Grouper Developers Forum

[Keith Hazelton <>]

On 10/23/12, Jim Fox  wrote:
...
...
> >3. The polling doesn't seem like it scales... if every need to get a 
> >message is a poll (every minute? every 15 seconds?) then that are a lot of 
> >SSL web service requests as opposed to a socket which is just waiting for 
> >traffic. If you have a lot of apps on a machine or a cluster it seems like 
> >this polling can add up.
> 
> We first used the direct connection from SNS to an http app, but it turned 
> out, for this application, to have the SNS topic send to an SQS queue from 
> which we pull the messages. We use a sliding polling frequency. As long as 
> there are messages on the queue we retrieve the next immediately. If the 
> queue is empty we wait a minute and then poll. If that goes on very long we 
> back off to five minutes per poll.

This approach is further described in a blog post on 
forecastcloudy.net: http://bit.ly/pl55Yr 


 --Keith
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