Github user joshelser commented on a diff in the pull request:
https://github.com/apache/zookeeper/pull/186#discussion_r104792592
--- 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?
I believe this is OK. We can receive two concurrent `stat` commands, but we
only process one of them at a time. I'm also not a Netty wizard, so I could be
wildly wrong :)
> Basically I am wondering if there is any other code out there that should
now sync on what getRpcLock() returns.
That's a good point. I had looked to see that there were multiple other
methods in `ServerCnxn` which were also synchronized (thus, changing
`dumpConnectionInfo(..)` wouldn't have been sufficient). I didn't look to see
if there's another code-path which is also synchronizing on the
`NettyServerCnxn` (or `ServerCnxn`).
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