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https://issues.apache.org/jira/browse/HDFS-3370?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hairong Kuang updated HDFS-3370:
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Description:
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.
was:
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.
> 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 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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