[TAJO-647] Work unbalance on disk scheduling of DefaultScheduler

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Fix Version/s: 0.8.0, 0.9.0
• Component/s: Resource Manager
• Assignee: Jinho Kim
• Reporter: Jinho Kim
• Created: 04/Mar/14 05:12
• Updated: 17/Mar/14 07:51
• Resolved: 13/Mar/14 13:48

Description

The main problem is that localAllocation does not find next lowest volume. and it will assign to remote in rack.
We should control the remote tasks.

• Leaf scheduling priorities
  1. tasks in a volume of host
  2. unknown disk, non-splitable in local host
  3. remote tasks in rack. (consider the remaining tasks)
  4. random remote tasks. (tail concurrency control of scheduled tasks)

Issue Links

• is related to: TAJO-689 NoSuchElementException occurs during assigning the leaf tasks