JGroups Protocol FD SOCK: Difference between revisions

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* [[JGroups#Protocols|JGroups]]
* [[JGroups#Protocols|JGroups]]


=Overview=


!!!Overview
FD_SOCK implements a 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.


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.


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=


!!!Configuration Sample
JGroups Standalone:


{{{
<pre>


     <FD_SOCK start_port="${jboss.jgroups.udp.fd_sock_port:54200}"/>
     <FD_SOCK start_port="${jboss.jgroups.udp.fd_sock_port:54200}"/>


}}}
</pre>


!!!Recommendations
!!!Recommendations

Revision as of 22:35, 1 March 2016

!!!External

Internal

Overview

FD_SOCK implements a 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

JGroups Standalone: 


    <FD_SOCK start_port="${jboss.jgroups.udp.fd_sock_port:54200}"/>

!!!Recommendations

See [FD_ALL Recommendations|FD_ALL#Recommendations]


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