openstack team mailing list archive

[Michael Barton <mike-launchpad@xxxxxxxxxxxxxxxx>]

Overall I've never been super enthusiastic about erasure codes for
swift.  Figuring out which blocks are missing then re-assembling them
is a lot more difficult and expensive than what we do now.

But if you can come up with a good scheme for identifying missing
blocks and it doesn't double the amount of code in Swift, I'm sure we
all have use cases where we'd trade latency for disk usage.

- Michael


On Mon, Oct 15, 2012 at 7:36 PM, Duan, Jiangang <jiangang.duan@xxxxxxxxx> wrote:
> Some of our customers are interested in Erasure code than tri-replicate to save disk space.
> We propose a BP "Light weight Erasure code framework for swift", which can be found here https://blueprints.launchpad.net/swift/+spec/swift-ec
> The general idea is to have some daemon on storage node to do offline scan - select code object with big enough size to do EC.
>
> Will glad to hear any feedback on this.
>
>
> -jiangang
>
>
>
>
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