[infinispan-dev] Trigger NBST for Auto-Placer

[Pedro Ruivo]

Hi Dan,

On 2/12/13 3:12 PM, Dan Berindei wrote:
> Hi Pedro
>
> When I split off the RebalancePolicy I was thinking that when a 
> RebalancePolicy needs to collaborate with a ConsistentHashFactory, 
> they should do so via another cache manager-scoped component. But that 
> doesn't really work (yet?), because ConsistentHashFactory can't access 
> any components.
I didn't understand the previous sentence... Do I need to invoke 
anything in the RebalancePolicy?

So far, I'm invoking directly in the ClusterTopologyManager: 
https://github.com/pruivo/infinispan/blob/cloudtm_v2/core/src/main/java/org/infinispan/dataplacement/DataPlacementManager.java#L246

Thanks!

Cheers,
Pedro
>
> I think it would be better to extend 
> ClusterTopologyManager.triggerRebalance (and 
> ConsistentHashFactory.rebalance) to accept an arbitrary Object 
> parameter. Then RebalancePolicy could use this parameter to pass extra 
> information to the CHF, like your Mappings object, and then when 
> ClusterTopologyManagerImpl asks for a balanced CH, the CHF will 
> include the Mappings in the result CH. What do you think?
>
> In order to trigger the rebalance you have to call startRebalance, and 
> the new ("balanced") consistent hash must not be equal to the existing 
> consistent hash. See 
> https://github.com/infinispan/infinispan/blob/master/core/src/main/java/org/infinispan/topology/ClusterTopologyManagerImpl.java#L389
>
> Cheers
> Dan
>
>
>
>
> On Thu, Feb 7, 2013 at 10:05 PM, Pedro Ruivo <pruivo at gsd.inesc-id.pt 
> <mailto:pruivo at gsd.inesc-id.pt>> wrote:
>
>     Hi,
>
>     I'm working in a way to rebase auto-placer on top of NBST and I
>     have one
>     question...
>     If you have already forgot, auto-placer analyzes the workload and
>     tries
>     to move the most remote accessed keys to the corresponding requester.
>
>     After calculating the new mappings, I want to trigger the NBST
>     with this
>     mapping. I'm thinking to add a new method in the
>     ClusterTopologyManager,
>     something like:
>
>     triggerAutoPlacer(String cacheName, Mappings newMappings);
>
>     and this method it will be a duplicate of triggerRebalance but instead
>     of doing chFactory.rebalance(CH) (in the startRebalance() method) I'm
>     thinking to do chFactory.autoPlacer(CH, Mappings). The last method
>     will
>     override the defautl CH location.
>
>     Question: will this solution trigger the NBST or do I have to
>     create the
>     triggerAutoPlacer() method in another class?
>
>     ps. forget the methods names... I will think in better names later
>
>     Thanks!!
>
>     Cheers,
>     Pedro
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