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https://issues.apache.org/jira/browse/HDFS-5731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amir Langer updated HDFS-5731:
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Attachment: 0001-Separation-of-BM-from-NN-Step1-introduce-APIs-as-int.patch
patch are changes done on top of trunk and were last rebased to start from
commit:
HADOOP-10175. Har files system authority should preserve userinfo. Contributed
by Chuan Liu.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1553169
13f79535-47bb-0310-9956-ffa450edef68
> 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
> Attachments:
> 0001-Separation-of-BM-from-NN-Step1-introduce-APIs-as-int.patch
>
>
> 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.
> This task should maintain backward compatibility
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