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From Gwen Shapira <g...@confluent.io>
Subject Re: Kafka 0.9.0.1 failing on new leader election
Date Mon, 01 Aug 2016 22:30:48 GMT
This looks correct. Sorry, not sure what else it could be.

On Sat, Jul 30, 2016 at 4:24 AM, Sean Morris (semorris)
<semorris@cisco.com> wrote:
> Kafka 0.9.0.1
> Zookeeper 3.4.6
> Zkclient 0.7
>
> I have verified I only have one zkclient.jar in my class path.
>
> Thanks,
> Sean
>
>
>
>
> On 7/29/16, 9:35 PM, "Gwen Shapira" <gwen@confluent.io> wrote:
>
>>you know, I ran into those null pointer exceptions when I accidentally
>>tested Kafka with mismatching version of zkclient.
>>
>>Can you share the versions of both? And make sure you have only one
>>zkclient on your classpath?
>>
>>On Tue, Jul 26, 2016 at 6:40 AM, Sean Morris (semorris)
>><semorris@cisco.com> wrote:
>>> I have a setup with 2 brokers and it is going through leader re-election but
seems to fail to complete. The behavior I start to see is that some published succeed but
others will fail with NotLeader exceptions like this
>>>
>>>
>>> java.util.concurrent.ExecutionException: org.apache.kafka.common.errors.NotLeaderForPartitionException:
This server is not the leader for that topic-partition.
>>>
>>>         at org.apache.kafka.clients.producer.internals.FutureRecordMetadata.valueOrError(FutureRecordMetadata.java:56)
>>>
>>>         at org.apache.kafka.clients.producer.internals.FutureRecordMetadata.get(FutureRecordMetadata.java:43)
>>>
>>>         at org.apache.kafka.clients.producer.internals.FutureRecordMetadata.get(FutureRecordMetadata.java:25)
>>>
>>>
>>> My Kafka and zookeeper log file has errors like this
>>>
>>>
>>> [2016-07-26 02:01:12,842] ERROR [kafka.controller.ControllerBrokerRequestBatch]
Haven't been able to send metadata update requests, current state of the map is Map(2 ->
Map(eox-1 -> (LeaderAndIsrInfo:(Leader:2,ISR:2,1,LeaderEpoch:46,ControllerEpoch:34),ReplicationFactor:2),AllReplicas:2,1),
notify-eportal-1 -> (LeaderAndIsrInfo:(Leader:2,ISR:2,1,LeaderEpoch:51,ControllerEpoch:34),ReplicationFactor:2),AllReplicas:2,1),
psirts-1 -> (LeaderAndIsrInfo:(Leader:2,ISR:2,1,LeaderEpoch:51,ControllerEpoch:34),ReplicationFactor:2),AllReplicas:2,1),
notify-pushNotif-low-1 -> (LeaderAndIsrInfo:(Leader:2,ISR:2,1,LeaderEpoch:51,ControllerEpoch:34),ReplicationFactor:2),AllReplicas:2,1)),
1 -> Map(eox-1 -> (LeaderAndIsrInfo:(Leader:2,ISR:2,1,LeaderEpoch:46,ControllerEpoch:34),ReplicationFactor:2),AllReplicas:2,1),
notify-eportal-1 -> (LeaderAndIsrInfo:(Leader:2,ISR:2,1,LeaderEpoch:51,ControllerEpoch:34),ReplicationFactor:2),AllReplicas:2,1),
psirts-1 -> (LeaderAndIsrInfo:(Leader:2,ISR:2,1,LeaderEpoch:51,ControllerEpoch:34),ReplicationFactor:2),AllReplicas:2,1),
notify-pushNotif-low-1 -> (LeaderAndIsrInfo:(Leader:2,ISR:2,1,LeaderEpoch:51,ControllerEpoch:34),ReplicationFactor:2),AllReplicas:2,1)))
>>>
>>> [2016-07-26 02:01:12,845] ERROR [kafka.controller.KafkaController] [Controller
1]: Forcing the controller to resign
>>>
>>>
>>> Which is then followed by a null pointer exception
>>>
>>>
>>> [2016-07-26 02:01:13,021] ERROR [org.I0Itec.zkclient.ZkEventThread] Error handling
event ZkEvent[Children of /isr_change_notification changed sent to kafka.controller.IsrChangeNotificationListener@55ca3750]
>>>
>>> java.lang.IllegalStateException: java.lang.NullPointerException
>>>
>>>         at kafka.controller.ControllerBrokerRequestBatch.sendRequestsToBrokers(ControllerChannelManager.scala:434)
>>>
>>>         at kafka.controller.KafkaController.sendUpdateMetadataRequest(KafkaController.scala:1029)
>>>
>>>         at kafka.controller.IsrChangeNotificationListener.kafka$controller$IsrChangeNotificationListener$$processUpdateNotifications(KafkaController.scala:1372)
>>>
>>>         at kafka.controller.IsrChangeNotificationListener$$anonfun$handleChildChange$1.apply$mcV$sp(KafkaController.scala:1359)
>>>
>>>         at kafka.controller.IsrChangeNotificationListener$$anonfun$handleChildChange$1.apply(KafkaController.scala:1352)
>>>
>>>         at kafka.controller.IsrChangeNotificationListener$$anonfun$handleChildChange$1.apply(KafkaController.scala:1352)
>>>
>>>         at kafka.utils.CoreUtils$.inLock(CoreUtils.scala:262)
>>>
>>>         at kafka.controller.IsrChangeNotificationListener.handleChildChange(KafkaController.scala:1352)
>>>
>>>         at org.I0Itec.zkclient.ZkClient$10.run(ZkClient.java:842)
>>>
>>>         at org.I0Itec.zkclient.ZkEventThread.run(ZkEventThread.java:71)
>>>
>>> Caused by: java.lang.NullPointerException
>>>
>>>         at kafka.controller.KafkaController.sendRequest(KafkaController.scala:699)
>>>
>>>         at kafka.controller.ControllerBrokerRequestBatch$$anonfun$sendRequestsToBrokers$2.apply(ControllerChannelManager.scala:403)
>>>
>>>         at kafka.controller.ControllerBrokerRequestBatch$$anonfun$sendRequestsToBrokers$2.apply(ControllerChannelManager.scala:369)
>>>
>>>         at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:99)
>>>
>>>         at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:99)
>>>
>>>         at scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:230)
>>>
>>>         at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:40)
>>>
>>>         at scala.collection.mutable.HashMap.foreach(HashMap.scala:99)
>>>
>>>         at kafka.controller.ControllerBrokerRequestBatch.sendRequestsToBrokers(ControllerChannelManager.scala:369)
>>>
>>>         ... 9 more
>>>
>>>
>>> I eventually restarted zookeeper and my brokers. This has happened twice in the
last week. Any ideas?
>>>
>>>
>>> Thanks,
>>>
>>> Sean
>>>

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