@Override
  public String toString() {
    return "SamzaResource{" +
        "host='" + host + '\'' +
        ", containerId='" + containerId + '\'' +
        '}';
  }
Specification of a Samza Resource. A resource is identified by a unique resource ID.
A resource is currently comprised of CPUs and Memory resources on a host.
samza-core/src/main/java/org/apache/samza/clustermanager/SamzaResource.java