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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 19:11:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408746#comment-13408746
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Zhihong Ted Yu commented on HBASE-6233:
---------------------------------------

bq. But we can have a cleanup “tool” as the other alternatives (Reference Files, .META
refcount).
So structural changes are needed for symlink approach to work. We should carefully evaluate
the pros and cons of maintaining this new logic.
                
> [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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