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.
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