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https://issues.apache.org/jira/browse/HBASE-6230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13407357#comment-13407357
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Matteo Bertozzi commented on HBASE-6230:
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I think that the 3 foundamental blocks for restore are:
* Restore Table - restore <snapshot name>
* Clone Table - clone <snapshot name> <table name> [readonly]
* Export snapshot - hbase o.a.h.h.mapreduce.ExportSnapshot <snapshot name>
<address>
On top of these operation you can create all the tools that you want to allow
to allow the user to restore just a piece of data, show the difference between
snapshot A, snapshot B and the original table, and so on...
h5. Restore Table
Given a "snapshot name" restore override the original table with the snapshot
content.
Before restoring a new snapshot of the table is taken, just to avoid bad
situations.
(If the table is not disabled we can keep serving reads)
This allows a full and quick rollback to a previous snapshot.
h5. Clone Table
Given a "snapshot name" a new table is created with the content of the
specified snapshot.
This operation allows:
* To have an old version of the table in parallel with the current one.
** Look at snapshot side-by-side with the "current" before making the decision
whether to roll back or not
* To Restore only "individual items" (only some small range of data was lost
from "current")
** MR job that scan the cloned table and update the data in the original one.
(Partial restore of the data)
* if the table is not marked as read-only
** To Add/Remove data from this table without affecting the original one or
the snapshot.
h5. Export Snapshot
Copy the "snapshot name" to the specified cluster. This will be more or less a
distcp of the snapshot folder. And allows you to copy a snapshotted table
without going through CopyTable. After this operation the snapshot will be
visible with "list_snapshot" and can be restored or cloned.
> [brainstorm] "Restore" snapshots for HBase 0.96
> -----------------------------------------------
>
> Key: HBASE-6230
> URL: https://issues.apache.org/jira/browse/HBASE-6230
> Project: HBase
> Issue Type: Brainstorming
> Reporter: Jesse Yates
> Assignee: Matteo Bertozzi
>
> Discussion ticket around the definitions/expectations of different parts of
> snapshot restoration. This is complementary, but separate from the _how_ of
> taking a snapshot of a table.
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