[jira] [Created] (KAFKA-5091) ReassignPartitionsCommand should protect against empty replica list assignment

["Ryan P (JIRA)" <ji...@apache.org>]

Ryan P created KAFKA-5091:
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             Summary: ReassignPartitionsCommand should protect against empty replica list assignment 
                 Key: KAFKA-5091
                 URL: https://issues.apache.org/jira/browse/KAFKA-5091
             Project: Kafka
          Issue Type: Improvement
          Components: tools
            Reporter: Ryan P


Currently it is possible to lower a topics replication factor to 0 through the use of the kafka-reassign-partitions command. 

i.e. 

cat increase-replication-factor.json
  {"version":1,
  "partitions":[{"topic":"foo","partition":0,"replicas":[]}]}

kafka-reassign-partitions --zookeeper localhost:2181 --reassignment-json-file increase-replication-factor.json --execute

Topic:test	PartitionCount:1	ReplicationFactor:0	Configs:
	Topic: foo	Partition: 0	Leader: -1	Replicas: 	Isr:

I for one can't think of a reason why this is something someone would do intentionally. That said I think it's worth validating that at least 1 replica remains within the replica list prior to executing the partition reassignment. 





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