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Click to Follow gunnarmorling

Gunnar Morling

@gunnarmorling

Software engineer

· Ex-lead of Debezium · Spec lead of Bean Validation 2.0 · Creator of JfrUnit, kcctl and MapStruct · Java Champion ·

Hamburg, Germanymorling.devJoined February 2014

32.1K Followers

Gunnar Morling 🌍’s Tweets

Pinned Tweet

📝 Blogged: "The JDK Flight Recorder File Format" Spent some time with a debugger and a hex editor for exploring the format of #JFR recordings, and how it efficiently stores large numbers of events. #Java morling.dev/blog/jdk-fligh (link to SVG version of the image inside)

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📺 Getting started in 2 min! #ApacheFlink #FlinkSQL

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Curious to do you first steps with #ApacheFlink and Flink SQL? Then join the fabulous @hkdulay and me tomorrow for this demo-centered live webinar, where we'll do exactly that -- starting with Flink from the ground up!

Jan 26, 10 am PST

info.decodable.co/webinar-gettin

A visual with date, time, and title of the webinar: "Getting Started with Flink and Flink SQL"

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👟 Ready to kick off today's webinar with

and

in just about an hour (10am Pacific). The only thing missing is you! Sign up and let's learn some

from the experts 🤓 bit.ly/3wejKWb

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New

example showcasing the new standalone

server sourcing data from

and writing to JetStream! 🥳

natsbyexample.com

Change Data Capture via Debezium (CLI)

Change data capture (CDC) can be desirable to setup on databases in order to stream granular change events to other parts of the system as data changes. A fairly popular open source project that...

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@rmoff@data-folks.masto.host

Source-available and Open Source licences are very, very different things. It’s not fair on FOSS developers and users to conflate the two, whether by accident, ignorance, or design.

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Replying to

and

Java has *a lot* going for it: it's relatively easy to learn, applicable for a large range of problems (even more so with current developments like Loom, SIMD support, Valhalla), world-class runtime (great perf, observability), massive eco-system of libs for everything, etc.

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At Shopify, making sure our

applications stay performant & resilient is top priority Check out our tips for optimizing large stateful Flink applications👇

shopify.engineering

3 (More) Tips for Optimizing Apache Flink Applications

Earlier this year, we shared our tips for optimizing large stateful Apache Flink applications. Below we’ll walk you through 3 more best practices.

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Richard Seroter

Plenty of new shiny programming languages get all the press, but ol' Java keeps trucking along, running the world's most important systems. This post from

offers up a terrific guide for those getting started.

Getting Started With Java Development in 2023 — An Opinionated Guide

27 years of age, and alive and kicking — The Java platform regularly comes out amongst the top contenders in rankings like the TIOBE index. In my opinion, rightly so. The language is very actively...

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I hope as much people as possible get to read this! Please just tell me how to update a deprecated API🙏

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Never deprecate an API (method, class, etc.) without clearly documenting the intended replacement. Failing to do so makes for a very frustrating experience for your users. Bonus points for providing executable migrations, e.g. using OpenRewrite.

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Curious to do you first steps with #ApacheFlink and Flink SQL? Then join the fabulous

and me tomorrow for this demo-centered live webinar, where we'll do exactly that -- starting with Flink from the ground up! 🗓️ Jan 26, 10 am PST 🔗 info.decodable.co/webinar-gettin

A visual with date, time, and title of the webinar: "Getting Started with Flink and Flink SQL"

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I wished ergonomics around #Java records and optional components were a bit better. IIUC it was a non-goal, but usage right now is a bit cumbersome, as you can't change the type in the accessor, effectively requiring Optional<SomeComponentType> to be passed to the constructor.

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Der

und ich machen jetzt den #Java Blog auf

-> heise.de/blog/Hello-Wor ☕️✌️🧑‍💻 Wir haben schon ein paar coole Posts in der Pipeline und planen die Themen #Java, #OpenJDK und die Java Community in Zukunft vermehrt bei #Heise zu platzieren 😄

Hello World 2.0: Der Java-Blog bei heise Developer startet wieder durch

Der Blog „Neuigkeiten von der Insel“ geht endlich weiter! Hier gibt es News und Meinungen zu Java, dem OpenJDK und aktuellen Themen der Java Community

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Never deprecate an API (method, class, etc.) without clearly documenting the intended replacement. Failing to do so makes for a very frustrating experience for your users. Bonus points for providing executable migrations, e.g. using OpenRewrite.

