[infinispan-dev] Default TCP configuration is broken.

[Bela Ban]

Note that FRAG3 is relatively recent...

On 22/02/17 21:01, Dan Berindei wrote:
> +1 to add FRAG3 back in, with frag_size="200k" to make fragmentation
> less likely, yet stay under max_credits * min_threshold.
>
> Dan
>
> On Wed, Feb 22, 2017 at 9:41 PM, Alan Field <afield at redhat.com> wrote:
>>
>>
>> ----- Original Message -----
>>> From: "Pedro Ruivo" <pedro at infinispan.org>
>>> To: "ispn-dev" <infinispan-dev at lists.jboss.org>
>>> Sent: Wednesday, February 22, 2017 9:59:21 AM
>>> Subject: [infinispan-dev] Default TCP configuration is broken.
>>>
>>> Hi team,
>>>
>>> The 'default-jgroups-tcp.xml" has MFC protocol without the FRAG2/3
>>> protocol. This is broken when we send a multicast message larger than
>>> 'max-credits'. It will block forever in MFC [1]. No timeouts since we
>>> don't have the CompletableFuture at this point.
>>>
>>> Possible solutions are:
>>>
>>> #1 put back FRAG2/3
>>>
>>> advantage: we have multicast flow control.
>>> disadvantage: all messages are fragmented (unicast and multicast), that
>>> probably requires more resources (more messages in NAKACK and UNICAST
>>> tables?)
>>
>> This is my preferred solution, since removing MFC did not work for me!
>>
>> Thanks,
>> Alan
>>
>>>
>>> #2 remove MFC
>>>
>>> advantage: probably low resources usages. TCP will handle any fragmentation.
>>> disadvantage: we don't have multicast flow control.
>>>
>>> #3 alternative?
>>>
>>> Cheers,
>>> Pedro
>>>
>>> [1] actually, I need a thread dump to confirm it.
>>> _______________________________________________
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>>>
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-- 
Bela Ban, JGroups lead (http://www.jgroups.org)