akka/akka — pull request #787 by patriknw (2012-10-08 06:48:08+00:00)
Title: Use consistent hash to heartbeat to a few nodes instead of all, see #2284

* Previously heartbeat messages was sent to all other members, i.e.
each member was monitored by all other members in the cluster.
* This was the number one know scalability bottleneck, due to the
number of interconnections.
* Limit sending of heartbeats to a few (5) members. Select and
re-balance with consistent hashing algorithm when new members
are added or removed.
* Send a few EndHeartbeat when ending send of Heartbeat messages.