Re: Ruleset vs replica count

[David Turner <drakonstein@xxxxxxxxx>]

> min_size 1

STOP THE MADNESS.  Search the ML to realize why you should never user a min_size of 1.

I'm curious as well as to what this sort of configuration will do for how many copies are stored between DCs.

On Thu, Aug 24, 2017 at 1:03 PM Sinan Polat <sinan@xxxxxxxx> wrote:

Hi,

 

In a Multi Datacenter Cluster I have the following rulesets:

------------------

rule ams5_ssd {

        ruleset 1

        type replicated

        min_size 1

        max_size 10

        step take ams5-ssd

        step chooseleaf firstn 2 type host

        step emit

        step take ams6-ssd

        step chooseleaf firstn -2 type host

        step emit

}

rule ams6_ssd {

        ruleset 2

        type replicated

        min_size 1

        max_size 10

        step take ams6-ssd

        step chooseleaf firstn 2 type host

        step emit

        step take ams5-ssd

        step chooseleaf firstn -2 type host

        step emit

}

------------------

 

The replication size is set to 3.

 

When for example ruleset 1 is used, how is the replication being done? Does it store 2 replica’s in ams5-ssd and store 1 replica in ams6-ssd? Or does it store 3 replicas in ams5-ssd and 3 replicas in ams6-ssd?

 

Thanks!

 

Sinan

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