[MAPREDUCE-540] Upate thread in FairScheduler runs too frequently

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Assignee: Matei Alexandru Zaharia
• Reporter: Vinod Kumar Vavilapalli
• Created: 06/Feb/09 09:38
• Updated: 30/Jun/09 22:00
• Resolved: 30/Jun/09 20:49

Description

The UpdateThread in FairScheduler runs every 500ms (hardcoded). This proves to be very costly when running large clusters. UpdateThread tries to acquire lock on JT object every that often and so seriously affects HeartBeat processing besides everything else. The update interval should be a function of the cluster size. Or in the minimum it should be configurable and by default should be set to a reasonably high default value.