We're seeing thousands of these a day in our zookeeper logs (zookeeper 3.4.6):
WARN  [NIOServerCxn.Factory:X.X.X.X/X.X.X.X:Y:NIOServerCnxn@357] - caught end 
of stream exceptionEndOfStreamException: Unable to read additional data from 
client sessionid 0xABC, likely client has closed socket
    at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:228)
    at 
org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:208)
    at java.lang.Thread.run(Thread.java:745)

Any ideas of the cause of this?  Could an excessive number/size of znodes be a 
factor? We're not seeing any obvious client-side issues. We're not sure but we 
believe that these were not happening earlier.  

-- John

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