[infinispan-dev] Suppressing state transfer via JMX

[Manik Surtani]

On 31 May 2013, at 14:12, Adrian Nistor <anistor at redhat.com> wrote:

> ISPN-3140 only mentions suspending state transfer. The partial cluster shutdown scenario is part of ISPN-1394. Doesn't it make sense to merge them?

ISPN-3140 (manually suppressing state transfer) is regardless of partial or complete shutdown.  My example only detailed a full shutdown scenario, but applies in the case of a partial shutdown as well.

ISPN-1394 is much bigger - it covers not just suppressing state transfer but also initiating state transfer, which is much more complex IMO.

> 
> Cheers
> Adi
> 
> On 05/31/2013 03:52 PM, Dan Berindei wrote:
>> 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
>> 
>> 
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--
Manik Surtani
manik at jboss.org
twitter.com/maniksurtani

Platform Architect, JBoss Data Grid
http://red.ht/data-grid

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