Hi Jeroen,

I saw now that you already commented on the ticket, but for completeness 
sake:

All nodes still participate in the same DD (unless you limit with 
akka.cluster.distributed-data.role)

We have ideas for optimising the gossip so that less inter-DC gossip 
happens, between fewer cross-DC pairs but nothing is implemented yet. 
Tracked by issue: https://github.com/akka/akka/issues/23249

--
Johan
Akka Team

On Monday, October 2, 2017 at 9:20:51 AM UTC+2, Jeroen Gordijn wrote:
>
> Hi,
>
> I read the release notes of 2.5.6 and saw the Multi-DC Clustering 
> <https://www.google.com/url?q=https%3A%2F%2Fdoc.akka.io%2Fdocs%2Fakka%2Fcurrent%2Fscala%2Fcluster-dc.html&sa=D&sntz=1&usg=AFQjCNFgr40_TFffIPJk6NXm8CTD8nUy2g>
>  
> which looks interesting. Going through the doc I see information about 
> Cluster Singleton and Cluster Sharding and how it behaves with this new 
> feature. I'm using Distributed Data and I am wondering if there are any 
> changes for that?
>
> More specific:
>
>    - Do all nodes in all DC's still participate in the same DD, or is it 
>    a DD set per DC?
>    - If they still gossip all data to all nodes in all DC's: 
>    - Is there a change in the gossip interval that differs between within 
>       DC and over DC?
>       - Do all nodes gossip to other DC? Or is it like the described in 
>       the failure detection that only the oldest nodes do it?
>       - Currently the gossip prefers reachable over unreachable nodes, 
>       does this now take unreachable DC into account?
>    - Do you have any other info I missed with the questions above?
>
>
> Thanks in advance!
>
> Cheers,
>
> Jeroen
>

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