Re: [jgroups-users] FD/FD_SOCK

On 19/06/18 16:59, Questions/problems related to using JGroups wrote:
> Hi Bela,
> 
> Thanks a lot.
> 
> On a different note, I am struggling to find information about how the protocols JGroups provide can be bundled up together, what is
> allowed and what it is not. I couldn't find anything online which states what makes a stack valid.

Best practice is to copy one of the sample configuration files, e.g. 
udp.xml or tcp.xml / tcp_nio.xml, and make minor modifications (e.g. 
bind addresses, ports etc).

> I apologise if such info was around and I couldn't find it, I wouldn't be surprised if this was the 10E(10E)+ you were asked such question...
> 
> For instance, can I have two discovery protocols in my stack ?
> 
> <TCP ...>
> <MPING ... >
> <JDBC_PING>
> 
> Is that "legal" ? Is there any piece of documentations which you reckon I could find useful ?

Yes, you can have multiple discovery protocols: 
www.jgroups.org/manual4/index.html#_multi_ping


> Thanks,
> P.
> 
> 
> 
> 
> 
>> -----Original Message-----
>> From: Questions/problems related to using JGroups [mailto:javagroups-
>> [email protected]]
>> Sent: 19 June 2018 13:38
>> To: [email protected]
>> Subject: 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
>>> ________________________________
>>> e: [email protected] | w:
>> alfasystems.com<https://www.alfasystems.com>
>>> t: +44 (0) 20 7920-2643 | Moor Place, 1 Fore Street Avenue, London, EC2Y
>> 9DT, GB
>>> ________________________________
>>>
>>> The contents of this communication are not intended to be binding or
>> constitute any form of offer or acceptance or give rise to any legal obligations
>> on behalf of the sender or Alfa. The views or opinions expressed represent
>> those of the author and not necessarily those of Alfa. This email and any
>> attachments are strictly confidential and are intended solely for use by the
>> individual or entity to whom it is addressed. If you are not the addressee (or
>> responsible for delivery of the message to the addressee) you may not copy,
>> forward, disclose or use any part of the message or its attachments. At
>> present the integrity of email across the internet cannot be guaranteed and
>> messages sent via this medium are potentially at risk. All liability is excluded
>> to the extent permitted by law for any claims arising as a result of the use of
>> this medium to transmit information by or to Alfa or its affiliates.
>>>
>>> Alfa Financial Software Ltd
>>> Reg. in England No: 0248 2325
>>>
>>> ------------------------------------------------------------------------------
>>> Check out the vibrant tech community on one of the world's most
>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>>> _______________________________________________
>>> javagroups-users mailing list
>>> [email protected]
>>> https://lists.sourceforge.net/lists/listinfo/javagroups-users
>>>
>>
>> --
>> Bela Ban | http://www.jgroups.org
>>
>>
>> ------------------------------------------------------------------------------
>> Check out the vibrant tech community on one of the world's most
>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>> _______________________________________________
>> javagroups-users mailing list
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/javagroups-users
> 
> ------------------------------------------------------------------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> _______________________________________________
> javagroups-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/javagroups-users
> 

-- 
Bela Ban | http://www.jgroups.org


------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot