Hi,
First of all, I am new to Kafka and more of a user than a developer. I will
try to clarify things as much as possible though.
We are using Kafka as a message system for our apps and works nicely in our
SaaS cluster.
I am trying to make the apps also work on a single node for demo purposes.
I set up Zookeeper, Kafka and our apps on a node and things were ok until
rebooting the node. After that I see the following messages in Kafka log:
[2014-10-22 16:37:22,206] INFO [Controller 0]: Controller starting up
(kafka.controller.KafkaController)
[2014-10-22 16:37:22,419] INFO [Controller 0]: Controller startup complete
(kafka.controller.KafkaController)
[2014-10-22 16:37:22,554] INFO conflict in /brokers/ids/0 data:
{"jmx_port":-1,"timestamp":"1413995842465","host":"ip-10-91-142-54.eu-west-1.compute.internal","version":1,"port":9092}
stored data:
{"jmx_port":-1,"timestamp":"1413994171579","host":"ip-10-91-142-54.eu-west-1.compute.internal","version":1,"port":9092}
(kafka.utils.ZkUtils$)
[2014-10-22 16:37:22,736] INFO I wrote this conflicted ephemeral node
[{"jmx_port":-1,"timestamp":"1413995842465","host":"ip-10-91-142-54.eu-west-1.compute.internal","version":1,"port":9092}]
at /brokers/ids/0 a while back in a different session, hence I will backoff
for this node to be deleted by Zookeeper and retry (kafka.utils.ZkUtils$)
[2014-10-22 16:37:25,010] ERROR Error handling event ZkEvent[Data of
/controller changed sent to
kafka.server.ZookeeperLeaderElector$LeaderChangeListener@a6af882]
(org.I0Itec.zkclient.ZkEventThread)
java.lang.IllegalStateException: Kafka scheduler has not been started
at
kafka.utils.KafkaScheduler.ensureStarted(KafkaScheduler.scala:114)
at kafka.utils.KafkaScheduler.shutdown(KafkaScheduler.scala:86)
at
kafka.controller.KafkaController.onControllerResignation(KafkaController.scala:350)
at
kafka.controller.KafkaController$$anonfun$2.apply$mcV$sp(KafkaController.scala:162)
at
kafka.server.ZookeeperLeaderElector$LeaderChangeListener$$anonfun$handleDataDeleted$1.apply$mcZ$sp(ZookeeperLeaderElector.scala:138)
at
kafka.server.ZookeeperLeaderElector$LeaderChangeListener$$anonfun$handleDataDeleted$1.apply(ZookeeperLeaderElector.scala:134)
at
kafka.server.ZookeeperLeaderElector$LeaderChangeListener$$anonfun$handleDataDeleted$1.apply(ZookeeperLeaderElector.scala:134)
at kafka.utils.Utils$.inLock(Utils.scala:535)
at
kafka.server.ZookeeperLeaderElector$LeaderChangeListener.handleDataDeleted(ZookeeperLeaderElector.scala:134)
at org.I0Itec.zkclient.ZkClient$6.run(ZkClient.java:549)
at org.I0Itec.zkclient.ZkEventThread.run(ZkEventThread.java:71)
[2014-10-22 16:37:28,757] INFO Registered broker 0 at path /brokers/ids/0
with address ip-10-91-142-54.eu-west-1.compute.internal:9092.
(kafka.utils.ZkUtils$)
[2014-10-22 16:37:28,849] INFO [Kafka Server 0], started
(kafka.server.KafkaServer)
[2014-10-22 16:38:56,718] INFO Closing socket connection to /127.0.0.1.
(kafka.network.Processor)
[2014-10-22 16:38:56,850] INFO Closing socket connection to /127.0.0.1.
(kafka.network.Processor)
[2014-10-22 16:38:56,985] INFO Closing socket connection to /127.0.0.1.
(kafka.network.Processor)
The last log line repeats forever and is correlated with errors on the app
side.
Restarting Kafka fixes the errors.
I am using Kafka 0.8.2 from github to avoid
https://issues.apache.org/jira/browse/KAFKA-1451.
Does anyone have any idea why this happens and how it can be fixed?
Thanks,
Ciprian
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