* - Resource usage monitoring
 * - Periodic cleanup of abandoned resources
 * - Detailed resource tracking and reporting
 */
public class ResourceManager {

    private static final Logger log = LoggerFactory.getLogger(ResourceManager.class);
    private static final ResourceManager INSTANCE = new ResourceManager();

    private final Map<String, ResourceHolder> activeResources = new ConcurrentHashMap<>();

```
17/03/22 23:21:10 INFO DAGScheduler: Job 0 finished: reduce at SparkPi.scala:38, took 1.302805 s
Pi is roughly 3.1445191445191445
```

Job status can also be viewed in a browser by navigating to the YARN ResourceManager Web UI and clicking on job history server information.

### **4.2 WordCount**