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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8465) Auto-drop rollback snapshot for snapshot restore
Date Wed, 01 May 2013 22:44:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13647024#comment-13647024
] 

Jonathan Hsieh commented on HBASE-8465:
---------------------------------------

bq. The name of rollback snapshot is not returned. Person issuing restore command may not
be aware of the existence of rollback snapshot. Later, when list_snapshots command reveals
the rollback snapshots, people are surprised. I think dropping the rollback snapshot is desirable.

I think we should have the user specify the snapshot taken on restore.  (and deprecate the
autonaming if that is confusing).

In v2 I don't see the change from dropRollback wording to snapshotOnRestore wording in the
code.  With this option we dropRollback but matteo's suggestion was to not even take the rollback
snapshot in the firstplace.

Following through would mean converting this 
 
{code}
+  private static final String RESTORE_DROP_ROLLBACK_SNAPSHOT="hbase.snapshot.restore.drop.rollback";
{code}

to something like {{... TAKE_SNAPSHOT_ON_RESTORE = "hbase.snapshot.restore.takesnapshot"}}

An example would be (default would be after the change would be true instead of false):

{code}
- public void restoreSnapshot(final byte[] snapshotName, final boolean dropRollbackSnapshot
+ public void restoreSnapshot(final byte[] snapshotName, final boolean takeSnapshot)
{code}
                
> Auto-drop rollback snapshot for snapshot restore
> ------------------------------------------------
>
>                 Key: HBASE-8465
>                 URL: https://issues.apache.org/jira/browse/HBASE-8465
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>             Fix For: 0.98.0, 0.95.1
>
>         Attachments: 8465-trunk-v1.txt, 8465-trunk-v2.txt
>
>
> Below is an excerpt from snapshot restore javadoc:
> {code}
>    * Restore the specified snapshot on the original table. (The table must be disabled)
>    * Before restoring the table, a new snapshot with the current table state is created.
>    * In case of failure, the table will be rolled back to the its original state.
> {code}
> We can improve the handling of rollbackSnapshot in two ways:
> 1. give better name to the rollbackSnapshot (adding {code}'-for-rollback-'{code}). Currently
the name is of the form:
>     String rollbackSnapshot = snapshotName + "-" + EnvironmentEdgeManager.currentTimeMillis();
> 2. drop rollbackSnapshot at the end of restoreSnapshot() if the restore is successful.
We can introduce new config param, named 'hbase.snapshot.restore.drop.rollback', to keep compatibility
with current behavior.

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