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https://issues.apache.org/jira/browse/KAFKA-16179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17809591#comment-17809591
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Jason Gustafson commented on KAFKA-16179:
-----------------------------------------
It is probably not a blocker. It looks like it is a race condition on
controller shutdown. The impact is probably a failed connection on a shutting
down controller.
> NPE handle ApiVersions during controller failover
> -------------------------------------------------
>
> Key: KAFKA-16179
> URL: https://issues.apache.org/jira/browse/KAFKA-16179
> Project: Kafka
> Issue Type: Bug
> Reporter: Jason Gustafson
> Priority: Major
>
> {code:java}
> java.lang.NullPointerException: Cannot invoke
> "org.apache.kafka.metadata.publisher.FeaturesPublisher.features()" because
> the return value of "kafka.server.ControllerServer.featuresPublisher()" is
> null
> at
> kafka.server.ControllerServer.$anonfun$startup$12(ControllerServer.scala:242)
> at
> kafka.server.SimpleApiVersionManager.features(ApiVersionManager.scala:122)
> at
> kafka.server.SimpleApiVersionManager.apiVersionResponse(ApiVersionManager.scala:111)
> at
> kafka.server.ControllerApis.$anonfun$handleApiVersionsRequest$3(ControllerApis.scala:566)
> at
> kafka.server.ControllerApis.$anonfun$handleApiVersionsRequest$3$adapted(ControllerApis.scala:566
> {code}
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