title: How to apply concurrent processing on worker verticles using vert.x
body: <p>Vert.x docs mentioning this
  :
  By default worker verticle instance will only be executed by one thread at any one time (it is not concurrent).</p>
  
  <p>So that means that if I have Verticle with 20 instances e.g:</p>
  
  <pre><code> vertx.deployVerticle(PotEventConsumerVerticle.class.getName(),
                  new DeploymentOptions()
                          .setWorker(true)
                          .setInstances(20)
  </code></pre>
  
  <p>I wont be able to get concurrent processing of requests?</p>
  
  <p>how could I concurrent this processing ?
  I saw that Multi-threaded worker verticles can be an option but Vert.x doc mention to avoid using this option by all means.</p>