Hi @Rahul Gupta, Yes, a single node can have more than one application masters when we have several applications running; where each application master belongs to a unique application. None of the application master will be aware of the presence of the other. More info on AM https://hortonworks.com/blog/apache-hadoop-yarn-concepts-and-applications/ ... View more

Hello Rahul Your question is a little generic so hard to help you out much without things like the service used, the data read etc... This being said since we are in the yarn thread I suppose it is a yarn service like hive or spark. In your shoed I would go to to the yarn UI and job logs to understand where the latency happens: Is it in init phase is yarn waiting to get the containers in which case ressources or max am per queue are possible configurations to look at. Is it in the compute phase itself do you have "mappers" that are much longer in which case you need to look at things like container errors and restart or IO throughput, or data spill. The Tez UI has a very good tool Tez swimlane to get a high level view of the dag and get a sense of where to look. Same thing on the Spark side with the Spark UI. Hope any of this helps ... View more