Managing applications You can use YARN Services API to manage long-running YARN applications. You can use the YARN CLI to view the logs for running applications. In addition, you can use YARN distributed cache to deploy multiple versions of Mapreduce. Manage long-running YARN applicationsYou can use the YARN Services API to manage long-running YARN applications. Configure Cross-Origin Support on YARNCross-Origin Resource Sharing (CORS) is enabled by default on YARN so that the corresponding services accept cross-origin requests from only selected domains. Enabling CORS also helps the YARN UI fetch data endpoints from the browser.