[jira] [Created] (KAFKA-6031) Expose standby replicas endpoints in StreamsMetadata

["Stanislav Chizhov (JIRA)" <ji...@apache.org>]

Stanislav Chizhov created KAFKA-6031:
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             Summary: Expose standby replicas endpoints in StreamsMetadata
                 Key: KAFKA-6031
                 URL: https://issues.apache.org/jira/browse/KAFKA-6031
             Project: Kafka
          Issue Type: Improvement
          Components: streams
            Reporter: Stanislav Chizhov


Currently reads for a key are served by single replica, which has 2 drawbacks:
- if replica is down there is a down time in serving reads for keys it was responsible for until a standby replica takes over
- in case of semantic partitioning some replicas might become hot and there is no easy way to scale the read load

If standby replicas would have endpoints that are exposed in StreamsMetadata it would enable serving reads from several replicas, which would mitigate the above drawbacks. 
Due to the lag between replicas reading from multiple replicas simultaneously would have weaker (eventual) consistency comparing to reads from single replica. This however should be acceptable tradeoff in many cases.



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