def define_context():
conf = SparkConf().setMaster("local[*]").setAppName(
"twitter-artist-count").set("spark.cassandra.connection.host",
"127.0.0.1")
sc = CassandraSparkContext.getOrCreate(conf=conf)
sc.setCheckpointDir("./checkpoints")
ssc = StreamingContext(sc, 30)
return ssc
