HistorySever maintains information of MapReduce applications executed over the cluster. The Rest API provides counters, attempts, and configuration information about the jobs and tasks. MapReduce HistoryServer starts at web address port
19888 by default. This could be configured by setting up the
mapreduce.jobhistory.webapp.address property in the
MapReduce HistoryServer REST APIs provide information about the finished applications executed over the cluster. These APIs have similar URI structures and information types as the MapReduce ApplicationMaster API. The MapReduce ApplicationMaster API is used when the application is in
RUNNING state. However, once the application is finished, the application data is accessed through the MapReduce HistoryServer API.
The URI format for MapReduce HistoryServer REST services is:
http://<history server http address:port>/ws/v1/history