Re: Unique object IDs and crush on object striping

[Brian Andrus <brian.andrus@xxxxxxxxxxxxx>]

On Tue, Jan 31, 2017 at 7:42 AM, Ukko <ukkohakkarainen@xxxxxxxxx> wrote:

Hi,

Two quickies:

1) How does Ceph handle unique object IDs without any

central information about the object names?

That's where CRUSH comes in. It maps an object name to a unique placement group ID based on the available placement groups. Some of my favorite explanations of data placement comes from the core Ceph developers. [1] [2]

2) How CRUSH is used in case of splitting an object in 

stripes?

The splitting/striping of data actually occurs at a layer above CRUSH. The clients handle that and calculate object placement with CRUSH based on unique object names.

 

Thanks!

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[1] https://youtu.be/05spXfLKKVU?t=9m14s

[2] https://youtu.be/lG6eeUNw9iI?t=18m49s

--

Brian Andrus

Cloud Systems Engineer

DreamHost, LLC

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