Apache Flink

https://flink.apache.org/

Apache Flink® is an open source platform for distributed stream and batch data processing. Flink’s core is a streaming dataflow engine that provides data distribution, communication, and fault tolerance for distributed computations over data streams.

Getting started

Installation

wget http://www.apache.org/dyn/closer.lua/flink/flink-1.1.2/flink-1.1.2-bin-hadoop27-scala_2.11.tgz
tar xf flink-1.1.2-bin-hadoop27-scala_2.11.tgz
FLINK_HOME=~/flink-1.1.2
cd $FLINK_HOME
ls bin
ls examples

Local Execution

cd $FLINK_HOME
bin/start-local.sh

Open the UI http://localhost:8081/#/overview

Flink UI

cd $FLINK_HOME
bin/start-scala-shell.sh

Run the SocketWindowWordCount example (source).

Terminal 1: Start netcat

nc -l 9000

Submit the Flink program:

bin/flink run examples/streaming/SocketWindowWordCount.jar --port 9000

Terminal 1: Add words in netcat input

lorem ipsum
ipsum ipsum ipsum
bye

Terminal 3:

tail -f log/flink-*-jobmanager-*.out

Terminal 4: stop Flink

bin/stop-local.sh