[infinispan-dev] Suppressing state transfer via JMX

[Dan Berindei]

If we only want to deal with full cluster shutdown, then I think stopping
all application requests, calling Cache.clear() on one node, and then
shutting down all the nodes should be simpler. On start, assuming no cache
store, the caches will start empty, so starting all the nodes at once and
only allowing application requests when they've all joined should also work
without extra work.

If we only want to stop a part of the cluster, suppressing rebalancing
would be better, because we wouldn't lose all the data. But we'd still lose
the keys whose owners are all among the nodes we want to stop. I've
discussed this with Adrian, and we think if we want to stop a part of the
cluster without losing data we need a JMX operation on the coordinator that
will "atomically" remove a set of nodes from the CH. After the operation
completes, the user will know it's safe to stop those nodes without losing
data.

When it comes to starting a part of the cluster, a "pause rebalancing"
option would probably be better - but again, on the coordinator, not on
each joining node. And clearly, if more than numOwner nodes leave while
rebalancing is suspended, data will be lost.

Cheers
Dan



On Fri, May 31, 2013 at 12:17 PM, Manik Surtani <msurtani at redhat.com> wrote:

> Guys
>
> We've discussed ISPN-3140 elsewhere before, I'm brining it to this forum
> now.
>
> https://issues.jboss.org/browse/ISPN-3140
>
> Any thoughts/concerns?  Particularly looking to hear from Dan or Adrian
> about viability, complexity, ease of implementation.
>
> Thanks
> Manik
> --
> Manik Surtani
> manik at jboss.org
> twitter.com/maniksurtani
>
> Platform Architect, JBoss Data Grid
> http://red.ht/data-grid
>
>
> _______________________________________________
> infinispan-dev mailing list
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