apache.org/jira/browse/SAMZA-905
             Project: Samza
          Issue Type: Bug
            Reporter: Jake Maes
            Assignee: Jake Maes


The host affinity feature writes an OFFSET file during shutdown which records the changelog offset for the persisted state store. Because the file is written at shutdown, it depends on a clean shutdown. Otherwise the file will not be there when the task restarts and the state will not be restored. 

This ticket is to add a continuous checkpointing feature so the OFFSET file is written at regular intervals and the most recent update can be used to restore state.

Note: this feature assumes all changelog entries are idempotent as warned in https://issues.apache.org/jira/secure/attachment/12696372/DESIGN-SAMZA-516-2.pdf  



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