[MAPREDUCE-4358] Reducers are assigned containers before all maps are assigned containers

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.0.0-alpha
• Component/s: mrv2
• Assignee: Unassigned
• Reporter: Ahmed Radwan
• Created: 20/Jun/12 19:39
• Updated: 17/Jul/12 22:48
• Resolved: 17/Jul/12 22:48

Description

Reducers start to get containers before all maps are. We have seen this issue and it is problematic since if there is no avaialable resources for the remaining maps, the job will just stall where reducers are waiting for mappers which are unable to start because there is no containers available.

Issue Links

• duplicates: MAPREDUCE-4299 Terasort hangs with MR2 FifoScheduler