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https://issues.apache.org/jira/browse/HADOOP-3637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12626797#action_12626797
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dhruba borthakur commented on HADOOP-3637:
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Just to clarify on Doug' comments:
>Perhaps snapshots should never be held in memory, but rather dealt with as an
>on-disk datastructure? Thus it would be >possible to browse snapshots, but not
>very quickly.
We can come up with a plan to read snapshots directly from the disk image.
However, the SnapNode still has to exist because it has to replicate blocks in
the snapshot.
Once we have the ability to serve snapshot data directly from the fsimage on
disk, the same technique could be used to serve data from the primary
namespace! But I plan to do it as a separate JIRA as not as part of snapshots.
Does it make sense?
> 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
> Attachments: Snapshots.pdf, Snapshots.pdf
>
>
> 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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