Hello! If you would read on the Rendezvous algorithm you will notice that it is essentially random-based. Balanced distribution is only attained by having a large number of partitions, which would even-out the randomness.
Also, if all of your partitions map to the same nodes, you should check your cluster's baseline (if running with persistence). It is possible that not all nodes are in baseline. Regards, -- Ilya Kasnacheev 2018-08-23 12:14 GMT+03:00 kotamrajuyashasvi <[email protected]>: > Hi > > I'm working on an Ignite project where all the data is partitioned based on > field partition-id and it is set > as affinitykeyfield. We are running 5 ignite servers on 5 machines which > have identical hardware and ignite heap settings/java options. Our data has > overall 5 partition-ids(1-5) . But when we insert same number of records > for > each partition id the data is not spreading equally among all ignite > servers. For example when we insert 5 records of each with partition id 1-5 > , Its expected that each server node has one record. But the distribution > is > different. I used Affinity.mapPartitionToNode() function to see how > partitions are mapped to nodes and we see the following mapping: > > partiton-id : 1 [192.168.10.155] > partiton-id : 2 [192.168.10.155] > partiton-id : 3 [192.168.10.155] > partiton-id : 4 [192.168.10.153] > partiton-id : 5 [192.168.10.155] > > And our ignite server nodes are : > 1. 192.168.10.152 > 2. 192.168.10.153 > 3. 192.168.10.154 > 4. 192.168.10.155 > 5. 192.168.10.157 > > We even changed the number of partitions as 5 using > RendezvousAffinityFunction > But still the partition to node mapping was exactly same as without > RendezvousAffinityFunction(the above mapping). > > Our data is almost evenly distributed among the partition ids hence we > require even partition to node distribution. How can we achieve that ? We > do > not want to mess with any ignite default properties except the partition to > node mapping. We will also be using backups. Also why is the default > partition to node mapping not balanced ? > > > > > > -- > Sent from: http://apache-ignite-users.70518.x6.nabble.com/ >
