[infinispan-dev] Asymmetric caches and manual rehashing design

[Mircea Markus]

On 29 Sep 2011, at 08:06, Bela Ban wrote:

> 
> 
> On 9/28/11 4:24 PM, Mircea Markus wrote:
>> Nice stuff.
>> 
>> Some q:
>> 
>> - When a node CM that has c1 and c2 caches running on it goes down, you'll end up having  REQUEST_LEAVE(c1) and REQUEST_LEAVE(c2) at the same time. Is this handled in serial or in parallel?
> 
> 
> I don't think any requests should be sent in this case: the current 
> coordinator should add the LEAVE(s) into its queue, as if it indeed did 
> receive 2 LEAVE requests. This may or may not lead to rebalance, 
> depending on the rebalance policy (e.g. JOINS are queued, but LEAVES and 
> MERGES trigger a rebalance immediately).
Makes sense.
On a side note, I only see a point in having LEAVES policy set to QUEUE (vs immediate) if there's an controlled system shutdown. Otherwise the JOINS should be handled on an immediate bases: that's in order to quickly react to topology node crashes.  So IMO we also need the hooks to switch between IMMEDIATE vs QUEUE policy at runtime.