[KAFKA-1271] controller logs exceptions during ZK session expiration

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.1
• Fix Version/s: 0.8.1
• Assignee: Jun Rao
• Reporter: Jun Rao
• Created: 19/Feb/14 02:31
• Updated: 03/Apr/14 16:27
• Resolved: 20/Feb/14 17:52

Description

Saw the following issues when there is ZK session expiration in the controller.

1.
ERROR Error handling event ZkEvent[Children of
/admin/delete_topics changed sent to
kafka.controller.PartitionStateMachine$DeleteTopicsListener@39abdac9]
(org.I0Itec.zkclient.ZkEventThread)
java.lang.NullPointerException
at
scala.collection.JavaConversions$JListWrapper.iterator(JavaConversions.scala:524)
at scala.collection.IterableLike$class.foreach(IterableLike.scala:79)
at
scala.collection.JavaConversions$JListWrapper.foreach(JavaConversions.scala:521)
at
scala.collection.TraversableOnce$class.foldLeft(TraversableOnce.scala:176)
at
scala.collection.JavaConversions$JListWrapper.foldLeft(JavaConversions.scala:521)
at
scala.collection.TraversableOnce$class.$div$colon(TraversableOnce.scala:139)
at
scala.collection.JavaConversions$JListWrapper.$div$colon(JavaConversions.scala:521)
at scala.collection.generic.Addable$class.$plus$plus(Addable.scala:54)
at scala.collection.immutable.Set$EmptySet$.$plus$plus(Set.scala:47)
at scala.collection.TraversableOnce$class.toSet(TraversableOnce.scala:436)
at
scala.collection.JavaConversions$JListWrapper.toSet(JavaConversions.scala:521)
at
kafka.controller.PartitionStateMachine$DeleteTopicsListener$$anonfun$handleChildChange$2.apply$mcV$sp(PartitionStateMachine.scala:448)
at
kafka.controller.PartitionStateMachine$DeleteTopicsListener$$anonfun$handleChildChange$2.apply(PartitionStateMachine.scala:445)
at
kafka.controller.PartitionStateMachine$DeleteTopicsListener$$anonfun$handleChildChange$2.apply(PartitionStateMachine.scala:445)
at kafka.utils.Utils$.inLock(Utils.scala:538)
at
kafka.controller.PartitionStateMachine$DeleteTopicsListener.handleChildChange(PartitionStateMachine.scala:445)
at org.I0Itec.zkclient.ZkClient$7.run(ZkClient.java:570)
at org.I0Itec.zkclient.ZkEventThread.run(ZkEventThread.java:71)

2. IllegalStateException due to "Kafka scheduler has not been started".

Issue Links

• duplicates: KAFKA-1270 controller logs exceptions during ZK session expiration
• duplicates: KAFKA-1272 controller logs exceptions during ZK session expiration