Since version 4.1, whenever Infinispan needs to print byte arrays to logs, these are partially printed in order to avoid unnecessarily printing potentially big byte arrays. This happens in situations where either, Infinispan caches have been configured with lazy deserialization, or your running an Memcached or Hot Rod server. So in these cases, only the first 10 positions of the byte array are shown in the logs. If you want Infinispan to show the full byte array in the logs, simply pass the -Dinfinispan.arrays.debug=true system property at startup. In the future, this might be controllable at runtime via a JMX call or similar.
Here's an example of log message with a partially displayed byte array:
And here's a log message where the full byte array is shown: