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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3370) HDFS hardlink
Date Fri, 04 May 2012 17:14:48 GMT
Hairong Kuang created HDFS-3370:
-----------------------------------

             Summary: 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


We'd like to add a new feature to HDFS, hardlink, 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 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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