How to use fully-eplicated and buddy-replicated caches with

[ne_vasya]

Hi,

I have a case where I need to fully replicate some data, but not all.

I understand that I could configure 2 different caches, but that would imply that I need to configure 2 different JGroups channels which makes me a bit uneasy for following reasons:

1. What if at some point 2 JGroups channels will have different topology for some reason (should not happen, but nevertheless it's possible).

2. If I configure 2 caches, then I get double PING traffic which I would like to avoid.

Is there any way 2 caches could reuse the same JGroups cluster?
Can I achieve this with options override feature?
Can I use options override on per-node level?

Thanks in advance.
Dmitriy Setrakyan
GridGain Systems

[fredrikj]

Why don't you just use separate regions in the cache?

I.e.:

root {}
 /data_a
 /... // first data set here
 /data_b
 /... // second data set here

That way you use one cache for your data.

[ne_vasya]

I initially intended to use different regions under root, but can I have different replication policies for different regions?

For example, can I have one region with full replication and another region with buddy replication?

Thanks,
Dmitriy

[manik]

"ne_vasya" wrote:
I initially intended to use different regions under root, but can I have different replication policies for different regions?

For example, can I have one region with full replication and another region with buddy replication?

Dmitriy, no this cannot be done at the moment. We are considering adding more configurability to regions (JBCACHE-64).

- Manik

[manik]

"ne_vasya" wrote:

I have a case where I need to fully replicate some data, but not all.

I understand that I could configure 2 different caches, but that would imply that I need to configure 2 different JGroups channels which makes me a bit uneasy for following reasons:

-- SNIP --

Is there any way 2 caches could reuse the same JGroups cluster?
Can I achieve this with options override feature?
Can I use options override on per-node level?

Yes, 2 Cache instances can share a single JGroups channel using the JGroups Multiplexer. There are sample configs in SVN.

And here's a wiki page with more info on the multiplexer: http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossCacheMultiplexer

In a nutshell, with the multiplexer, a single JGroups channel is created and shared among several cache instances. That way, one cache can be configured to use BR and the other can use total replication.