public final void requestResource(String processorId, String preferredHost) {
    requestResourceWithDelay(processorId, preferredHost, Duration.ZERO);
  }
Requests a resource from the cluster manager
@param processorId Samza processor ID that will be run when a resource is allocated for this request
@param preferredHost name of the host that you prefer to run the processor on
samza-core/src/main/java/org/apache/samza/clustermanager/ContainerAllocator.java