Re: crush chooseleaf vs. choose

[Wido den Hollander <wido@xxxxxxxx>]

On 01/02/2014 10:40 AM, Dietmar Maurer wrote:
> I try to understand the default crush rule:
>
> rule data {
>
>          ruleset 0
>
>          type replicated
>
>          min_size 1
>
>          max_size 10
>
>          step take default
>
>          step chooseleaf firstn 0 type host
>
> step emit
>
> }
>
> Is this the same as:
>
> rule data {
>
>          ruleset 0
>
>          type replicated
>
>          min_size 1
>
>          max_size 10
>
>          step take default
>
>          step choose firstn 0 type host
>
>          step choose firstn 1 type osd
>
>          step emit
>
> }
>
> Or what is the correct way to translate ‘chooseleaf’ into ‘choose’?

iirc, chooseleaf goes down the tree and descents into multiple leafs to 
find what you are looking for.

choose goes into that leaf and tries to find what you are looking for 
without going into subtrees.

Wido

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--
Wido den Hollander
42on B.V.

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