Overview: Storage and retrieval of applications's current as well as historic information in a generic fashion is solved in YARN through the Timeline server.
This server two responsibilities:
1) Generic information about completed applications.
Ex: Application level data like queue name ,user information etc.
2) Pre-framework information about completed applications. Ex: Hadoop MapReduce framework can include pieces of information like number of map task and reduce task, counters etc.
Configuration:
