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https://issues.apache.org/jira/browse/KAFKA-4577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15818922#comment-15818922
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Scott Reynolds commented on KAFKA-4577:
---------------------------------------
Nothing interesting was happening, obviously ISR change was happening but it
wasn't triggered by a human.
Had this happen again yesterday.
It is unclear to me what is set to null and how it got to that state for this:
{code:java}
controller.deleteTopicManager.partitionsToBeDeleted.isEmpty
{code}
> NPE in ControllerChannelManager.scala::addUpdateMetadataRequestForBrokers
> --------------------------------------------------------------------------
>
> Key: KAFKA-4577
> URL: https://issues.apache.org/jira/browse/KAFKA-4577
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.10.1.0
> Reporter: Scott Reynolds
>
> Seems as if either deleteTopicManager or deleteTopicManager.
> partitionsToBeDeleted wasn't set ?
> {code}
> java.lang.NullPointerException
> at
> kafka.controller.ControllerBrokerRequestBatch.addUpdateMetadataRequestForBrokers
> (ControllerChannelManager.scala:331)
> at kafka.controller.KafkaController.sendUpdateMetadataRequest
> (KafkaController.scala:1023)
> at
> kafka.controller.IsrChangeNotificationListener.kafka$controller$IsrChangeNotificationListener$$processUpdateNotifications
> (KafkaController.scala:1371)
> at
> kafka.controller.IsrChangeNotificationListener$$anonfun$handleChildChange$1.apply$mcV$sp
> (KafkaController.scala:1358)
> at
> kafka.controller.IsrChangeNotificationListener$$anonfun$handleChildChange$1.apply
> (KafkaController.scala:1351)
> at
> kafka.controller.IsrChangeNotificationListener$$anonfun$handleChildChange$1.apply
> (KafkaController.scala:1351)
> at kafka.utils.CoreUtils$.inLock (CoreUtils.scala:234)
> at kafka.controller.IsrChangeNotificationListener.handleChildChange
> (KafkaController.scala:1351)
> at org.I0Itec.zkclient.ZkClient$10.run (ZkClient.java:843)
> at org.I0Itec.zkclient.ZkEventThread.run (ZkEventThread.java:71)
> {code}
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