Re: [jgroups-users] FD/FD_SOCK

On 19/06/18 12:19, Questions/problems related to using JGroups wrote:
> Hi all,
> 
> I am reading the documentation of the FD/FD_SOCK protocols but I am unsure about the actual implementation of the FD sock mechanism, the docs say:
> 
> FD
> Failure detection based on a logical ring and heartbeat messages.
> 
> FD_SOCK
> Failure detection protocol based on a ring of TCP sockets created between cluster members, similar to FD but not using heartbeat messages.
> 
> 
> I think I understand how the FD_SOCK protocols works however I don't quite get what network protocols is used to send heartbeat messages by FD.


FD uses the transport that's configured, e.g. TCP or UDP. It does _not_ 
create its own sockets to send and receive heartbeats.

BTW, note that I recommend FD_ALL over FD, google for the reasons (this 
has been discussed before).


> The FD_SOCK seems to suggest it uses TCP, am I right ?

FD_SOCK does indeed create its own TCP socket, yes

> Thanks,
> Pietro
> 
> 
> 
> Pietro Paolini
> Consultant
> 
> Alfa
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-- 
Bela Ban | http://www.jgroups.org


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