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POHow do I scale my Scala REST application that uses Akka?
 

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  1. POHow do I scale my Scala REST application that uses Akka?
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    <p>I have a Scala application using Akka that receives REST requests, makes some operations against a database, and responds with some information to the client. As it is, my db operations take a long time and my REST-enabled actor is unable to respond to new requests in the meantime, even though I could run lots of operations concurrently against the DB. I'm using the javax.ws.rs annotations to REST-enable methods in my actor.</p> <p>The question; what is the best way to enable my application to handle a large number of concurrent requests?</p> <p><strong>EDIT</strong>: I'll add some sample code.</p> <pre><code> import se.scalablesolutions.akka.actor._ import javax.ws.rs._ @Path("/test") class TestService { @GET def status() = actorPool !! Status(session). getOrElse(&lt;error&gt;Unable to connect to service&lt;/error&gt;) } class TestActor { def receive = { case Status() =&gt; { reply(SomeObject.slowDBMethod) } } } case class Status() </code></pre> <p><strong>EDIT2</strong>: This is what I'm getting in the log. I'm sending the three requests from my browser as fast as I can switch tabs and press F5, but the RS bean still waits for the first request to complete before handling the next.</p> <pre><code>[INFO] [2010-08-29 16:27:03,232] [akka:event-driven:dispatcher:global-15] c.n.StatusActor: got Slow request [INFO] [2010-08-29 16:27:06,916] [akka:event-driven:dispatcher:global-10] c.n.StatusActor: got Slow request [INFO] [2010-08-29 16:27:10,589] [akka:event-driven:dispatcher:global-3] c.n.StatusActor: got Slow request </code></pre>
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    1. COYou may want to look into Apache Bench instead of pressing F5 so much Great tool for concurrency testing. http://httpd.apache.org/docs/2.2/programs/ab.html
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