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https://issues.apache.org/jira/browse/KAFKA-5091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15991354#comment-15991354
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ASF GitHub Bot commented on KAFKA-5091:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/2904
> 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
> Assignee: huxi
> Fix For: 0.11.0.0
>
>
> 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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