Shared memory layout has changed. The default Config#sharedMemory.key has changed to 0xA8000000 so old client applications do not mix shared memory with new client applications. If you are using shared memory clients with a custom shared memory key, it's critical that you change the key when upgrading to this version.
Support scan/query consistency validation using cluster key. Set failOnClusterChange to true in ScanPolicy/QueryPolicy to enable this validation. (Requires Aerospike Server v4.2 or later.) #260