Github user keith-turner commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/186#discussion_r104790720
  
    --- Diff: 
src/java/main/org/apache/zookeeper/server/NettyServerCnxnFactory.java ---
    @@ -162,7 +162,7 @@ public void messageReceived(ChannelHandlerContext ctx, 
MessageEvent e)
                                 + " from " + ctx.getChannel());
                     }
                     NettyServerCnxn cnxn = 
(NettyServerCnxn)ctx.getAttachment();
    -                synchronized(cnxn) {
    +                synchronized(cnxn.getRpcLock()) {
                         processMessage(e, cnxn);
    --- End diff --
    
    Now one thread can be in processMessage while another thread is getting 
stats about the connection.  Is that ok?  
    
    Do you know if anything else besides ServerCnxn is synchronizing on its 
monitor?  Basically I am wondering if there is any other code out there that 
should now sync on what getRpcLock() returns.


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