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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8465) Auto-drop rollback snapshot for snapshot restore
Date Wed, 01 May 2013 23:16:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13647057#comment-13647057
] 

Ted Yu commented on HBASE-8465:
-------------------------------

bq. it is more likely to have a bad table than a bad snapshot.
Table being bad can mean two things: hbck would detect inconsistency or, table is in legitimate
state but the data inside the table is not desirable. In the second case, taking rollback
snapshot would help analyze how the table got into that state.

If we add takeSnapshot option, do we still need the dropRollbackSnapshot option (when takeSnapshot
is true) ?
                
> 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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