Re: [jgroups-users] Flush + tcp Configuration

On 07/08/18 10:52, Questions/problems related to using JGroups wrote:
> Hello,
> 
> Thanks for your answer. You are correct FLUSH isn't the culprit here, 
> tcp.bind_addr is. The original tcp.xml provided by jgroups doesn't use 
> tcp.bind_addr. I added bind_addr=127.0.0.1 to config and now the nodes 
> are finding eachother with or without FLUSH.

OK

> So the way it works is one has to set bind_addr to the same value as in 
> initial_hosts, either both pointing to the Loopback address or both 
> pointig to a real ip adress and not mixing between these two.

Correct. Alternatively, you could use a different (dynamic) discovery 
protocol.

Note that FLUSH is old and (semi-) unsupported; do you really need it? 
What properties do you need from the reliable transport?

> Best regards,
> Thorsten Goetzke
> 
> Am 06.08.18 um 18:02 schrieb Questions/problems related to using JGroups:
>>
>>
>> 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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>>>
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>>
> 
> ------------------------------------------------------------------------------ 
> 
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-- 
Bela Ban | http://www.jgroups.org


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