[jboss-jira] [JBoss JIRA] Resolved: (JGRP-395) Parallel FD

[Bela Ban (JIRA)]

     [ http://jira.jboss.com/jira/browse/JGRP-395?page=all ]

Bela Ban resolved JGRP-395.
---------------------------

    Resolution: Done

The protocol is called FD_ALL. Docu is available at http://www.jgroups.org/javagroupsnew/docs/manual/html/index.html

> Parallel FD
> -----------
>
>                 Key: JGRP-395
>                 URL: http://jira.jboss.com/jira/browse/JGRP-395
>             Project: JGroups
>          Issue Type: Feature Request
>    Affects Versions: 2.4
>            Reporter: Bela Ban
>         Assigned To: Bela Ban
>             Fix For: 2.5
>
>
> With FD, when we have N nodes in a cluster and the switch crashes, every node will take roughly (N-1) * TIMEOUT ms to become a singleton cluster. This is because in regular FD, we only ping the next-in-line, e.g.
> - Cluster is A, B, C, D
> - The plug is pulled
> - Example B:
> - B decides that, after TIMEOUT ms, C is dead and excludes C from the pingable members
> - B then starts emitting a SUSPECT(C) until it gets a new view which excludes C
> - B switches to pinging D
> - After TIMEOUT ms, it switches to A
> - When all of C, D and A have been excluded, B decides to become a singleton cluster (and coordinator in it)
> SOLUTION:
> - Nodes don't actively ping other nodes. Instead, each nodes periodically multicasts a HEARTBEAT to the cluster
> - The HEARTBEAT is suppressed when a node sends data, because data counts as a heartbeat as well
> - Every node maintains a table of nodes and the last time we received either a message or a HEARTBEAT from that node
> - The counter is updated with the current time whenever that is the case
> - Periodically, we check whether any node has not sent us data/heartbeat for more the timeout ms. If so, we suspect it

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