There is no simple answer to this question. It depends on configuration of your cluster and load profile.
Cluster won't stop in any case, because it is designed to support scaling, but the performance could be affected. If you use partitioned caches (default cache configuration) then adding or removing a node triggers partition map exchange, which is basically redistribution of data for the performance sake. This is not stop of the world operation, but if your cluster is under the heavy load then you can see a performance drop. https://cwiki.apache.org/confluence/display/IGNITE/%28Partition+Map%29+Exchange+-+under+the+hood If you use replicated caches, then removing a node only affects throughput, because you have less workers for executing your requests. -- Sent from: http://apache-ignite-users.70518.x6.nabble.com/
