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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