JGroups Protocol FD SOCK: Difference between revisions
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!!!External | |||
* JGroups Wiki http://community.jboss.org/wiki/JGroupsFDSOCK | |||
* http://community.jboss.org/wiki/FDVersusFDSOCK | |||
=Internal= | =Internal= | ||
* [[JGroups#Protocols|JGroups]] | * [[JGroups#Protocols|JGroups]] | ||
!!!Overview | |||
Failure detection protocol based on a ring of TCP sockets created between group members. Each member in a group connects to its neighbor. Last member connects to first, thus forming a ring. Member B is suspected when its neighbor A detects abnormally closed TCP socket presumably due to a node B crash. However, if a member B is about to leave gracefully, it lets its neighbor A know, so that it does not become suspected. | |||
One FD_SOCK disadvantage is that hung servers and/or crashed switches will not cause sockets to be closed. Therefore hung members will not be suspected and network partitions due to switch failures will not be detected. A solution to this problem is to use both FD and FD_SOCK failure detection protocols. | |||
!!!Configuration Sample | |||
{{{ | |||
<FD_SOCK start_port="${jboss.jgroups.udp.fd_sock_port:54200}"/> | |||
}}} | |||
!!!Recommendations | |||
See [FD_ALL Recommendations|FD_ALL#Recommendations] | |||
__Referenced by:__\\ | |||
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Revision as of 22:33, 1 March 2016
!!!External
- JGroups Wiki http://community.jboss.org/wiki/JGroupsFDSOCK
- http://community.jboss.org/wiki/FDVersusFDSOCK
Internal
!!!Overview
Failure detection protocol based on a ring of TCP sockets created between group members. Each member in a group connects to its neighbor. Last member connects to first, thus forming a ring. Member B is suspected when its neighbor A detects abnormally closed TCP socket presumably due to a node B crash. However, if a member B is about to leave gracefully, it lets its neighbor A know, so that it does not become suspected.
One FD_SOCK disadvantage is that hung servers and/or crashed switches will not cause sockets to be closed. Therefore hung members will not be suspected and network partitions due to switch failures will not be detected. A solution to this problem is to use both FD and FD_SOCK failure detection protocols.
!!!Configuration Sample
{{{
<FD_SOCK start_port="${jboss.jgroups.udp.fd_sock_port:54200}"/>
}}}
!!!Recommendations
See [FD_ALL Recommendations|FD_ALL#Recommendations]
__Referenced by:__\\
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