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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-50) Snapshot of table
Date Thu, 01 Apr 2010 16:40:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-50?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852446#action_12852446
] 

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

One idea floated around here was to use HDFS-level hard links on files that would prevent
HBase from being able to move/delete them.

Why is it that you say we cannot flush and instead need to use the WAL?  Just an overhead
thing?  If so, makes sense, but just wondering if you think it's a requirement or just a different
strategy.

It's likely that we will need to spend some effort on this jira in the near future.  Thanks
for freshening.

> 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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