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https://issues.apache.org/jira/browse/HBASE-50?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897257#action_12897257
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HBase Review Board commented on HBASE-50:
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Message from: "Chongxin Li" <[email protected]>
bq. On 2010-08-10 22:20:23, Ted Yu wrote:
bq. > src/main/java/org/apache/hadoop/hbase/io/Reference.java, line 156
bq. > <http://review.cloudera.org/r/467/diff/3/?file=6008#file6008line156>
bq. >
bq. > I think the current code is backward compatible. Boolean value of
true is interpreted as TOP, value of false is BOTTOM.
bq. > Since ENTIRE is introduced, this code is not backward compatible.
bq. >
bq. > See:
bq. >
http://download.oracle.com/javase/1.4.2/docs/api/java/io/DataOutput.html#writeBoolean%28boolean%29
Why it is not backward compatible when ENTIRE is introduces? The value for
ENTIRE is 2, different from the old written value of boolean.
- Chongxin
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> 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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