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From "Jesse Yates (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3370) HDFS hardlink
Date Tue, 03 Jul 2012 06:21:23 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13405655#comment-13405655
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Jesse Yates commented on HDFS-3370:
-----------------------------------

Another, simpler way to do hardlinks with cross-server coordination (which in reality needs
something like Paxos, or suffer some more unavailability to ensure consistency) would be to
leverage ZooKeeper. Yes, -1 for another piece of infrastructure from this, but if does provide
all the cross-namespace transactionality we need and make reference counting and security
management significantly easier. Not quite client-library easy, but pretty darn close :)
                
> 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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