Hairong Kuang created HDFS-3370:
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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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