[HDFS-5734] A NN-internal RPC BM service

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: namenode
• Assignee: Unassigned
• Reporter: Amir Langer
• Created: 08/Jan/14 14:16
• Updated: 09/Jan/14 05:40

Description

Separate the BM from NN by running it with with its own thread-pool and RPC protocol but still in the same process as NN.
NN and BM will in interact through some loopback call that will simulate a separate service.
This sprint still assumes a one to one relation between NN and BM and does not split the BM to a separate process, only simulates such a split inside the same VM. This allows us to defer any configuration issue / Testing support / scripts changes to later tasks.
This task will therefore also not handle any HA issue to the BM itself. It will, however, deal with having BM code actually running in a different thread to the NN code and will handle building the initialisation / lifecycle code to an independent BM.