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https://issues.apache.org/jira/browse/HDFS-3370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268564#comment-13268564
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Namit Jain commented on HDFS-3370:
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Another usecase in Hive is to copy one table/partition to another
table/partition.
Ideally, we would like the following in Hive:
Copy Table T1 to T2.
The files under table location for T2 (say, /user/hive/warehouse/T2/0) can be a
link to the corresponding file in table T1
(say, /user/hive/warehouse/T1/0).
Having said that, one of the requirements is that the data should be modified
independently. So, if a new data is loaded into T1 (or T2),
those changes should not be visible to T2 (or T1 respectively).
> 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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