Kafka
  1. Kafka
  2. KAFKA-799

Infinite loop trying to start a broker

    Details

    • Type: Bug Bug
    • Status: Resolved
    • Priority: Blocker Blocker
    • Resolution: Not A Problem
    • Affects Version/s: 0.8.0
    • Fix Version/s: None
    • Component/s: controller
    • Labels:
    • Environment:
      Mac OS X 10.7.5

      Description

      I followed the quickstart instructions
      https://cwiki.apache.org/confluence/display/KAFKA/Kafka+0.8+Quick+Start

      It caused an infinite loop while trying to start a broker.
      [2013-03-08 16:55:19,287] ERROR Error while electing or becoming leader on broker 1 (kafka.server.ZookeeperLeaderElector)
      kafka.common.KafkaException: Can't parse json string: null
      at kafka.utils.Json$.liftedTree1$1(Json.scala:20)
      at kafka.utils.Json$.parseFull(Json.scala:16)
      at kafka.utils.ZkUtils$$anonfun$getReplicaAssignmentForTopics$1.apply(ZkUtils.scala:484)
      at kafka.utils.ZkUtils$$anonfun$getReplicaAssignmentForTopics$1.apply(ZkUtils.scala:480)
      at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:61)
      at scala.collection.immutable.List.foreach(List.scala:45)
      at kafka.utils.ZkUtils$.getReplicaAssignmentForTopics(ZkUtils.scala:480)
      at kafka.controller.KafkaController.initializeControllerContext(KafkaController.scala:451)
      at kafka.controller.KafkaController.onControllerFailover(KafkaController.scala:225)
      at kafka.controller.KafkaController$$anonfun$1.apply$mcV$sp(KafkaController.scala:87)
      at kafka.server.ZookeeperLeaderElector.elect(ZookeeperLeaderElector.scala:53)
      at kafka.server.ZookeeperLeaderElector$LeaderChangeListener.handleDataDeleted(ZookeeperLeaderElector.scala:106)
      at org.I0Itec.zkclient.ZkClient$6.run(ZkClient.java:549)
      at org.I0Itec.zkclient.ZkEventThread.run(ZkEventThread.java:71)
      Caused by: java.lang.NullPointerException
      at scala.util.parsing.combinator.lexical.Scanners$Scanner.<init>(Scanners.scala:52)
      at scala.util.parsing.json.JSON$.parseRaw(JSON.scala:71)
      at scala.util.parsing.json.JSON$.parseFull(JSON.scala:85)
      at kafka.utils.Json$.liftedTree1$1(Json.scala:17)
      ... 13 more

      I tracked the issue to unhandled Java null string in these 2 methods in ZkUtils: getReplicaAssignmentForTopics, getPartitionAssignmentForTopics.

      I am submitting a patch with the fixes. Now quickstart works fine for me.

        Activity

        No work has yet been logged on this issue.

          People

          • Assignee:
            Swapnil Ghike
            Reporter:
            Bob
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            Watchers:
            4 Start watching this issue

            Dates

            • Created:
              Updated:
              Resolved:

              Development