oskarryn

'''
spark/bin/spark-submit \
    --master local --driver-memory 4g \
    --num-executors 2 --executor-memory 4g \
    --packages org.apache.spark:spark-sql-kafka-0-10_2.11:2.4.0 \
    sstreaming-spark-out.py
'''
from pyspark.sql import SparkSession
from pyspark.sql.types import *

oskarryn

'''
spark/bin/spark-submit \
    --master local --driver-memory 4g \
    --num-executors 2 --executor-memory 4g \
    --packages org.apache.spark:spark-sql-kafka-0-10_2.11:2.4.0 \
    sstreaming-spark-final.py
'''
from pyspark.sql import SparkSession
from pyspark.sql.types import *
from pyspark.sql.functions import expr

oskarryn

from scipy.stats import skewnorm
import numpy as np

from pyspark.sql import SparkSession
spark = SparkSession.builder.getOrCreate()

def generate_cycle_randomly(unit_id, cycle, model_variant, label):
    temp = 50+skewnorm.rvs(-8, size=1).item() + np.random.normal(0, 5)
    pressure = np.random.uniform(900,1200) + np.random.normal(0, 50)
    return (unit_id, cycle, model_variant, round(temp, 2), round(pressure, 2), label)

oskarryn

def parse_data_from_kafka_message(sdf, schema):
    """Extract data from kafka message's value and specify schema

    Parameters
    ----------    
    sdf : pyspark.sql.DataFrame
        DataFrame obtained from Kafka stream, for which df.isStreaming is True
    schema : OrderedDict or pyspark.sql.types.StructType
        Dictionary that preserves order, containing columns' names as keys and data types as values.
        Alternatively, pyspark.sql.types.StructType could define schema.