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From Bruce Snyder <bruce.sny...@gmail.com>
Subject Re: Message Send is fast with TCP transport, slow when using Discovery
Date Tue, 11 May 2010 19:34:13 GMT
On Tue, May 11, 2010 at 1:06 PM, Bryan Moore <bryan@bryanmoore.com> wrote:
> I've encountered what seems to me to be a very strange behavior when using
> discovery.
>
> Here is my original client connection setup...
>  "tcp://myserver:61616?jms.useAsyncSend=true"
>
> The writes to the queue occur very fast, approximately one per MS.
>
> INFO  2010-05-11 14:40:08,799 [Thread-5] com.dt.QueueLoader: Put file on
> queue:1273603208799
> INFO  2010-05-11 14:40:08,800 [Thread-5] com.dt.QueueLoader: Put file on
> queue:1273603208800
> INFO  2010-05-11 14:40:08,801 [Thread-5] com.dt.QueueLoader: Put file on
> queue:1273603208801
> INFO  2010-05-11 14:40:08,802 [Thread-5] com.dt.QueueLoader: Put file on
> queue:1273603208802
> INFO  2010-05-11 14:40:08,803 [Thread-5] com.dt.QueueLoader: Put file on
> queue:1273603208803
> INFO  2010-05-11 14:40:08,803 [Thread-5] com.dt.QueueLoader: Put file on
> queue:1273603208803
> INFO  2010-05-11 14:40:08,804 [Thread-5] com.dt.QueueLoader: Put file on
> queue:1273603208804
>
>
> Now if I change the connection setup to this...
> "discovery:multicast://default?jms.useAsyncSend=true"
>
> The writes slow down, one every 30-40 MS.
>
> INFO  2010-05-11 14:46:40,542 [Thread-6] com.dt.QueueLoader: Put file on
> queue:1273603600542
> INFO  2010-05-11 14:46:40,576 [Thread-6] com.dt.QueueLoader: Put file on
> queue:1273603600576
> INFO  2010-05-11 14:46:40,618 [Thread-6] com.dt.QueueLoader: Put file on
> queue:1273603600618
> INFO  2010-05-11 14:46:40,651 [Thread-6] com.dt.QueueLoader: Put file on
> queue:1273603600651
> INFO  2010-05-11 14:46:40,684 [Thread-6] com.dt.QueueLoader: Put file on
> queue:1273603600684
> INFO  2010-05-11 14:46:40,718 [Thread-6] com.dt.QueueLoader: Put file on
> queue:1273603600718
> INFO  2010-05-11 14:46:40,760 [Thread-6] com.dt.QueueLoader: Put file on
> queue:1273603600760
> INFO  2010-05-11 14:46:40,802 [Thread-6] com.dt.QueueLoader: Put file on
> queue:1273603600802
>
>
> Any idea what the cause could be?  Maybe I cannot pass useAsyncSend like I
> am when using discovery?

I think the problem can be attributed to the difference between the
nature of the synchronous vs. the asynchronous send operations. A
synchronous send is going to block while it sends whereas the
asychronous send will not block and instead the send will take place
using a separate thread in the background and this can take some time.

Bruce
-- 
perl -e 'print unpack("u30","D0G)U8V4\@4VYY9&5R\"F)R=6-E+G-N>61E<D\!G;6%I;\"YC;VT*"
);'

ActiveMQ in Action: http://bit.ly/2je6cQ
Blog: http://bruceblog.org/
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