[infinispan-issues] [JBoss JIRA] (ISPN-3244) TopologyAwareSyncConsistentHashFactory should limit the number of segments per node

TopologyAwareSyncConsistentHashFactory should limit the number of segments per node ----------------------------------------------------------------------------------- Key: ISPN-3244 URL: https://issues.jboss.org/browse/ISPN-3244 Project: Infinispan Issue Type: Bug Components: State Transfer Affects Versions: 5.2.6.Final, 5.3.0.CR2 Reporter: Dan Berindei Assignee: Dan Berindei Fix For: 7.0.0.Alpha2 Let's say we have a cluster with 5 nodes: A(r1), B(r2), C(r2), D(r3), E(r3) TopologyAwareConsistentSyncHashFactory will spread the segments equally on each rack, meaning A will own 2x segments compared to the other nodes. TopologyAwareConsistentHashFactory limits the maximum number per node, so that A owns just as many segments as the other nodes. With a slight limitation: the number of racks must be greater than numOwners, otherwise each rack must hold (at least) one copy of all the data. TopologyAwareConsistentSyncHashFactory is a little random, so we can't distribute the data perfectly, but we can limit the number of segments on each node to something like 1.5x the average number of segments.