The length of time a management node waits for a heartbeat message from another management node is now configurable using the HeartbeatIntervalMgmdMgmd management node configuration parameter added in this release. The connection is considered dead after 3 missed heartbeats. The default value is 1500 milliseconds, or a timeout of approximately 6000 ms. (Bug #17807768, Bug #16426805)

NDB Cluster APIs: Trying to access old rows while using role=ndb-caching after restarting the memached daemon caused the daemon to crash.

The current fix prevents the crash in such cases but does not provide full support for role=ndb-caching. (Bug #16204844)