Designing a multi-tenant SaaS

Designing a multi-tenant SaaS

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This article is based on my talk Designing a multi-tenant SaaS given at Cloud Nord on October 12, 2023. Kestra is a highly scalable data scheduling and orchestration platform that creates, executes, schedules and monitors millions of complex pipelines. For an introduction to Kestra, you can read my article on the subject. One of the recent Kestra evolutions I was responsible for was multitenancy support, this article will tell you about the design that went into adding this functionality. Multitenancy…

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Java 22: what’s new?

Java 22: what’s new?

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Now that Java 22 is features complete (Rampdown Phase One at the day of writing), it’s time to walk through all the functionalities that bring to us, developers, this new version. This article is part of a series on what’s new on the last versions of Java, for those who wants to read the others, here are the links: Java 21, Java 20, Java 19, Java 18, Java 17, Java 16, Java 15, Java 14, Java 13, Java 12, Java…

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PostgreSQL index optimization

PostgreSQL index optimization

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Some time ago, I worked on query execution time optimizations for PostgreSQL, I talk about it here: The VISUALVM SQL PROFILE. Kestra is a highly scalable data orchestration and scheduling platform that creates, executes, schedules, and monitors millions of complex pipelines. It’s also the company I work for! The open source version of Kestra uses a database engine, while the Enterprise Edition lets you use an alternative engine based on Kafka and Elasticsearch. The database engine supports H2, PostgreSQL and…

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Java 21: what’s new ?

Java 21: what’s new ?

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Now that Java 21 is features complete (Rampdown Phase Two at the day of writing), it’s time to walk through all the functionalities that bring to us, developers, this new version. This article is part of a series on what’s new on the last versions of Java, for those who wants to read the others, here are the links: Java 20, Java 19, Java 18, Java 17, Java 16, Java 15, Java 14, Java 13, Java 12, Java 11, Java 10, and Java…

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VisualVM SQL profiler SQL

VisualVM SQL profiler SQL

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A little while ago, I discovered the SQL profiler of VisualVM and I thought I should share it with you ;). VisualVM is a tool that provides a visual interface to display detailed information about applications running on a Java Virtual Machine (JVM). VisualVM is designed for use in development and production. VisualVM provides lightweight profiling tools including a SQL profiler. This will detect each SQL query (passing through the JDBC layer) and group them in a tabular view with…

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Introduction to Kestra

Introduction to Kestra

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Kestra is an open-source data orchestrator and scheduler. With Kestra, data workflows, called flows, use the YAML format and are executed by its engine via an API call, the user interface, or a trigger (webhook, schedule, SQL query, Pub/Sub message, …). The important notions of Kestra are : The flow: which describes how the data will be orchestrated (the workflow thus). It is a sequence of tasks . The task: a step in the flow that will perform an action…

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