[jira] [Created] (KAFKA-690) TopicMetadataRequest throws exception when no topics are specified

["David Arthur (JIRA)" <ji...@apache.org>]

David Arthur created KAFKA-690:
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             Summary: TopicMetadataRequest throws exception when no topics are specified
                 Key: KAFKA-690
                 URL: https://issues.apache.org/jira/browse/KAFKA-690
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 0.8
            Reporter: David Arthur
             Fix For: 0.8


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)


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