StateConsumerImpl.isKeyUpdated searches for the key in the values collection ---------------------------------------------------------------------------- Key: ISPN-4036 URL: https://issues.jboss.org/browse/ISPN-4036 Project: Infinispan Issue Type: Bug Components: Core, State Transfer Affects Versions: 6.0.1.Final Reporter: Dan Berindei Assignee: Dan Berindei Priority: Critical Fix For: 7.0.0.Alpha1 Introduced by the ISPN-3443 fix. I changed the {{updatedKeys}} HashSet to be an EquivalendConcurrentHashMap, but I forgot to change the {{contains(key)}} call to {{containsKey(key)}}. Since we use the same value for all the keys, it means state transfer might skip more keys than it should have.