[jira] [Created] (KAFKA-9094) Validate the replicas for partition reassignments triggered through the /admin/reassign_partitions zNode

["Stanislav Kozlovski (Jira)" <ji...@apache.org>]

Stanislav Kozlovski created KAFKA-9094:
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             Summary: Validate the replicas for partition reassignments triggered through the /admin/reassign_partitions zNode
                 Key: KAFKA-9094
                 URL: https://issues.apache.org/jira/browse/KAFKA-9094
             Project: Kafka
          Issue Type: Improvement
            Reporter: Stanislav Kozlovski
            Assignee: Stanislav Kozlovski


As was mentioned by [~jsancio] in [https://github.com/apache/kafka/pull/7574#discussion_r337621762] , it would make sense to apply the same replica validation we apply to the KIP-455 reassignments API.

Namely, validate that the replicas:
* are not empty (e.g [])
* are not negative negative (e.g [1,2,-1])
* are not brokers that are not part of the cluster or otherwise unhealthy (e.g not in /brokers zNode)

The last liveness validation is subject to comments. We are re-evaluating whether we want to enforce it for the API



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