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# Purpose: Streaming read from Kafka topic and aggregate | |
# sales and orders by country to Kafka every minute | |
# Author: Gary A. Stafford | |
# Date: 2021-09-08 | |
import os | |
import boto3 | |
import pyspark.sql.functions as F | |
from ec2_metadata import ec2_metadata | |
from pyspark.sql import SparkSession | |
from pyspark.sql.types import StructField, StructType, IntegerType, | |
StringType, FloatType, TimestampType | |
topic_input = "pagila.sales.spark.streaming.in" | |
topic_output = "pagila.sales.spark.streaming.out" | |
os.environ['AWS_DEFAULT_REGION'] = ec2_metadata.region | |
ssm_client = boto3.client("ssm") | |
def main(): | |
params = get_parameters() | |
spark = SparkSession \ | |
.builder \ | |
.appName("kafka-streaming-sales-kafka") \ | |
.getOrCreate() | |
df_sales = read_from_kafka(spark, params) | |
summarize_sales(params, df_sales) | |
def read_from_kafka(spark, params): | |
options_read = { | |
"kafka.bootstrap.servers": | |
params["kafka_servers"], | |
"subscribe": | |
topic_input, | |
"startingOffsets": | |
"earliest", | |
"kafka.ssl.truststore.location": | |
"/tmp/kafka.client.truststore.jks", | |
"kafka.security.protocol": | |
"SASL_SSL", | |
"kafka.sasl.mechanism": | |
"AWS_MSK_IAM", | |
"kafka.sasl.jaas.config": | |
"software.amazon.msk.auth.iam.IAMLoginModule required;", | |
"kafka.sasl.client.callback.handler.class": | |
"software.amazon.msk.auth.iam.IAMClientCallbackHandler" | |
} | |
df_sales = spark.readStream \ | |
.format("kafka") \ | |
.options(**options_read) \ | |
.load() | |
return df_sales | |
def summarize_sales(params, df_sales): | |
options_write = { | |
"kafka.bootstrap.servers": | |
params["kafka_servers"], | |
"topic": | |
topic_output, | |
"kafka.ssl.truststore.location": | |
"/tmp/kafka.client.truststore.jks", | |
"kafka.security.protocol": | |
"SASL_SSL", | |
"kafka.sasl.mechanism": | |
"AWS_MSK_IAM", | |
"kafka.sasl.jaas.config": | |
"software.amazon.msk.auth.iam.IAMLoginModule required;", | |
"kafka.sasl.client.callback.handler.class": | |
"software.amazon.msk.auth.iam.IAMClientCallbackHandler", | |
} | |
schema = StructType([ | |
StructField("payment_id", IntegerType(), False), | |
StructField("customer_id", IntegerType(), False), | |
StructField("amount", FloatType(), False), | |
StructField("payment_date", TimestampType(), False), | |
StructField("city", StringType(), True), | |
StructField("district", StringType(), True), | |
StructField("country", StringType(), False), | |
]) | |
ds_sales = df_sales \ | |
.selectExpr("CAST(value AS STRING)") \ | |
.select(F.from_json("value", schema=schema).alias("data")) \ | |
.select("data.*") \ | |
.groupBy("country") \ | |
.agg(F.count("amount"), F.sum("amount")) \ | |
.orderBy(F.col("sum(amount)").desc()) \ | |
.select(F.sha1("country").alias("id"), | |
"country", | |
(F.format_number(F.col("sum(amount)"), 2)).alias("sales"), | |
(F.col("count(amount)")).alias("orders")) \ | |
.coalesce(1) \ | |
.selectExpr("CAST(id AS STRING) AS key", "to_json(struct(*)) AS value") \ | |
.writeStream \ | |
.trigger(processingTime="1 minute") \ | |
.queryName("streaming_to_kafka") \ | |
.outputMode("complete") \ | |
.format("kafka") \ | |
.options(**options_write) \ | |
.option("checkpointLocation", "/checkpoint/kafka/") \ | |
.start() | |
ds_sales.awaitTermination() | |
def get_parameters(): | |
"""Load parameter values from AWS Systems Manager (SSM) Parameter Store""" | |
params = { | |
"kafka_servers": ssm_client.get_parameter( | |
Name="/kafka_spark_demo/kafka_servers")["Parameter"]["Value"], | |
"kafka_demo_bucket": ssm_client.get_parameter( | |
Name="/kafka_spark_demo/kafka_demo_bucket")["Parameter"]["Value"], | |
} | |
return params | |
if __name__ == "__main__": | |
main() |
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