Re: [jgroups-users] Flush + tcp Configuration

On 03/08/18 17:21, Questions/problems related to using JGroups wrote:
> Hello,
> 
> I am currently trying to get Jgroups running reliable using the tcp 
> protocol. Now here is a problem that i ran into:
> Initially we used the tcp.xml provided by jgroups (assuming that that 
> config would be a good starting point) and added pbcast.FLUSH.
> That actually didn't work. I ran the ReplicatedHasMapDemo on this config 
> using 2 clients on port 7800 and 7801 respectively. The title for both 
> clients stayed at 1 Server(s), so the Demo didn't work


Using FLUSH or not should not make a diff in discovery; make sure that 
'localhost' maps to 127.0.0.1 (as you set your bind address to it), and 
also verify jgroups.tcp.bind_port maps to 7800 and 7801, respectively.

By just adding FLUSH, you probably had a mismatch between 
TCP.bind_addr/bind_port and TCPPING.initial_hosts


> Than I wrote the config below and the Demo did work.
> So i am currently somewhat lost. Is this behavior a bug, was the 
> configuration just wrong, is my new configuration any good...
> 
> I tried to find some information online, apperently once apon a time a 
> tcp-flush.xml existed but it got removed(?) There seems to be some 
> information on javagroups-cvs but thats private(?)
> 
> Our Usecase: A very small amount of servers publishing their state, 
> little traffic but reliablity (especially when servers are 
> unplugged/rebooted) is pretty important.
> 
> Best Regards,
> Thorsten Goetzke
> 
> <config xmlns="urn:org:jgroups"
>          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>          xsi:schemaLocation="urn:org:jgroups 
> http://www.jgroups.org/schema/jgroups.xsd">
> 
> <TCP
>          bind_addr="127.0.0.1"
>          bind_port="${jgroups.tcp.bind_port}"
> />
> 
> <!-- it is recommended to add all the hosts on which members of the 
> cluster will be running to the configuration. -->
> <TCPPING async_discovery="true"
> 
> initial_hosts="${jgroups.tcpping.initial_hosts:localhost[7800],localhost[7801],localhost[7802]}" 
> 
>           port_range="0"/>
> 
> <MERGE3 />
> <FD_SOCK/>
> <FD/>
> <VERIFY_SUSPECT/>
> <BARRIER/>
> <pbcast.NAKACK2 />
> <UNICAST3 />
> <pbcast.STABLE />
> <pbcast.GMS />
> <MFC/>
> <FRAG2 />
> <RSVP />
> <pbcast.STATE_TRANSFER/>
> <pbcast.FLUSH/>
> </config>
> 
> 
> 
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-- 
Bela Ban | http://www.jgroups.org


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