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 <[email protected]
<mailto:[email protected]>> 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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