plisken1997/bbl-kafka

streaming application used in a apache kafka presentation

Kafka BBL

monitoring:

• https://github.com/framiere/monitoring-demo
• https://github.com/yahoo/kafka-manager

kafka manager

configure and deploy

run

  bin/kafka-manager -Dconfig.file=/path/to/conf/application.conf

install

from docker

https://docs.confluent.io/current/installation/docker/docs/quickstart.html

from confluent applications

https://docs.confluent.io/current/installation/installing_cp/index.html

CLI

run-broker

  bin/kafka-server-start etc/kafka/server-1.properties

list topic

  bin/kafka-topics --list --zookeeper localhost:2181

producer

  bin/kafka-console-producer --broker-list "localhost:9092" --topic "bbl-kafka"  

consumer

  bin/kafka-console-consumer --topic "bbl-kafka" --bootstrap-server localhost:9092

KSQL

offset

  SET 'auto.offset.reset' = 'earliest';

k-streams

no-format

create stream game_users (user Varchar) WITH(kafka_topic='game-opinions-1', value_format='json');

SELECT 
    EXTRACTJSONFIELD(user, '$.source.type') AS source_type, 
    EXTRACTJSONFIELD(user, '$.name') as user_name, 
    EXTRACTJSONFIELD(user, '$.age') AS age 
FROM 
    game_users;

with-format

create stream game_users_format AS SELECT EXTRACTJSONFIELD(user, '$.source.type') AS source_type, EXTRACTJSONFIELD(user, '$.name') as user_name, EXTRACTJSONFIELD(user, '$.age') AS user_age FROM game_users;

SELECT 
    source_type, 
    user_name, 
    age 
FROM 
    game_users_format;

k-table

CREATE TABLE game_user_sources WITH(
    kafka_topic='game_user_sources'
) 
AS
SELECT 
    source_type, 
    COUNT(source_type) AS count_sources
FROM 
    game_users_format
GROUP BY
    source_type

SELECT source_type, count_sources FROM game_user_sources;