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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6230) [brainstorm] "Restore" snapshots for HBase 0.96
Date Thu, 05 Jul 2012 18:28:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13407357#comment-13407357

Matteo Bertozzi commented on HBASE-6230:

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

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