Created question in FIWARE Q/A platform on 09-06-2018 at 13:06
Please, ANSWER this question AT https://ask.fiware.org/question/1002/strange-comet-issues/

Question:
Strange Comet issues

Description:
Dear Fiware,

I am trying to connect STH Comet to Orion in order to aggregate some events.

However I am having some errors:

In order to reproduce this errors for you to analyze, I have created this small project that isolates Orion and STH Comet, and reproduces the error in the log messages: https://github.com/PedroD/comet_demo

When you run it, you will find log messages.

These log messages contain all commands that the coordinator app sends to Orion and STH Comet, so that you don't need to worry about the Kotlin project's source.

In sum, the issues we are having are:

1) Comet is, for some reason, overflowing like this:

sth_1 | time=2018-06-09T11:04:02.626Z | lvl=WARN | corr=n/a | trans=n/a | op=OPER_STH_DB_LOG | from=n/a | srv=n/a | subsrv=n/a | comp=STH | msg=The size in bytes of the namespace for storing the aggregated data ("sth_sensei_service" plus "sth_/sensei,/sensei,/sensei,/sensei,/sensei,/sensei,/sensei,/sensei,/sensei,/sensei_PersonDetection_PersonDetection.aggr", 138 bytes) is bigger than 120 bytes

2) Comet is for some reason, having issues persisting some data in mongo, despite that the coordinator only tries to register the entities once:

sth_1 | time=2018-06-09T11:04:12.870Z | lvl=ERROR | corr=d78056a4-6bd4-11e8-97dd-0242ac120005 | trans=745ad73e-ebd0-49a4-b843-261981c8f9b2 | op=OPER_STH_POST | from=n/a | srv=sensei_service | subsrv=/sensei | comp=STH | msg=Error when getting the raw data collection for storing:MongoError: a collection 'sth_sensei_service.sth_/sensei_PersonDetection_PersonDetection' already exists

3) When asked for aggregations, using the url below, Comet returns empty values:

URL: http://sth:8666/STH/v1/contextEntities/type/PersonDetection/id/PersonDetection/attributes/positionX?aggrMethod=sum&aggrPeriod=second&dateFrom=2016-02-01T00:00:00.000Z&dateTo=2019-01-01T23:59:59.999Z

demo_1 | Requesting aggregation to Comet:
demo_1 | {"contextResponses":[{"contextElement":{"attributes":[

],"id":"PersonDetection","isPattern":false,"type":"PersonDetection"},"statusCode":{"code":"200","reasonPhrase":"OK"}}]}
demo_1 |
demo_1 | Comet seems to be sending an empty "values" array. What is going on?
demo_1 |

What is going on? How can we solve these issues?

Thanks!