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Question by Will Wright · Jul 28, 2016 at 09:46 AM · upaopaque

Opaque message size limitations

What factors influence the maximum size of an opaque message that can sucessfully pass through the TREP platform?

Using infrastructure ADS/ADH v3.0.2 and client UPA/ETA v3.0.0.L1. I was able to sustainably publish and subscribe to 256kb objects, but things ground to a halt witha 4mb object and things had to be restarted to recover e.g. in the ADS log file "Suspended requests due to transport congestion."

I appreciate that pushing large quantities of raw data through the platform probably isn't going to be particularly efficient and there may well be likely more suitable solutions, but I am interested in the realistic capabilities and limitations of using TREP for passing opaque binary objects around.

Gordon Hunn
kim.valentine

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Answer by david.mazeska · Aug 02, 2016 at 04:20 PM

So right now the max message size is 64k across the backbone. It does sometime work with larger messages but we've found some issues with the code recently that prevents this from working 100% of the time.

In addition, you would need to set the *numBuffers : 10000 or something much higher than the default of 190. This is the main reason ADS might lock up if sending large messages as it will run out of buffers attempting to reassemble.

We have been working on resolving this limitation and hope to get this fixed in a subsequent release.

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Gordon Hunn
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Answer by jirapongse.phuriphanvichai · Jul 29, 2016 at 04:42 AM

You may try to increase the number of output buffers in ADS.

*ads*maxOutputBuffers
*ads*guaranteedOutputBuffers
*ads*poolSize

The buffer size of RSSL is 6144 bytes and the default value of guaranteedOutputBuffers is 200. Therefore, its size is 6144 * 200 = 1,228,800 bytes which is less than 4MB object.


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