[jira] [Created] (KAFKA-6061) "ERROR Error while electing or becoming leader on broker 13 (kafka.server.ZookeeperLeaderElector) kafka.common.KafkaException: Can't parse json string: null" should print out information on which zookeeper path contains the null element

[Koelli Mungee (JIRA)]

Koelli Mungee created KAFKA-6061:
------------------------------------

             Summary: "ERROR Error while electing or becoming leader on broker 
13 (kafka.server.ZookeeperLeaderElector)  kafka.common.KafkaException: Can't 
parse json string: null" should print out information on which zookeeper path 
contains the null element
                 Key: KAFKA-6061
                 URL: https://issues.apache.org/jira/browse/KAFKA-6061
             Project: Kafka
          Issue Type: Bug
          Components: zkclient
    Affects Versions: 0.10.2.1
            Reporter: Koelli Mungee


The controller enters a loop with the error as 


{code:java}
[2017-10-12 21:40:09,532] ERROR Error while electing or becoming leader on 
broker 13 (kafka.server.ZookeeperLeaderElector) 
kafka.common.KafkaException: Can't parse json string: null 
at kafka.utils.Json$.liftedTree1$1(Json.scala:40) 
at kafka.utils.Json$.parseFull(Json.scala:36) 
at 
kafka.utils.ZkUtils$$anonfun$getReplicaAssignmentForTopics$1.apply(ZkUtils.scala:684)
 
at 
kafka.utils.ZkUtils$$anonfun$getReplicaAssignmentForTopics$1.apply(ZkUtils.scala:680)
 
at 
scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59) 
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48) 
at kafka.utils.ZkUtils.getReplicaAssignmentForTopics(ZkUtils.scala:680) 
at 
kafka.controller.KafkaController.initializeControllerContext(KafkaController.scala:736)
 
at 
kafka.controller.KafkaController.onControllerFailover(KafkaController.scala:334)
 
at 
kafka.controller.KafkaController$$anonfun$1.apply$mcV$sp(KafkaController.scala:167)
 
at kafka.server.ZookeeperLeaderElector.elect(ZookeeperLeaderElector.scala:84) 
{code}

A kafka-topics --describe can be issued to figure out which topic partition has 
the problem. However, this would be easier for the user if the actual zk path 
with the null or malformed entry would be printed out.



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