Fiware Draco - Subscription works only for the first payload. Only the first payload is saved in historical mongodb - subscription

Question

I am trying to save historical context data in Mongo, but without success. Only the first payload sent to Draco is saved to MongoDB for historical data, but Mongo does not react to attribute updates.
Versions used for the test: Orion-LD version 0.8.0, Mongo version 4.4, Draco version 1.3.6.
I tested it also with the 3.4 version of Mongo and the behavior is the same.
Can you, please, help me to fix a problem?
Below are the steps I performed:
Create a Draco subscription:
curl --location --request POST 'http://localhost:1026/v2/subscriptions' \
--header 'Fiware-Service: test' \
--header 'Fiware-ServicePath: /openiot' \
--header 'Content-Type: application/json' \
--data-raw '{
"description": "Notify Draco of all context changes",
"subject": {
"entities": [
{
"idPattern": ".*"
}
]
},
"notification": {
"http": {
"url": "http://10.0.0.5:5050/v2/notify"
}
},
"throttling": 0
}'
Create an entity:
curl --location --request POST 'http://localhost:1026/v2/entities' \
--header 'Fiware-Service: test' \
--header 'Fiware-ServicePath: /openiot' \
--header 'Content-Type: application/json' \
--data-raw ' {
"id":"urn:ngsi-ld:Product:0102", "type":"Product",
"name":{"type":"Text", "value":"Lemonade"},
"size":{"type":"Text", "value": "S"},
"price":{"type":"Integer", "value": 99}
}'
Overwrite the value of an attribute value:
curl --location --request PUT 'http://localhost:1026/v2/entities/urn:ngsi-ld:Product:0102/attrs' \
--header 'Fiware-Service: test' \
--header 'Fiware-ServicePath: /openiot' \
--header 'Content-Type: application/json' \
--data-raw '{
"price":{"type":"Integer", "value": 110}
}'
LISTEN_HTTP PROCESSOR:
LISTEN_HTTP
NGSITOMONGO PROCESSOR:NGSITOMONGO
Template: Template
MongoDB: mongo

Answer 1

We do not use that precise stack, but we have got many production deployments keeping context historical data on MongoDb by using FIWARE Orion (v2 API) with FIWARE Cygnus (NGSIMongo Sink for historical raw data, and NGSISTH Sink for aggregated data at MongoDB).
https://github.com/telefonicaid/fiware-cygnus/blob/master/doc/cygnus-ngsi/flume_extensions_catalogue/ngsi_mongo_sink.md
https://github.com/telefonicaid/fiware-cygnus/blob/master/doc/cygnus-ngsi/flume_extensions_catalogue/ngsi_sth_sink.md
Maybe this help.

Answer 2

In the new version of Draco 2.1.0 this bug is fixed. You can check the code in the official repository. The release link is https://github.com/ging/fiware-draco/releases/tag/2.1.0
Additionally, you can use the docker image available for this release by pulling it using docker pull ging/fiware-draco:2.1.0.
You can also use the Mongo-Tutorial template available inside of Draco where you have preconfigured the processors needed to persist in MongoDB.
One thing that you have to consider is that the new version of Draco is aligned with the 1.15.3 version of NiFi in where you need first to log in for access to the Web UI using the default credentials (user: admin, password: pass1234567890). You can check the official documentation for more information about it https://fiware-draco.readthedocs.io/en/latest/