Name: Helsinki Open Source Data Infrastructure Meetup w/ Wolt - May 2024
Start: 2024-05-29T14:30:00.000Z
End: 2024-05-29T18:00:00.000Z
Location: Pohjoinen Rautatiekatu 21

* Are you interested in learning more about open-source data technologies? ✅
* Do you want to network with local and international tech professionals in a fun, relaxed environment? ✅

Then join us at the Microsoft Reactor on May 4, for a meetup co-hosted by Aiven and Decodable, right after Kafka Summit.

**Agenda:**

* 11:00 - 11:30 Welcome: Networking & refreshments
* 12:30 - 11:40 Kickoff: Welcome from Aiven & Decodable
* 11:40 - 12:00 **Beginners guide to balance your data across Apache Kafka partitions** - [Olena Kutsenko](https://www.linkedin.com/in/olenakutsenko/), Senior Developer Advocate at Aiven
* 12:00 - 12:20 **From Postgres to OpenSearch in No Time** \- Gunnar Morling\, Decodable
* 12:20 - 12:40 **Stream Processing using Pyflink Table API and FlinkSQL** \- Diptiman Raichaudhuri\, Developer Advocate\, Confluent
* 12:40 - 14:00 Lunch & networking

**Beginners guide to balance your data across Apache Kafka partitions**
Apache Kafka is a distributed system. At the heart of Apache Kafka is a set of brokers that contain topics. Topics are split into partitions. Dividing topics into smaller pieces allows us to work with data in parallel and achieve higher data throughput.

Such parallelization is the key to a performant cluster, however it comes with a price. First, reading from multiple partitions will eventually mess up the order of records, meaning that the resulting order will be different from when the data was pushed into the cluster. Another big challenge is uneven distribution of data across partitions.

Overloaded partitions present a dangerous issue for performance of all involved parties, but especially for brokers and consumers. Therefore, when building our product architecture we should carefully weigh up how many partitions we need, how to ensure proper message ordering, how to balance records across partitions, not forgetting about data load distribution over time. And do all of this while still maintaining good performance of the cluster.

If you're fresh to Apache Kafka, or looking for good practices to design your partitions and avoid common pitfalls, you'll find this session useful!

Olena is a seasoned expert in data, sustainable software development, and teamwork. With a background in software engineering, she's led teams and developed mission-critical applications at Nokia, HERE Technologies, and AWS. Currently, she works at Aiven where she supports developers and customers in using open-source data technologies such as Apache Kafka, ClickHouse, and OpenSearch. She is also an international public speaker and regularly presents at conferences around the world. She holds AWS Developer and Solutions Architect certifications, and is also a Confluent Catalyst.

**From Postgres to OpenSearch in No Time**
You've been tasked with implementing a data streaming pipeline for propagating data changes from your operational Postgres database to a search index in OpenSearch. Data views in OS should be denormalized for fast querying, and of course there should be no noticeable impact on the production database.

In this session we'll discuss how to build this data pipeline using two popular open-source projects: Debezium for log-based change data capture (CDC) and Apache Flink for stream processing. Join us for this talk and learn about:
\* Setting up change data streams with Debezium
\* Efficiently building nested data structures from 1:n joins
\* Deployment options: Kafka Connect vs. Flink CDC

Gunnar Morling is a Software Engineer and open-source enthusiast by heart, currently working at Decodable on stream processing based on Apache Flink. In his prior role as a software engineer at Red Hat, he led the Debezium project, a distributed platform for change data capture. He is a Java Champion and has founded multiple open source projects such as JfrUnit, kcctl, and MapStruct. Gunnar is an avid blogger (morling.dev) and has spoken at various conferences like QCon, Java One, and Devoxx. He lives in Hamburg, Germany.

Bengaluru Open Source Data Infrastructure Meetup

Floor Drees

Mohammed Madani

Supriya S

India Open Source Data Infrastructure Meetup - May 2024

Microsoft Reactor Bengaluru

* Are you interested in learning more about open-source data technologies? ✅
* Do you want to network with local and international tech professionals in a fun, relaxed environment? ✅

Then come join us on Wednesday, May 15, for an evening full of inspiring conversations and exciting tech talks!

**Date:** May 15, 2024

**Location:** Fleminggatan 18, Stockholm, Convendum (see the [maps](https://www.google.com/maps/place/CONVENDUM+COWORKING+SPACE/@59.3340096,18.0453047,15z/data=!4m2!3m1!1s0x0:0xfabbb260bcdaefc8?sa=X&ved=2ahUKEwjdkon_za6AAxVoc_EDHYwVBZoQ_BJ6BAhHEAA&ved=2ahUKEwjdkon_za6AAxVoc_EDHYwVBZoQ_BJ6BAhUEAg) for direction)

