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

["Navina Ramesh (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SAMZA-905?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Navina Ramesh updated SAMZA-905:
--------------------------------
    Fix Version/s: 0.10.1

> 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
>             Fix For: 0.10.1
>
>
> 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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