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I have a simple JSON object like the following

d = { 'tag ': 'blah',
  'name' : 'sam',
  'score': 
    {'row1': 100,
      'row2': 200
     }
}

The following is my python code which is sending messages to Kafka

from kafka import SimpleProducer, KafkaClient
import json 

# To send messages synchronously
kafka = KafkaClient('10.20.30.12:9092')
producer = SimpleProducer(kafka)
jd = json.dumps(d)
producer.send_messages(b'message1',jd)

I see in the storm logs that the message is being received but its throwing Transformation null for tuple { json structure in here } not sure what needs to be done in order to fix this ?..

Answers

The below is my code for producer to kafka. The only thing i did differently was to use yaml.safe_load to load the json content. It returns the contents as strings instead of unicode. The following is the snippet

with open('smaller_test_prod.txt') as f:
    for line in f:
        d = yaml.safe_load(line)
        jd = json.dumps(d)
        producer.send_messages(b'zeus_metrics',jd)

In here every line is a json data stored in a file.