Good afternoon,

I've been using the Publish/Subscribe Context Broker - Orion Context Broker
for my master thesis, and I'm using the Fiware Lab (Global Instance -
http://orion.lab.fiware.org:1026).

I've been doing some experiments on it and recording some useful metrics .
The experiment is publishing 20000 entities in parallel (from 50 to 500
requests always active, until there are no more entities to publish) and I
also have a subscriber that receives all these entities updates.

I publish this data 9 times per day (3 times in the morning (from 9h30 to
12h30 GMT), 3 in the afternoon (from 15h30 to 18h30 GMT) and 3 in the
evening (21h30 to 00h30 GMT), and I noticed that the number of retries I
see in the application (responses with status 503 or TCP RST flag being
sent) grows steady throughout the day.

To try out some hypotheses I published the same data during 2 consecutive
days (using the same formula). I have attached some images with a box plot
for each day showing the number of retries.

The retries grow throughout the day, but in the following one they start
low again. Could you tell me if this is some kind of memory leak and the
machine is being restarted at dawn (somewhere between 00h30 and 9h30 GMT),
or is it due to something else? This would be incredibily useful to my
thesis.

I have already asked this same question once, but I got answered that I
should deploy my own Orion instance. The thing is that it is vital that I
don't have access to the broker nor can I control it in any way, because my
tool is aimed at testing the performance in an production environment
therefore the Fiware Lab Global Instance fits like a glove in my tests. So
if I could get an answer I would be incredibly thankful.

Thanks,
João Cardoso

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