[jira] [Created] (KAFKA-19726) Throw an exception if client tries to override topic replication factor with a value that it < min.insync.replicas

[Genseric Ghiro (Jira)]

Genseric Ghiro created KAFKA-19726:
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             Summary: Throw an exception if client tries to override topic 
replication factor with a value that it < min.insync.replicas
                 Key: KAFKA-19726
                 URL: https://issues.apache.org/jira/browse/KAFKA-19726
             Project: Kafka
          Issue Type: Improvement
          Components: core
            Reporter: Genseric Ghiro
            Assignee: Genseric Ghiro


The goal of this ticket is to start a KIP with the following proposed changes:

Currently, the broker overrides settings upon a client initial request. I.e. 
there's some logic to consolidate/merge settings from the broker and from the 
client. During that step, it should be doable to throw an exception if there's 
an invalid configuration. This ticket is specifically for throwing an exception 
if the client overrides `replication.factor` with a value that is less than 
`min.insync.replicas` specified by the broker. This check should happen where 
the “merging” logic happens, on the broker side.



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