[jira] [Created] (KAFKA-1724) Errors after reboot in single node setup

["Ciprian Hacman (JIRA)" <ji...@apache.org>]

Ciprian Hacman created KAFKA-1724:
-------------------------------------

             Summary: Errors after reboot in single node setup
                 Key: KAFKA-1724
                 URL: https://issues.apache.org/jira/browse/KAFKA-1724
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 0.8.2
            Reporter: Ciprian Hacman


In a single node setup, after reboot, Kafka logs show the following:
{code}
[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)
{code}
The last log line repeats forever and is correlated with errors on the app side.
Restarting Kafka fixes the errors.

Steps to reproduce (with help from the mailing list):
# start zookeeper
# start kafka-broker
# create topic or start a producer writing to a topic
# stop zookeeper
# stop kafka-broker( kafka broker shutdown goes into  WARN Session
0x14938d9dc010001 for server null, unexpected error, closing socket connection and attempting reconnect (org.apache.zookeeper.ClientCnxn) java.net.ConnectException: Connection refused)
# kill -9 kafka-broker
# restart zookeeper and than kafka-broker leads into the the error above




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