It then responses with an acknowledgment message, CM then includes the node as the member of the cluster and transitions the state of the node from Init to Alive. Whenever a new node joins, the CM changes the state of the node from Down to Init and broadcasts a "boot-up message", which the node receives the executes set of start-up procedures. Design and implementation Įvery CM on the master server maintains a finite-state machine with three states for each node it administers: Down, Init, and Alive. Since the heartbeat or keepalive messages are the overwhelming majority of non-application related cluster control messages-which also goes to all the members of the cluster-major critical systems also include non- IP protocols like serial ports to deliver heartbeats. Since CMs have transactions across the cluster, the most common pattern is to send heartbeat messages to all the nodes and " await" responses in non-blocking fashion. Heartbeat messages are sent in a periodic manner through techniques such as broadcast or multicasts in larger clusters.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |