The talk will start shortly - before then, have a chat with your fellow attendees! Questions at the end This is unless the speaker says otherwise. But generally, because of internet delays and lags it can be a bit disruptive during an Online talk. Online Meetup Etiquette Mute during talk But remember to unmute when you want to ask a question at the end (or chat with fellow attendees before/After) Use chat to engage Use Zoom chat and/or create a thread in the #events channel on our Community Slack space so that your discussion can continue afterwards with fellow Kafkateers. Be on Camera & React! Speakers during these events are talking to blank screens. And it can be exhausting! Use Zoom reactions at the bottom of the page to give them something to work off of! 1. 2. Continue learning and collaborating WELCOME! Thank you for joining us in these unique circumstances. We hope you’re safe and well. 3. If you haven’t already joined, get on the our slack workspace and continue the conversation with other Kafkateers. If you’re already a member, start a thread for this event in #events. A single online source of everything you’ll need to learn Kafka. Plus it’s totally free and ungated… Confluent Developer developer.confluent.io https://cnfl.io/slack Confluent Community Slack You are being recorded and this footage may be added to public channels

About me @riferrei | #kafkameetup | @CONFLUENTINC • RICARDO FERREIRA • Works for confluent • Developer advocate • Ricardo@confluent.iO • HTTPS://RIFERREI.NET

Building event streaming apps with pac-man @riferrei | #kafkameetup | @CONFLUENTINC

@riferrei | #kafkameetup | @CONFLUENTINC Current state SQL SQL SQL application application application database LOG

@riferrei | #kafkameetup | @CONFLUENTINC Why?

@riferrei | #kafkameetup | @CONFLUENTINC I don’t know “my app only understands sql” “the source only understands sql” “I can only process atomic data” “that is what current books says” “it just feels right doing like this”

@riferrei | #kafkameetup | @CONFLUENTINC But what if… database 1000x more volume Non-transactional events Transactional events LOG

what? Are you kidding me?

@riferrei | #kafkameetup | @CONFLUENTINC This is fine

@riferrei | #kafkameetup | @CONFLUENTINC Solving the problem

@riferrei | #kafkameetup | @CONFLUENTINC Using the log database LOG 0 1 2 3 4 5 6 7 8 LOG reads New records application a (time = 1) application b (time = 3)

@riferrei | #kafkameetup | @CONFLUENTINC But log programming hurts public void readTransactions() { while (true) { ConsumerRecords records = consumer.poll(Duration.ofMillis(100)); for (Record record : records) { if (record.offset() != lastSavedOffset) {...} } } }

@riferrei | #kafkameetup | @CONFLUENTINC What then?

@riferrei | #kafkameetup | @CONFLUENTINC Event streaming appS

@riferrei | @confluentinc | @itau

@riferrei | @confluentinc | @itau

@riferrei | #kafkameetup | @CONFLUENTINC PAC-MAN

@riferrei | #kafkameetup | @CONFLUENTINC https://github.com/confluentinc/demo-scene <> Getting started

@riferrei | #kafkameetup | @CONFLUENTINC IMPLEMENTATION Api gateway Lambda function Kafka topic Ksqldb apps Kafka topic scoreboard

@riferrei | #kafkameetup | @CONFLUENTINC IMPLEMENTATION Kafka topic Ksqldb apps Kafka topic

@riferrei | #kafkameetup | @CONFLUENTINC Let’s create the streams

@riferrei | #kafkameetup | @CONFLUENTINC instructions 1. Get the game 2. Name yourself

@riferrei | #kafkameetup | @CONFLUENTINC BUILDING the scoreboard

@riferrei | #kafkameetup | @CONFLUENTINC Introduction to ksqldb https://ksqldb.io

@riferrei | #kafkameetup | @CONFLUENTINC Source: USER_GAME TOPIC

@riferrei | #kafkameetup | @CONFLUENTINC Creating User_game stream

@riferrei | #kafkameetup | @CONFLUENTINC Querying USER_GAME STREAM

@riferrei | #kafkameetup | @CONFLUENTINC Creating Stats_per_user table

@riferrei | #kafkameetup | @CONFLUENTINC Querying STATS_PER_USER TABLE

@riferrei | #kafkameetup | @CONFLUENTINC Low latency Pull queries

@riferrei | #kafkameetup | @CONFLUENTINC Source: User_losses topic

@riferrei | #kafkameetup | @CONFLUENTINC Creating USER_LOSSES STREAM

@riferrei | #kafkameetup | @CONFLUENTINC querying USER_LOSSES STREAM

@riferrei | #kafkameetup | @CONFLUENTINC Creating LOSSES_PER_USER TABLE

@riferrei | #kafkameetup | @CONFLUENTINC Querying LOSSES_PER_USER TABLE

@riferrei | #kafkameetup | @CONFLUENTINC Creating SCOREBOARD TABLE

@riferrei | #kafkameetup | @CONFLUENTINC Querying SCOREBOARD TABLE

@riferrei | #kafkameetup | @CONFLUENTINC Playing with The data

@riferrei | #kafkameetup | @CONFLUENTINC Read from kafka Api gateway Lambda function scoreboard Redis cache push

@riferrei | #kafkameetup | @CONFLUENTINC Read from kafka Amazon alexa Lambda function scoreboard Redis cache push

@riferrei | #kafkameetup | @CONFLUENTINC Read from ksqldb Your code Ksqldb table pull Kafka topic

@riferrei | #kafkameetup | @CONFLUENTINC Creating highest_score TABLE

@riferrei | #kafkameetup | @CONFLUENTINC Low latency Pull queries 69920

@riferrei | #kafkameetup | @CONFLUENTINC how can I learn more?

@riferrei | #kafkameetup | @CONFLUENTINC Get kafka: confluent cloud Try free: https://cnfl.io/confluent-cloud

@riferrei | #kafkameetup | @CONFLUENTINC https://cnfl.io/tutorials Get examples: kafka tutorials

@riferrei | #kafkameetup | @CONFLUENTINC https://cnfl.io/books Get books: o’reilly bundle

@riferrei | #kafkameetup | @CONFLUENTINC https://kafka-summit.org/events/kafka-summit-austin-2020 join kafka summit https://myeventi.events/kafka20/aus Use 25% discount code: KSa20Meetup

@riferrei | #kafkameetup | @CONFLUENTINC Thank you