[MAPREDUCE-4059] The history server should have a separate pluggable storage/query interface

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.3, 2.0.0-alpha
• Fix Version/s: 0.23.3, 2.0.2-alpha
• Component/s: mrv2
• Target Version/s: 0.23.3
• Assignee: Robert Joseph Evans
• Reporter: Robert Joseph Evans
• Created: 23/Mar/12 14:59
• Updated: 10/Mar/15 04:31
• Resolved: 10/Apr/12 18:15

Description

The history server currently caches all parsed jobs in RAM. These jobs can be very large because of counters. It would be nice to have a pluggable interface for the cacheing and querying of the cached data so that we can play around with different implementations. Also just for cleanness of the code it would be nice to split the very large JobHistoryServer.java into a few smaller ones that are more understandable and readable.

Issue Links

• depends upon: MAPREDUCE-4024 RM webservices can't query on finalStatus