[HADOOP-2016] Race condition in removing a KILLED task from tasktracker

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.14.2
• Fix Version/s: 0.15.0
• Assignee: Arun Murthy
• Reporter: Devaraj Das
• Created: 09/Oct/07 17:30
• Updated: 08/Jul/09 16:52
• Resolved: 12/Oct/07 15:35

Description

I ran into a situation where a speculative task was killed by the JobTracker and the relevant TaskTracker got the right KillTaskAction, but the tasktracker continued to hold a reference to that task (although the task jvm was killed). The task continued to be in RUNNING state in both the JobTracker and that TaskTracker for ever. I suspect there is some race condition in reading/updating datastructures inside the taskCleanupThread & transmitHeartBeat.