Kapil Thangavelu updated ZOOKEEPER-770:

    Priority: Minor  (was: Major)

> Slow add_auth calls with multi-threaded client
> ----------------------------------------------
>                 Key: ZOOKEEPER-770
>                 URL: https://issues.apache.org/jira/browse/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
>            Priority: Minor
> 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 ( 
> http://bazaar.launchpad.net/~hazmat/zookeeper/fast-auth-instrumented/revision/647).
>  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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