Re: [jgroups-users] RpcDispatcher does not invoke remote method

You need to also be careful if you are using Jgroups in EC2.  The UDP packet limits there are 32k which caused us a lot of pain.  See:

	https://stackoverflow.com/a/20982493/179850

gray

> On Jul 17, 2017, at 09:35, Questions/problems related to using JGroups <[email protected]> wrote:
> 
> Found the problem; actually there were 2...
> 
> 1: a max_bundle_size of 100K exceeds the max datagram packet size allowed by UDP. I added a sanity check to master to throw an exception if this happens.
> 
> 2: FRAG2 is enabled on the main stack, but on none of the fork stacks. If you move FRAG2 below FORK, things will work.
> 
> On 17/07/17 13:22, Questions/problems related to using JGroups wrote:
>> The code provided can be used to reproduce the issue mentioned. All is well
>> until a byte buffer of size 65353 is transferred using fork channel.
>> However, increasing the size by even 1 byte produces the issue (RPC call not
>> invoked). Probably there is some limitation which uses 64k chunks by default
>> (65536 - 65353 = 183). I suppose the deficit 183 bytes are used up by the
>> Message metadata. I initially had this issue when I sent 1MB chunks via RPC.
>> The main channel works well irrespective of the buffer size. If fork
>> channels use the same communication mechanism internally I am wondering why
>> this won't work for fork channels. This cannot be the bundling size since
>> setting  also gives the same result. The jgroups manual nor the
>> https://github.com/belaban/JGroups/blob/master/doc/design/FORK.txt
>> <https://github.com/belaban/JGroups/blob/master/doc/design/FORK.txt>
>> provides any info relating of size limitations while using Fork channels for
>> transport.
>> I am using JGroups 4.0.2. The protocol stack used is
>> --
>> View this message in context: http://jgroups.1086181.n5.nabble.com/jgroups-users-RpcDispatcher-does-not-invoke-remote-method-tp11333p11339.html
>> Sent from the JGroups - General mailing list archive at Nabble.com.
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> 
> -- 
> Bela Ban | http://www.jgroups.org
> 
> 
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