@Dinesh Chitlangia Following code might give the idea on what you are looking out for: https://github.com/apache/hadoop/blob/release-2.8.0-RC0/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/ApplicationId.java#L53-L58 /**
* <p><code>ApplicationId</code> represents the <em>globally unique</em>
* identifier for an application.</p>
*
* <p>The globally unique nature of the identifier is achieved by using the
* <em>cluster timestamp</em> i.e. start-time of the
* <code>ResourceManager</code> along with a monotonically increasing counter
* for the application.</p>
*/
@Public
@Unstable
public static ApplicationId newInstance(long clusterTimestamp, int id) {
ApplicationId appId = Records.newRecord(ApplicationId.class);
appId.setClusterTimestamp(clusterTimestamp);
appId.setId(id);
appId.build();
return appId;
} . According to the API, The ApplicationId represents the globally unique identifier for an application. The globally unique nature of the identifier is achieved by using the "cluster timestamp" i.e. The start-time of the "ResourceManager<"/code>" along with a monotonically increasing counter for the application. https://github.com/apache/hadoop/blob/release-2.8.0-RC0/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/util/Records.java#L35-L37 .
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