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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-50) Snapshot of table
Date Mon, 05 Apr 2010 22:40:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-50?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853576#action_12853576
] 

Jonathan Gray commented on HBASE-50:
------------------------------------

In talking to some HDFS guys, it seems there may be a way we could hard-lock files in HDFS
so HBase could continue to do this thing but we could guarantee files would not be deleted
or moved.  This could be much simpler than managing a long-running special state inside of
HBase, and then the snapshot-mode can be much shorter lived (rather than having to stay around
for distcp or whatever)

> Snapshot of table
> -----------------
>
>                 Key: HBASE-50
>                 URL: https://issues.apache.org/jira/browse/HBASE-50
>             Project: Hadoop HBase
>          Issue Type: New Feature
>            Reporter: Billy Pearson
>            Priority: Minor
>
> 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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