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https://issues.apache.org/jira/browse/SAMZA-424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14166553#comment-14166553
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Martin Kleppmann commented on SAMZA-424:
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bq. So, given that I think we should not do logged caches, and that shared 
caches should be addressed as part of SAMZA-40, I can't find a really 
compelling reason to bake this into the framework either. We can survive with 
app-level caching for now.

+1

> Add a Cache state API to the Samza container
> --------------------------------------------
>
>                 Key: SAMZA-424
>                 URL: https://issues.apache.org/jira/browse/SAMZA-424
>             Project: Samza
>          Issue Type: New Feature
>          Components: container
>            Reporter: Chinmay Soman
>            Assignee: Chinmay Soman
>         Attachments: SAMZA-424-Cache-API_0.pdf, SAMZA-424-Cache-API_1.md, 
> SAMZA-424-Cache-API_2.md, SAMZA-424-Cache-API_2.pdf, samza-424-cache-api_1.pdf
>
>
> There are cases when the user code needs access to a 'cache' which can be 
> used to store custom data. This cache is different from the KeyValue store in 
> the following ways:
> * At the very least Needs to support LRU (Least Recently Used) and TTL (Time 
> To Live) eviction strategies
> * May not support all() and range() operations (since this wreaks havoc with 
> the eviction operation)
> * Needs to exist at a per task or a per container level.



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