[jira] [Created] (KAFKA-9205) Add an option to enforce rack-aware partition reassignment

["Vahid Hashemian (Jira)" <ji...@apache.org>]

Vahid Hashemian created KAFKA-9205:
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             Summary: Add an option to enforce rack-aware partition reassignment
                 Key: KAFKA-9205
                 URL: https://issues.apache.org/jira/browse/KAFKA-9205
             Project: Kafka
          Issue Type: Improvement
          Components: admin, tools
            Reporter: Vahid Hashemian


One regularly used healing operation on Kafka clusters is replica reassignments for topic partitions. For example, when there is a skew in inbound/outbound traffic of a broker replica reassignment can be used to move some leaders/followers from the broker; or if there is a skew in disk usage of brokers, replica reassignment can more some partitions to other brokers that have more disk space available.

In Kafka clusters that span across multiple data centers (or availability zones), high availability is a priority; in the sense that when a data center goes offline the cluster should be able to resume normal operation by guaranteeing partition replicas in all data centers.

This guarantee is currently the responsibility of the on-call engineer that performs the reassignment or the tool that automatically generates the reassignment plan for improving the cluster health (e.g. by considering the rack configuration value of each broker in the cluster). the former, is quite error-prone, and the latter, would lead to duplicate code in all such admin tools (which are not error free either).

It would be great for the built-in replica assignment API and tool provided by Kafka to support a rack aware verification option that would simply return an error when [some] brokers in any replica set share a common rack. 



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