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https://issues.apache.org/jira/browse/HBASE-6233?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matteo Bertozzi updated HBASE-6233:
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Attachment: Restore-Snapshot-Hardlink-alternatives.pdf
I've attached a document that tries to describe the hardlink alternatives
(Reference Files, .META. Ref-count, Move & SymLink) in relation to the restore
and mount operations.
> [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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