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https://issues.apache.org/jira/browse/HADOOP-3637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12610377#action_12610377
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dhruba borthakur commented on HADOOP-3637:
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Hong: I agree with your refinement of Requirement 1. For scalability reasons,
it might be worthwhile to require that the namenode should not have to contact
all datanodes at the time of snapshot creation.
Joydeep: I do not plan on implementing a write-able snaphsot at present.
However, if the requrement/design is such that it will encompass write-able
snapshots in the future, it will be good, isn't it? I think of hadoop more like
a data warehouse and archive packaged into one. When an administrator/user
creates a snaopshot, it would be nice to be able to at-least annotate that
snapshot will some more metadata. The annotatation can be done by writing a
arbitrary size label into a new file in the snapshot, i.e. ability to do write
to the snapshot!
> Support for snapshots
> ---------------------
>
> Key: HADOOP-3637
> URL: https://issues.apache.org/jira/browse/HADOOP-3637
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> Support HDFS snapshots. It should support creating snapshots without shutting
> down the file system. Snapshot creation should be lightweight and a typical
> system should be able to support a few thousands concurrent snapshots. There
> should be a way to surface (i.e. mount) a few of these snapshots
> simultaneously.
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