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From "Amir Langer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5734) A NN-internal RPC BM service
Date Thu, 09 Jan 2014 05:41:51 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13866342#comment-13866342

Amir Langer commented on HDFS-5734:

BM = Block Manager

> A NN-internal RPC BM service
> ----------------------------
>                 Key: HDFS-5734
>                 URL: https://issues.apache.org/jira/browse/HDFS-5734
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Amir Langer
> 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.

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