[MAPREDUCE-4596] Split StateMachine state from states seen by MRClientProtocol (for Job, Task, TaskAttempt)

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.0
• Fix Version/s: MR-3902, 2.0.3-alpha, 0.23.5
• Component/s: applicationmaster, mrv2
• Target Version/s: 2.0.2-alpha, MR-3902, 0.23.5
• Hadoop Flags: Reviewed
• Assignee: Siddharth Seth
• Reporter: Siddharth Seth
• Created: 27/Aug/12 21:42
• Updated: 06/Feb/13 17:05
• Resolved: 19/Oct/12 06:02

Description

State machine states are currently exposed via MRClienProtocol. This makes it tough to modify the AM state machines, or have an alternate AM with different state machines (MR-3902) without the changes being visible in MRClientProtocol (MRv2 equivalent of ClientProtocol).

Issue Links

• is related to: MAPREDUCE-3902 MR AM should reuse containers for map tasks, there-by allowing fine-grained control on num-maps for users without need for CombineFileInputFormat etc.