[HADOOP-610] Task Tracker offerService does not adequately protect from exceptions

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.7.1
• Fix Version/s: 0.8.0
• Assignee: Owen O'Malley
• Reporter: Owen O'Malley
• Created: 18/Oct/06 04:15
• Updated: 08/Jul/09 16:51
• Resolved: 24/Oct/06 21:18

Description

The TaskTracker's offerService loop doesn't handle exceptions, such as time outs well and will reset the task tracker. I believe this is the cause of most of the lost task trackers. The scenario looks like:

1. an rpc timeout in offerService
2. the task tracker cleans up (which takes 30 minutes with the task tracker locked up)
3. the task tracker is declared lost for not providing its heartbeat