Lambda architecture

Read about the project here

Watch the videos demonstrating the project here

Our Lambda project receives real-time IoT Data Events coming from Connected Vehicles, then ingested to Spark through Kafka. Using the Spark streaming API, we processed and analysed IoT data events and transformed them into vehicle information. While simultaneously the data is also stored into HDFS for Batch processing. We performed a series of stateless and stateful transformation using Spark streaming API on streams and persisted them to Cassandra database tables. In order to get accurate views, we also perform a batch processing and generating a batch view into Cassandra. We developed responsive web traffic monitoring dashboard using Spring Boot, SockJs and Bootstrap which get the views from the Cassandra database and push to the UI using web socket.

All component parts are dynamically managed using Docker, which means you don't need to worry about setting up your local environment, the only thing you need is to have Docker installed.

System stack:

• Java 11
• Maven
• ZooKeeper
• Kafka
• Cassandra
• Spark 3
• Docker
• HDFS

The streaming part of the project was done from iot-traffic-project InfoQ

How to use

• mvn package
• docker-compose -p lambda up
• Wait all services be up and running, then...
• ./project-orchestrate.sh
• Run realtime job docker exec spark-master /spark/bin/spark-submit --class com.apssouza.iot.streaming.StreamingProcessor --master spark://localhost:7077 /opt/spark-data/iot-spark-processor-1.0.0.jar
• Access the Spark cluster http://localhost:8080
• Run the traffic producer java -jar iot-kafka-producer/target/iot-kafka-producer-1.0.0.jar
• Run the service layer (Web app) java -jar iot-springboot-dashboard/target/iot-springboot-dashboard-1.0.0.jar
• Access the dashboard with the data http://localhost:3000/
• Run the batch job docker exec spark-master /spark/bin/spark-submit --class com.apssouza.iot.batch.BatchProcessor --master spark://localhost:7077 /opt/spark-data/iot-spark-processor-1.0.0.jar
• Run the ML job docker exec spark-master /spark/bin/spark-submit --class com.apssouza.iot.ml.SpeedPrediction --master spark://localhost:7077 /opt/spark-data/iot-spark-processor-1.0.0.jar

Miscellaneous

Spark

Submit a job to master

• mvn package
• spark-submit --class com.apssouza.iot.streaming.StreamingProcessor --master spark://spark-master:7077 iot-spark-processor/target/iot-spark-processor-1.0.0.jar Add spark-master to /etc/hosts pointing to localhost

GUI

http://localhost:8080 Master http://localhost:8081 Slave

HDFS

Commands https://hortonworks.com/tutorial/manage-files-on-hdfs-via-cli-ambari-files-view/section/1/

Open a file - http://localhost:50070/webhdfs/v1/path/to/file/file.csv?op=open

Web file handle - https://hadoop.apache.org/docs/r1.0.4/webhdfs.html

Commands :

• hdfs dfs -mkdir /user
• hdfs dfs -mkdir /user/lambda
• hdfs dfs -put localhost.csv /user/lambda/
• Access the file http://localhost:9870/webhdfs/v1/user/lambda/localhost.csv?op=OPEN&namenoderpcaddress=namenode:8020&offset=0

Gui

http://localhost:9870 http://localhost:50075

Kafka

• kafka-topics --create --topic iot-data-event --partitions 1 --replication-factor 1 --if-not-exists --zookeeper zookeeper:2181
• kafka-console-producer --request-required-acks 1 --broker-list kafka:9092 --topic iot-data-event
• kafka-console-consumer --bootstrap-server kafka:9092 --topic iot-data-event
• kafka-topics --list --zookeeper zookeeper:2181

Cassandra

• Log in docker exec -it cassandra-iot cqlsh --username cassandra --password cassandra
• Access the keyspace use TrafficKeySpace;
• List data SELECT * FROM TrafficKeySpace.Total_Traffic;

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