[jira] [Updated] (KAFKA-10079) Improve thread-level stickiness of stateful tasks

["Sophie Blee-Goldman (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-10079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sophie Blee-Goldman updated KAFKA-10079:
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    Summary: Improve thread-level stickiness of stateful tasks  (was: Support high availability for in-memory stores)

> Improve thread-level stickiness of stateful tasks
> -------------------------------------------------
>
>                 Key: KAFKA-10079
>                 URL: https://issues.apache.org/jira/browse/KAFKA-10079
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: Sophie Blee-Goldman
>            Assignee: Sophie Blee-Goldman
>            Priority: Major
>             Fix For: 2.6.0
>
>
> Now that KAFKA-9501 is fixed, we should make sure that KIP-441 will work with in-memory stores.
> Our current technique for reporting offsets, locking all task directories and searching for offsets in the written checkpoint file, only works for persistent stores. We should make sure to compute offset sums for in-memory stores as well, for which we don't write a checkpoint file.
> We should also improve the thread-level stickiness of stateful tasks, since we don't handoff stores between threads and thus any in-memory state will be wiped out if transferred between threads.



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