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Watch this talk by

to learn how Debezium and Apache Kafka can help you building reliable subscriptions from changes in your database.

portal.gitnation.org

GraphQL Subscriptions with Debezium and Kafka by Nils Hartmann - GitNation

Follow all the important community JavaScript events, talk recordings and hands-on workshops brought to you by GitNation team.

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Hey

, I'm getting notification mails from a "Test Topic" on some forum of yours. Could you look into disabling this, I have not subscribed to that. Thanks 🙏!

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"The bountiful world of Postgres indexing options" Enjoyed reading this post by Kaarel Moppel; TIL that #Postgres supports the creation of covering indexes via `INCLUDE`, allowing for fast index-only scans. kmoppel.github.io/2022-12-09-the

A table showing the benchmark results from the linked article, comparing different index types, the runtime of a test query on 10M rows, and the index size (see article for full details).

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Mind-blowing: just found this tool to visualize Postgres B-Tree indexes, and a blogpost explaining them from

How have I never heard of this tool before? Where has it been all my life? 😍 louisemeta.com/blog/indexes-b github.com/louiseGrandjon

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📢 What comes after #KafkaSummit? That's right -- #Current23! The data streaming community is gathering again in Austin/TX (Aug 29/30). Looking forward to your proposals on anything EDA, data streaming and processing, real-time OLAP, etc! CfP is open NOW. sessionize.com/current-2023/

We invite you to speak at the 2nd annual data streaming industry event, Current 2023: The Next Generation of Kafka Summit. Current captures the fast-moving data streaming movement, bringing this broad community together for learning, sharing, and networking to help data professionals unlock the value from their data.

Current 2023 is a technical conference for Event-Driven Design, Streaming Technology and Real-Time systems. Expanding upon Kafka Summit to include the broader ecosystem of streaming platforms, real-time analytics, and more, this is your opportunity to share your experiences and stories with your peers.

Current 2023 is the definitive source to learn about data streaming and the only place where the full community of real-time technology leaders and developers will come together to share best practices and use cases as well as explore the vision and future of data streaming. Data streaming is foundational to a next-gen architecture. How are you charting your path forward?

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A lesser known #GitHub feature: support for excluding specific commits from the blame view. Just add a file .git-blame-ignore-revs to your repo root, listing the SHAs e.g. of bulk formatting commits. Locally, use git blame with `--ignore-revs-file=...` to do the same.

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"Performance Benchmarking with TPC-C" Props to

for not only publishing benchmark results, but also sharing detailed instructions for reproducing this by yourself (including a 81x c5d.9xlarge nodes set-up 🤯). Way to go 👍! cockroachlabs.com/docs/stable/pe

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Chris Riccomini

DBs are getting totally ripped apart right now and I love it. Query engines (trino, duck), storage (s3, gcs), and indexing (iceberg, hudi) all separate.

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"Querying SQLite databases with DuckDB" Enjoyed watching this fast-paced video by @markhneedham demoing how to use #DuckDB's query engine to run analytics queries against data in a #SQLite file. 5:50 well spent

! youtube.com/watch?v=ogge3k

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#VeniceDB is also a deconstructed DB, of sorts. The streaming write path goes like this: 1. Produce write operation (put, delete, update) into a RT Kafka topic (i.e. the WAL).

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Chris Riccomini

DBs are getting totally ripped apart right now and I love it. Query engines (trino, duck), storage (s3, gcs), and indexing (iceberg, hudi) all separate. twitter.com/gunnarmorling/…

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Murat Demirbas (Distributolog)

[new blog post: paper review] Is Scalable OLTP in the Cloud a Solved Problem? (CIDR 2023) muratbuffalo.blogspot.com/2023/01/is-sca

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"Querying SQLite databases with DuckDB" Enjoyed watching this fast-paced video by

demoing how to use #DuckDB's query engine to run analytics queries against data in a #SQLite file. 5:50 well spent 🦆!

