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https://issues.apache.org/jira/browse/KAFKA-3184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17097581#comment-17097581
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Matthias J. Sax commented on KAFKA-3184:
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Works for me. But we can also discuss on the PR?

> Add Checkpoint for In-memory State Store
> ----------------------------------------
>
>                 Key: KAFKA-3184
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3184
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Guozhang Wang
>            Assignee: Nikolay Izhikov
>            Priority: Major
>              Labels: user-experience
>
> Currently Kafka Streams does not make a checkpoint of the persistent state 
> store upon committing, which would be expensive since it is "stopping the 
> world" and write on disks: for example, RocksDB would require you to copy the 
> file directory to make a copy naively. 
> However, for in-memory stores checkpointing maybe doable in an asynchronous 
> manner hence it can be done quickly. And the benefit of having intermediate 
> checkpoint is to avoid restoring from scratch if standby tasks are not 
> present.



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