[KAFKA-690] TopicMetadataRequest throws exception when no topics are specified

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Fix Version/s: 0.8.0
• Component/s: core
• Assignee: David Arthur
• Reporter: David Arthur
• Created: 09/Jan/13 00:50
• Updated: 09/Jan/13 16:49
• Resolved: 09/Jan/13 16:49

Description

If no topics are sent in a TopicMetadataRequest, `readFrom` throws an exception when trying to get the the head of the topic list for a debug statement.

java.util.NoSuchElementException: head of empty list
at scala.collection.immutable.Nil$.head(List.scala:386)
at scala.collection.immutable.Nil$.head(List.scala:383)
at kafka.api.TopicMetadataRequest$$anonfun$readFrom$2.apply(TopicMetadataRequest.scala:43)
at kafka.api.TopicMetadataRequest$$anonfun$readFrom$2.apply(TopicMetadataRequest.scala:43)
at kafka.utils.Logging$class.debug(Logging.scala:51)
at kafka.api.TopicMetadataRequest$.debug(TopicMetadataRequest.scala:25)
at kafka.api.TopicMetadataRequest$.readFrom(TopicMetadataRequest.scala:43)
at kafka.api.RequestKeys$$anonfun$4.apply(RequestKeys.scala:37)
at kafka.api.RequestKeys$$anonfun$4.apply(RequestKeys.scala:37)
at kafka.network.RequestChannel$Request.<init>(RequestChannel.scala:47)
at kafka.network.Processor.read(SocketServer.scala:320)
at kafka.network.Processor.run(SocketServer.scala:231)
at java.lang.Thread.run(Thread.java:680)

Issue Links

• contains: KAFKA-653 Allow getTopicMetadata to get metadata for all topics