[jira] [Created] (KAFKA-1832) Async Producer will cause 'java.net.SocketException: Too many open files' when broker host does not exist

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

barney created KAFKA-1832:
-----------------------------

             Summary: Async Producer will cause 'java.net.SocketException: Too many open files' when broker host does not exist
                 Key: KAFKA-1832
                 URL: https://issues.apache.org/jira/browse/KAFKA-1832
             Project: Kafka
          Issue Type: Bug
          Components: producer 
    Affects Versions: 0.8.1.1, 0.8.1
         Environment: linux
            Reporter: barney
            Assignee: Jun Rao


How to replay the problem:
1) producer configuration:
1.1) producer.type=async
1.2) metadata.broker.list=not.existed.com:9092
Make sure the host 'not.existed.com' does not exist in DNS server or /etc/hosts;
2) send a lot of messages continuously using the above producer
It will cause 'java.net.SocketException: Too many open files' after a while, or you can use 'lsof -p $pid|wc -l' to check the count of open files which will be increasing as time goes by until it reaches the system limit(check by 'ulimit -n').

Problem cause:
In kafka.network.BlockingChannel, 
'channel.connect(new InetSocketAddress(host, port))'
this line with throw an exception 'java.nio.channels.UnresolvedAddressException' when broker host does not exist, and at this same time the field 'connected' is false;
In kafka.producer.SyncProducer, 'disconnect()' will not invoke 'blockingChannel.disconnect()' because 'blockingChannel.isConnected' is false which means the FileDescriptor will be created but never closed;

More:
When the broker is an unexisted ip(for example: metadata.broker.list=1.1.1.1:9092) instead of an unexisted host, the problem will not appear;
In SocketChannelImpl.connect(), 'Net.checkAddress()' is not in try-catch block but 'Net.connect()' is in, that makes the difference;

Temporary Solution:
In kafka.network.BlockingChannel:
try
{
    channel.connect(new InetSocketAddress(host, port))
}
catch
{
    case e: UnresolvedAddressException => 
    {
        disconnect();
        throw e
    }
}



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