JGroups Protocol FD SOCK: Difference between revisions
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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 [[JGroups Protocol FD|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 [[JGroups Protocol FD|FD]] and FD_SOCK failure detection protocols. | ||
=Recommendations= | |||
<blockquote style="background-color: #f9f9f9; border: solid thin lightgrey;"> | |||
:[[JGroups Protocol FD_ALL#Recommendations|FD_ALL Recommendations]] | |||
</blockquote> | |||
=Configuration= | =Configuration= | ||
Revision as of 22:38, 1 March 2016
!!!External
- User Manual FD http://www.jgroups.org/manual/index.html#FD_SOCK
- JGroups Wiki http://community.jboss.org/wiki/JGroupsFDSOCK
- http://community.jboss.org/wiki/FDVersusFDSOCK
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.
Recommendations
Configuration
JGroups standalone:
<FD_SOCK start_port="${jboss.jgroups.udp.fd_sock_port:54200}"/>