@Override
    public String toString() {
      return "[activeContainerID: " + this.activeContainerID + " activeContainerResourceID: "
          + this.activeContainerResourceID + " selectedStandbyContainers:" + selectedStandbyContainers
          + " resourceRequests: " + resourceRequests + "]";
    }
Encapsulates metadata concerning the failover of an active container.
samza-core/src/main/java/org/apache/samza/clustermanager/StandbyContainerManager.java