[MAPREDUCE-817] Add a cache for retired jobs with minimal job info and provide a way to access history file url

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.21.0
• Component/s: client, jobtracker
• Hadoop Flags: Incompatible change, Reviewed

Release Note

Provides a way to configure the cache of JobStatus objects for the retired jobs.
Adds an API in RunningJob to access history file url.
Adds a LRU based cache for job history files loaded in memory when accessed via JobTracker web UI.
Adds Retired Jobs table on the Jobtracker UI. The job move from Running to Completed/Failed table. Then job move to Retired table when it is purged from memory. The Retired table shows last 100 retired jobs. The Completed/Failed jobs table are only shown if there are non-zero jobs in the table.

• Assignee: Sharad Agarwal
• Reporter: Sharad Agarwal
• Created: 31/Jul/09 07:21
• Updated: 24/Aug/10 21:14
• Resolved: 11/Aug/09 17:44

Description

MAPREDUCE-814 will provide a way to keep the job history files in HDFS. There should be a way to get the url for the completed job history fie. The completed jobs can be purged from memory more aggressively from jobtracker since the clients can retrieve the information from history file. Jobtracker can just maintain the very basic info about the completed jobs.

Issue Links

• incorporates: MAPREDUCE-757 JobConf will not be deleted from the logs folder if job retires from finalizeJob()
• is blocked by: MAPREDUCE-814 Move completed Job history files to HDFS