Minor Description
ZookeeperConsumerConnector generates group ID by taking the local hostname:
consumerUuid = "%s-%d-%s".format(
InetAddress.getLocalHost.getHostName, System.currentTimeMillis,
uuid.getMostSignificantBits().toHexString.substring(0,8))
If localhost doesn't resolve (something that happens occasionally), this will fail with following error:
Exception in thread "main" java.net.UnknownHostException: Billc-cent70x64: Billc-cent70x64: Name or service not known
at java.net.InetAddress.getLocalHost(InetAddress.java:1473)
at kafka.consumer.ZookeeperConsumerConnector.<init>(ZookeeperConsumerConnector.scala:119)
at kafka.consumer.ZookeeperConsumerConnector.<init>(ZookeeperConsumerConnector.scala:142)
at kafka.consumer.Consumer$.create(ConsumerConnector.scala:89)
at kafka.tools.ConsoleConsumer$.main(ConsoleConsumer.scala:149)
at kafka.tools.ConsoleConsumer.main(ConsoleConsumer.scala)
Caused by: java.net.UnknownHostException: Billc-cent70x64: Name or service not known
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1293)
at java.net.InetAddress.getLocalHost(InetAddress.java:1469)
... 5 more
Normally requiring a resolving localhost is not a problem, but here is seems a bit frivolous - its just for generating an ID, nothing network related.
I think we can catch the exception and generate an ID without the hostname.
This is low priority since the issue can be easily worked around (add the hostname to /etc/hosts) and since this API is going away anyway with the new consumer API.
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