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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4987) Namenode changes to track multiple storages
Date Tue, 27 Aug 2013 17:29:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13751473#comment-13751473
] 

Arpit Agarwal commented on HDFS-4987:
-------------------------------------

Hi Nicholas,

Couple of comment related nitpicks we can fix later.

# BlockInfo.java:44 - Comment should be updated to say {{"block belongs to triplets[3*i] is
the reference to the StorageInfo"}}
# BlockInfo#findStorageInfo - Javadoc needs to be updated to {{"   * @param dn"}}

                
> Namenode changes to track multiple storages
> -------------------------------------------
>
>                 Key: HDFS-4987
>                 URL: https://issues.apache.org/jira/browse/HDFS-4987
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Suresh Srinivas
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h4987_20130822.patch, h4987_20130827b.patch, h4987_20130827c.patch,
h4987_20130827.patch
>
>
> Currently namenode track in BlockInfo, the corresponding DataNodeDescriptor. I propose
changing this with new abstraction StorageDescriptor. This change will also make DatanodeDescriptor
a collection of StroageDescriptors. This will allow given a block, identify its storage and
also Datanode.

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