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Kafka, mail # dev - [jira] [Created] (KAFKA-686) 0.8 Kafka broker should give a better error message when running against 0.7 zookeeper


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[jira] [Created] (KAFKA-686) 0.8 Kafka broker should give a better error message when running against 0.7 zookeeper
"Jay Kreps 2013-01-08, 03:56
Jay Kreps created KAFKA-686:
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             Summary: 0.8 Kafka broker should give a better error message when running against 0.7 zookeeper
                 Key: KAFKA-686
                 URL: https://issues.apache.org/jira/browse/KAFKA-686
             Project: Kafka
          Issue Type: Bug
            Reporter: Jay Kreps
             Fix For: 0.8
People will not know that the zookeeper paths are not compatible. When you try to start the 0.8 broker pointed at a 0.7 zookeeper you get a NullPointerException. We should detect this and give a more sane error.

Error:
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$$anonfun$getReplicaAssignmentForTopics$2.apply(ZkUtils.scala:498)
        at kafka.utils.ZkUtils$$anonfun$getReplicaAssignmentForTopics$2.apply(ZkUtils.scala:494)
        at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:61)
        at scala.collection.immutable.List.foreach(List.scala:45)
        at kafka.utils.ZkUtils$.getReplicaAssignmentForTopics(ZkUtils.scala:494)
        at kafka.controller.KafkaController.initializeControllerContext(KafkaController.scala:446)
        at kafka.controller.KafkaController.onControllerFailover(KafkaController.scala:220)
        at kafka.controller.KafkaController$$anonfun$1.apply$mcV$sp(KafkaController.scala:85)
        at kafka.server.ZookeeperLeaderElector.elect(ZookeeperLeaderElector.scala:53)
        at kafka.server.ZookeeperLeaderElector.startup(ZookeeperLeaderElector.scala:43)
        at kafka.controller.KafkaController.startup(KafkaController.scala:381)
        at kafka.server.KafkaServer.startup(KafkaServer.scala:90)
        at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:34)
        at kafka.Kafka$.main(Kafka.scala:46)
        at kafka.Kafka.main(Kafka.scala)
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)
        ... 16 more

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