**Agenda**

* 17:00 - 17:30 Welcome: Networking & snacks
* 17:30 - 17:35 Kickoff by Irori & Aiven
* 17:35 - 18:10 **SQL Injection: Attacks & Defenses (How do attackers exfiltrate data and how can we prevent it?)** \- Mostafa Moradian\, Senior Software Engineer at Grafana Labs
* Abstract: In this talk, Mostafa will talk about the basics of SQL injection attacks, how security professionals test systems against these vulnerabilities and use defensive mechanisms and tools to protect vulnerable systems and applications while demonstrating the SQL IDS/IPS plugin for GatewayD. He'll dive deep into SQL injection attacks from the OWASP Top 10 perspective, showcase a vulnerable app and execute a live attack against it. Then the detection mechanisms and prevention techniques and tools are explored. After this session, the audience will have a better understanding of the SQL injection vulnerability and how to prevent it using defensive programming and other tools and techniques.
* 18:10 - 18:45 **How to gain advantage from using Streaming Data on top of Kafka** \- Gustav Norbäcker\, Solution Architect at Irori
* Abstract: In this talk, Gustav will discuss how to leverage streaming data to gain a competitive advantage. He'll break down the benefits in three key areas: service quality, feature velocity, and cost efficiency. The talk will also include a deep dive into a real-world example, showcasing the implementation of Event Driven Architecture to an existing customer master for a Swedish retailer.
* 18:45 - 20:00 Food & networking\*

\* Please note that this is an alcohol-free event. Light bites will be provided.
\* By attending this event, you agree to abide by our [community code of conduct](https://aiven.io/community/forum/t/code-of-conduct/32).

Stockholm Open Source Data Infrastructure Meetup

Team Aiven

Giovanni Manfredi

Julia Bukato

Stockholm Open Source Data Infrastructure Meetup - May 2024

CONVENDUM COWORKING SPACE

* Are you interested in learning more about open-source data technologies? ✅
* Do you want to network with local and international tech professionals in a fun, relaxed environment? ✅

Then join us on May 15, for an evening full of inspiring conversations and exciting talks!

**Agenda:**

* 18:30 - 19:00 Welcome: Networking & snacks
* 19:00 - 19:10 Kickoff: Welcome Aiven
* 19:10 - 19:40 **Fast PostgreSQL in C++ with libpqxx** - [Jeroen Vermeulen](https://www.linkedin.com/in/jeroen-vermeulen-020533/), Cloud Engineer at Cisco
* Abstract: There are many "better" languages out there, but nothing beats C++ for speed. If your C++ application needs to store data in PostgreSQL fast, or needs to retrieve it fast, here's how to do it. We'll use libpqxx, the C++ client library.
* 19:40 - 20:10 **PostgreSQL without permanent local data storage** \- Matthias van de Meent\, PostgreSQL hacker\, Developer at Neon Inc\.
* PostgreSQL depends on the local file system for various consistency and persistence guarantees. However, in the Cloud where local disks are ephemeral, you'll have to look for other solutions. Network-attached disks (like EBS) are one way to persist data in a cloud environment, but at Neon we decided to disaggregate storage and compute, and get rid of the local file system entirely for long-term data storage.
This talk discusses the technical challenges we encountered at Neon while building a disaggregated storage and compute project based on a PostgreSQL fork: the problems that we encountered, the solutions we built for them, and the benefits we get from disaggregating storage and compute.
* 20:10 \~ 21:00 Food & networking

*Please note that this is an alcohol-free event. Light bites will be provided.*

*By attending this event, you agree to abide by our [Community Code of Conduct](https://aiven.io/community/code-of-conduct).*

Amsterdam Open Source Data Infrastructure Meetup

Ketan Patel

Abhishek Jha

Amsterdam Open Source Data Infrastructure meetup - May 2024

Datadog Netherlands

[ITA]
Unisciti a noi il **22 maggio** per una serata ricca di interessanti talks.

La serata prevede una serie di talk seguiti da cibo e socializzazione.
**Programma:**
6:00PM - Apertura delle porte & drinks
6:30PM - **On Open Telemetry - Splunk**
7:00PM - **TBA**

Le sessioni saranno in *lingua inglese*.

[ENG]
Join us on May 22nd for an evening full of interesting talks.

The evening will feature a series of talks followed by food\* and socialising later in the evening.

\*Note: This is an alcohol-free event.

**Program:**

* 6:00 - 6:30PM - Open doors & drinks
* 6:30PM - **On Open Telemetry - Splunk**
* 7:00PM - **TBA**
* 7:30 - 9:00PM - Food & Socialising

Note: Recording equipment will be present.

Milano Open Source Data Infrastructure Meetup

Salvatore

Ludovico Besana

Milan Open Source Data Infrastructure Meetup - May 2024

YoRoom Coworking & Office

* Are you interested in learning more about open-source data technologies? ✅
* Do you want to network with local and international tech professionals in a fun, relaxed environment? ✅

Then join us on May 29 at the Wolt HQ, for an evening full of inspiring conversations and exciting talks!

**Agenda:**

* 17:30 - 18:00 Doors open: Networking & snacks
* 18:00 - 18:10 Kickoff: Welcome Wolt + Aiven
* 18:10 - 18:40 **The State of Kafka Tiered Storage -** Jorge Quilcate, Senior Software Engineer at Aiven
* 18:40 - 19:10 **Talk TBA**
* 19:10 \~ 21:00 Food & networking

*Please note that this is an alcohol-free event.*
*By attending this event, you agree to abide by our [Community Code of Conduct](https://aiven.io/community/code-of-conduct).*

Helsinki Open Source Data Infrastructure Meetup

Vy Nguyen

Taige Wang

Helsinki Open Source Data Infrastructure Meetup w/ Wolt - May 2024

Pohjoinen Rautatiekatu 21

Open Source Data Infrastructure Community by Aiven

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