Slow add_auth calls with multi-threaded client

                 Key: ZOOKEEPER-770
             Project: Zookeeper
          Issue Type: Bug
          Components: c client, contrib-bindings
    Affects Versions: 3.3.0, 3.4.0
         Environment: ubuntu lucid (10.04), zk trunk (3.4)
            Reporter: Kapil Thangavelu

Calls to add_auth are a bit slow from the c client library. The auth callback 
typically takes multiple seconds to fire. I instrumented the java, c binding, 
and python binding with a few log statements to find out where the slowness was 
occuring (
 It looks like when the io thread polls, it doesn't register interest in the 
incoming packet, so the auth success message from the server and the auth 
callback are only processed when the poll timeouts. I tried modifying 
mt_adapter.c so the poll registers interest in both events, this causes a 
considerably more wakeups but it does address the issue of making add_auth 
fast.  I think the ideal solution would be some sort of additional auth 
handshake state on the handle, that zookeeper_interest could utilize to suggest 
both POLLIN|POLLOUT are wanted for subsequent calls to poll during the auth 
handshake handle state.

i'm attaching a script that takes 13s or 1.6s for the auth callback depending 
on the session time out value (which in turn figures into the calculation of 
the poll timeout).

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