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https://issues.apache.org/jira/browse/HBASE-50?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12887983#action_12887983
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stack commented on HBASE-50:
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I took a quick look Li.
What is the SNAPSHOTINFO_FILE? Is it name of file that we write snapshot data
to? Should it be named for the snapshot name? Looks like you name the dir
that holds this file for the snapshot name? Do we need a directory? Can we
get away with just files that are named fo the snapshot name and that hold the
snapshot data?
You should add javadoc comments to your classes; say what the class is for
(hmm... seems like you usually doo... just the first few in this commit seem to
be missing them... they are there for the others).
So far, it looks great. Keep up the good work. Tests next I'd say.
> Snapshot of table
> -----------------
>
> Key: HBASE-50
> URL: https://issues.apache.org/jira/browse/HBASE-50
> Project: HBase
> Issue Type: New Feature
> Reporter: Billy Pearson
> Assignee: Li Chongxin
> Priority: Minor
> Attachments: HBase Snapshot Design Report V2.pdf, HBase Snapshot
> Design Report V3.pdf, HBase Snapshot Implementation Plan.pdf, Snapshot Class
> Diagram.png
>
>
> Havening an option to take a snapshot of a table would be vary useful in
> production.
> What I would like to see this option do is do a merge of all the data into
> one or more files stored in the same folder on the dfs. This way we could
> save data in case of a software bug in hadoop or user code.
> The other advantage would be to be able to export a table to multi locations.
> Say I had a read_only table that must be online. I could take a snapshot of
> it when needed and export it to a separate data center and have it loaded
> there and then i would have it online at multi data centers for load
> balancing and failover.
> I understand that hadoop takes the need out of havening backup to protect
> from failed servers, but this does not protect use from software bugs that
> might delete or alter data in ways we did not plan. We should have a way we
> can roll back a dataset.
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