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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2106) Umbrella JIRA for separating block management and name space management in NameNode
Date Tue, 28 Jun 2011 17:52:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13056674#comment-13056674
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Todd Lipcon commented on HDFS-2106:
-----------------------------------

This stuff is very interesting!

Do you have some fleshed out designs on how to handle some of the operations which are currently
"transactional" between blocks and inodes? eg how is it handled when a pipeline is broken,
and the block recovery has the side effect of changing an INodeFileUnderConstruction into
an INodeFile? I don't see leases anywhere in the API diagram either.

> Umbrella JIRA for separating block management and name space management in NameNode
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-2106
>                 URL: https://issues.apache.org/jira/browse/HDFS-2106
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: bm_api20110627.pdf
>
>
> Namenode has two main components, block management and namespace management.  The ultimate
goal is to allow BM and NM running in separated servers.  The short-term goal is to separate
the codes.

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