Read Nested JSON Data in DStrem in pyspark

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I have written following code to stream data from Tweepy API. And I am getting data inside stream object. But unable to get streamp["user"]["followers_count"] but don't know how to get it. I also tried jsonLines = lines.flatMap(lambda json_str:json.loads(json_str)) but no help.

from __future__ import print_function
from pyspark import SparkContext
from pyspark.streaming import StreamingContext
import json

sc = SparkContext()
ssc = StreamingContext(sc, 10) #Slide Interval of 10 sec

socket_stream = ssc.socketTextStream("localhost",4444)

stream = socket_stream.window(30) #window length 30 sec
stream.pprint()

ssc.start()
ssc.awaitTermination()

stream.pprint() gives me following JSON.

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I am new to spark and already spent 3 days finding out how to get value from Nested JSON Inside DStream Object.

1

There are 1 answers

0
werner On BEST ANSWER

You can map the json string to a tuple of the values that you want to extract:

import json
def parse_json_string(str):
    user = json.loads(str)["user"]
    return (user["name"], user["followers_count"])

stream = socket_stream.window...

stream = stream.map(lambda str: parse_json_string(str))

stream.pprint()

ssc.start()
ssc.awaitTermination()

Output:

-------------------------------------------                                     
Time: 2021-05-08 18:50:48
-------------------------------------------
('Nahoj Morts', 15)
('KISSMEMYFAN1106♡', 91307)
('om_mhamd99', 903)
('', 100)