Querying SQLite databases with DuckDB

In this video, we'll learn how to query the European Soccer SQLite database with DuckDB.#sqlite3 #duckdb

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Hans-Peter Grahsl

📢 Kryptonite for Kafka 0.4.0 (🔒#E2E #encryption🔓 for client apps) is out since the weekend. Most notable: 1️⃣ #Quarkus service to integrate with any lang/runtime over HTTP API 2️⃣ secure 🔑 storage (#Azure KeyVault) and 🔐 encryption (#GCP CloudKMS) github.com/hpgrahsl/krypt

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Friday was my last day in my previous role, and while I'm having some very productive conversations already, I would be open to more introductions and chats about Developer/API experience, tools, open source, and other engineering-focused roles. DMs are open, RTs are appreciated

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Can people stop already using Venn diagrams for "explaining" SQL joins? It makes NO SENSE!

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I wish there was a dictionary of sorts which explains key data science concepts, terms, and tools to software engineers: "notebooks", "data frames", "model building", etc. I'm sure that'd be super useful to many dev folks out there.

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Hey

Twitter! what are your favorite PG extensions? What is a must have? Any obscure, great ones? Mine so far: pgcron,

, pg_graphql

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Tobias_Petry.sql

Replying to

I really hope pg_ivm will not loose its pace and will really be added to the core in a few years.

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Playing around a bit with #DuckDB. First impression: being able to query local directories of CSV (or Parquet, or...) files is dope 🔥. I only wished data cleansing would be a bit easier; e.g. how about an inline editor for fixing/removing bad rows? Does that exist?

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This is also a Lean strategy to make better product decisions: Last Responsible Moment. Always keep in mind that you may likely be wrong, may produce the wrong thing, and your early decision may cause rework.

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A fair share of software design is professional procrastination: keeping options on the table, doors open for as long as you can, in order to avoid locking yourself into a corner by committing too early to abstractions which turn out poor later on.

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When I work on OSS, I don't answer questions in private messages. Public channels only. No one gets preferential treatment, regardless of how discrete they consider their situation to be. That's a core tenet of my OSS philosophy & the terms under which I dedicate my time to it.

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🗣️ "This article focuses on how we leveraged open source technology to build Uber's first 'near real-time' exactly-once events processing system" Nice write-up about

,

, and

at work at

👍. uber.com/blog/real-time

A flow diagram showing the architecture discussed in the blog post: a data pipeline deployed in two regions in an "active/active" set-up, comprising the Apache projects Kafka, Flink, Pinot and Hive.

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Completely missed that #GitHub introduced fine-grained PATs a few weeks back. Much more control with those, in terms of permissions and targeted repos. Also org owners can require PAT approval, etc. Great improvement!

Introducing fine-grained personal access tokens for GitHub | The GitHub Blog

Fine-grained personal access tokens offer enhanced security to developers and organization owners, to reduce the risk to your data of compromised tokens.

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DOOONE,

!

Lets Get This Party Started Yeah GIF

GIF

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🥳 Aaand done voting on all the proposals for #KafkaSummit London and #RTASummit SF. It's always a fair bit of work, but also very rewarding to see what's happening in the industry and where folks are headed. The age of of real-time data processing is now.

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The one-way vs. two-way door analogy works great to approach design decisions.

Quote Tweet

A fair share of software design is professional procrastination: keeping options on the table, doors open for as long as you can, in order to avoid locking yourself into a corner by committing too early to abstractions which turn out poor later on.

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A great point, great point indeed.

Quote Tweet

A fair share of software design is professional procrastination: keeping options on the table, doors open for as long as you can, in order to avoid locking yourself into a corner by committing too early to abstractions which turn out poor later on.

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🗣️ "Using log-based CDC, you can set up efficient, robust, and accurate data pipelines to convert data into actionable insights that inform critical decisions in your organization" Nice comparison of CDC approaches over on the

blog 👍. redpanda.com/blog/what-is-c

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