Amir Langer created HDFS-5731:
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Summary: Refactoring to define interfaces between BM and NN and
simplify the flow between them
Key: HDFS-5731
URL: https://issues.apache.org/jira/browse/HDFS-5731
Project: Hadoop HDFS
Issue Type: Sub-task
Components: namenode
Reporter: Amir Langer
Start the separation of BlockManager (BM) from NameNode (NN) by simplifying the
flow between the two components and defining API interfaces between them.
The two components still exist in the same VM and use the same memory space
(using the same instances).
Logic to calls from Datanodes should be in the BM.
NN should interact with BM using few calls and BM should use the return types
as much as possible to pass information to the NN.
APIs between them should be defined as interfaces so later it can be improved
to not use the same object instances and turned into a real protocol.
This still assumes a one to one relation between NN and BM, same VM and does
not handle lifecycle of the service.
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