MapReduce ApplicationMaster REST APIs provide information about the running ApplicationMaster service. As mentioned in the earlier chapters, MapReduce ApplicationMaster is an application-specific service that manages execution of MapReduce job over a Hadoop-YARN cluster.
The URI format of MapReduce ApplicationMaster REST services is:
http://<proxy http address:port>/proxy/{appid}/ws/v1/mapreduce
Note
MapReduce ApplicationMaster REST APIs are accessed using a proxy server, that is, Web Application Proxy server. Proxy server is an optional service in YARN. An administrator can configure the service to run on a particular host or on the ResourceManager itself (stand-alone mode). If the proxy server is not configured, then it runs as a part of the ResourceManager service.
By default, REST calls could be made to the web address port of ResourceManager 8088. It could also be explicitly set using the yarn.web-proxy.address property in the yarn-site.xml file...
