jgroups VIEW_SYNC and GMS

[freeliuade]

Hi, I'm using jgroups 2.12.1.final

I'm confuse use VIEW_SYNC or GMS or both

in https://community.jboss.org/wiki/JGroupsVIEWSYNC , VIEW_SYNC is not recommand in 2.9 or later.

while in jgroups manual and jboss7 (which is bind 2.12.1.final) http://www.jgroups.org/manual/html/user-channel.html#d0e1351

view_sync and GMS are used both.

so my question is:

which one use be use, is it safy to use both of them?

[rhusar]

Not exactly right. To correct this:

JBoss AS 7 is using 3.x generation of JGroups (i.e. AS 7.2 is going to use JG version 3.2.6.Final or later).

Moreover AS 7 does not use VIEW_SYNC, check the stack configuration: https://github.com/jbossas/jboss-as/blob/master/clustering/jgroups/src/main/resources/jgroups-defaults.xml

The documentation (community.jboss.org) is correct. Don't use VIEW_SYNC in newer versions, stick with GMS.

[freeliuade]

Hi,

appriciate for your comments.

... now my product already used both (VIEW_SYNC + GMS) and the product has been released out.

Is there any side effect if used both?

[rhusar]

What version of JGroups is this?

Is there any side effect if used both?

My rough guess is that is not a problem. All this does, is exchange membership information every 60 seconds (or whatever you have configured) which generally just adds a little overhead but should not cause any issues. If it works and passed testing, I wouldn't worry about it.

[freeliuade]

got it, thanks very much!