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From "Liyin Tang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3370) HDFS hardlink
Date Fri, 08 Jun 2012 14:12:23 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291791#comment-13291791
] 

Liyin Tang commented on HDFS-3370:
----------------------------------

I planned to break this feature into several parts:
1) Implement the new FileSystem API: hardLink based on the INodeHardLinkFile and HardLinkFileInfo
class. Also handle the deletion properly.
2) Handle the DU operation and quote update properly.
3) Update the FSImage format and FSEditLog.

I have finished the part 1 but still work on part 2.
                
> HDFS hardlink
> -------------
>
>                 Key: HDFS-3370
>                 URL: https://issues.apache.org/jira/browse/HDFS-3370
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Hairong Kuang
>            Assignee: Liyin Tang
>         Attachments: HDFS-HardLink.pdf
>
>
> We'd like to add a new feature hardlink to HDFS that allows harlinked files to share
data without copying. Currently we will support hardlinking only closed files, but it could
be extended to unclosed files as well.
> Among many potential use cases of the feature, the following two are primarily used in
facebook:
> 1. This provides a lightweight way for applications like hbase to create a snapshot;
> 2. This also allows an application like Hive to move a table to a different directory
without breaking current running hive queries.

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