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From "Zhihong Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6233) [brainstorm] snapshots: hardlink alternatives
Date Sat, 07 Jul 2012 16:32:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408711#comment-13408711
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Zhihong Ted Yu commented on HBASE-6233:
---------------------------------------

Nice writeup.
Although we don't know when HDFS-3370 would be implemented, hdfs snapshot v1 would be delivered
later this year.
Do we want to incur extra complexity in our codebase for the hadoop versions where there is
no hdfs snapshot ?
                
> [brainstorm] snapshots: hardlink alternatives
> ---------------------------------------------
>
>                 Key: HBASE-6233
>                 URL: https://issues.apache.org/jira/browse/HBASE-6233
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Matteo Bertozzi
>            Assignee: Matteo Bertozzi
>         Attachments: Restore-Snapshot-Hardlink-alternatives.pdf
>
>
> Discussion ticket around snapshots and hardlink alternatives.
> (See the HDFS-3370 discussion about hardlink and implementation problems)
> (taking for a moment WAL out of the discussion and focusing on hfiles)
> With hardlinks available taking snapshot will be fairly easy:
> * (hfiles are immutable)
> * hardlink to .snapshot/name to take snapshot
> * hardlink from .snapshot/name to restore the snapshot
> * No code change needed (on fs.delete() only one reference is deleted)
> but we don't have hardlinks, what are the alternatives?

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