Hi,all
        I meet a problem with producer. When the producer client is 
initializing, it block for some minutes.    I find it block at "producer = new 
Producer<String, String>(config)".   Is it the problem of zookeeper? I think 
so. But I could not find what wrong with it.    The cluster is an zookeeper and 
four brokers.   At the begin, the cluster work well. The producer client and 
consumer client work well too.     But now, the initialization of producer 
client is very slow, it block at "producer = new Producer<String, 
String>(config)"      for some minutes. When the connection has finished, it 
work well.       The consumer client work well now. It has not occured block 
when initializing.  I use the kafka 0.7.1.  I want to know what is the reason. 
How can I resolve it?        Thanks. 

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