On Oct 31, 2013, at 3:45 PM, Dennis Reed <[email protected]> wrote: > On 10/31/2013 02:18 AM, Bela Ban wrote: >> >>> Also if we did have read only, what criteria would cause those nodes >>> to be writeable again? >> Once you become the primary partition, e.g. when a view is received >> where view.size() >= N where N is a predefined threshold. Can be >> different, as long as it is deterministic. >> >>> There is no guarantee when the other nodes >>> will ever come back up or if there will ever be additional ones anytime >>> soon. >> If a system picks the Primary Partition approach, then it can become >> completely inaccessible (read-only). In this case, I envisage that a >> sysadmin will be notified, who can then start additional nodes for the >> system to acquire primary partition and become accessible again. > > There should be a way to manually modify the primary partition status. > So if the admin knows the nodes will never return, they can manually > enable the partition.
The status will be exposed through JMX at any point, disregarding if there's a split brain going on or not. > > Also, the PartitionContext should know whether the nodes left normally > or not. > If you have 5 nodes in a cluster, and you shut down 3 of them, you'll > want the remaining two to remain available. > But if there was a network partition, you wouldn't. So it needs to know > the difference. very good point again. Thank you Dennis! Cheers, -- Mircea Markus Infinispan lead (www.infinispan.org) _______________________________________________ infinispan-dev mailing list [email protected] https://lists.jboss.org/mailman/listinfo/infinispan-dev
