[jira] [Assigned] (KAFKA-20999) Add rack-aware standby task assignment

["Matthias J. Sax (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-20999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias J. Sax reassigned KAFKA-20999:
---------------------------------------

    Assignee: Ziyun Fu

> Add rack-aware standby task assignment
> --------------------------------------
>
>                 Key: KAFKA-20999
>                 URL: https://issues.apache.org/jira/browse/KAFKA-20999
>             Project: Kafka
>          Issue Type: Sub-task
>          Components: group-coordinator, streams
>            Reporter: Matthias J. Sax
>            Assignee: Ziyun Fu
>            Priority: Major
>
> In the "classic" protocol, there is "sticky" and "ha_assignor" options, and KIP-1071 defines both assignor options, too. The "sticky" assignor is already available, while the "ha_assignor" is missing.
> However, KIP-1071 introduced a different architecture and the class HA-assignor features are not delivered in the same way, instead, "warmup tasks" are injected via a new refiner step, and the HA-assignor does not need to concern itself with it.
> The HA-assignor also computes a different assignment compare to "sticky", which we are tracking via it's own sub-task.
> This ticket is about adding rack-aware standby task assignment, to make KIP-1017 feature complete with the classic HA-assignor (note, that the classic sticky assignor does not implement rack-aware standby task assignment). To this end, we want to not only close this "ha" feature gap, but implement rack-aware standby task assignment for both "sticky" and "balance" assignor.



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