Alex,
I am really confused. What do you need to know the "minimal partition
redundancy" for? What will it give you?
D.
On Thu, Nov 23, 2017 at 2:25 PM, Alex Plehanov <plehanov.a...@gmail.com>
wrote:
> Example was in my previous letters: if we have in our cluster for cache
> group one partition with 2 copies (1 primary and 1 backup) and other
> partitions with 4 copies (1 primary and 3 backups), then minimal partition
> redundancy level for this cache group will be 2.
>
> Maybe code will be more clear than my description, I think it will be
> something like that:
>
> for (int part = 0; part < partitions; part++) {
> int partRedundancyLevel = 0;
>
> for (Map.Entry<UUID, GridDhtPartitionMap> entry :
> partFullMap.entrySet()) {
> if (entry.getValue().get(part) ==
> GridDhtPartitionState.OWNING)
> partRedundancyLevel++;
> }
>
> if (partRedundancyLevel < minRedundancyLevel)
> minRedundancyLevel = partRedundancyLevel;
> }
>
>
> 2017-11-23 4:04 GMT+03:00 Dmitriy Setrakyan <dsetrak...@apache.org>:
>
> > I think you are talking about the case when cluster temporarily gets into
> > unbalanced state and needs to rebalance. However, I am still not sure
> what
> > this metric would show. Can you provide an example?
> >
> > D.
> >
> > On Wed, Nov 22, 2017 at 2:10 PM, Alex Plehanov <plehanov.a...@gmail.com>
> > wrote:
> >
> > > It's not about caches.
> > > Each partition has certain amount of copies. Amount of copies may
> differ
> > > for different partitions of one cache group.
> > >
> > > This configuration possible:
> > > 1) With custom affinity function
> > > 2) When nodes left the cluster, till rebalancing is not finished
> > >
> > >
> > >
> > > 2017-11-23 0:18 GMT+03:00 Dmitriy Setrakyan <dsetrak...@apache.org>:
> > >
> > > > On Wed, Nov 22, 2017 at 12:39 PM, Alex Plehanov <
> > plehanov.a...@gmail.com
> > > >
> > > > wrote:
> > > >
> > > > > Hello Dmitriy,
> > > > >
> > > > > I agree.
> > > > >
> > > > > By "minimal partition redundancy level for cache group" I mean
> > minimal
> > > > > number of partition copies among all partitions of this cache
> group.
> > > > > For example, if we have in our cluster for cache group one
> partition
> > > > with 2
> > > > > copies (1 primary and 1 backup) and other partitions with 4 copies
> (1
> > > > > primary and 3 backups), then minimal partition redundancy level for
> > > this
> > > > > cache group will be 2.
> > > > >
> > > >
> > > > Such configuration within the same group would be impossible. All
> > caches
> > > > within the same group have identical total number of partitions and
> > > > identical number of backups. If that is not the case, then they fall
> > into
> > > > different groups.
> > > >
> > > > D.
> > > >
> > >
> >
>
