Jonathan Ellis

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Jonathan Ellis

Jonathan is the founder of Brokk (https://brokk.ai). Brokk keeps LLMs on-task in million-line codebases by adding compiler-grade understanding of your code's structure and semantics.

Jonathan is also the author of JVector, co-founder of DataStax, and the founding project chair of Apache Cassandra.

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New Java Benchmark for Coding LLMs puts GPT-5 at the top

Table of Contents GPT-5 is on top at every performance level and every price point… but it’s no speed demonPerformance by task lengthOther observationsImplications for buildersA Note on Reasoning Introducing the Brokk Power Ranking The Brokk Power Ranking is a ...

Brokk: AI for Large (Java) Codebases

Table of Contents Sidebar: Under the HoodRecommendationsWorking with GitSidebar: LLM ModelsThe Edit Loop There are two reasons that AI makes mistakes writing code: The LLM just isn’t smart enough to tackle the problem effectively, and it simply gets the answer …

Indexing all of Wikipedia, on a laptop

Indexing the entirety of English Wikipedia on a laptop has become a practical reality thanks to recent advances in the JVector library that will be part of the imminent 3.0 release.

JVector 1.0

JVector is a pure Java embedded vector search engine that powers DataStax Astra and is being added to Apache Cassandra.

Why Pulsar Beats Kafka for a Scalable, Distributed Data Architecture

Table of Contents Microservices and PulsarHow Pulsar fits into the open source mindsetPulsar’s role The leading open source event streaming platforms are Apache Kafka and Apache Pulsar. For enterprise architects and application developers, choosing the right event streaming approach is …

The Critical Role Streaming Plays in a Data Stack

In this article we are discussed Why Apache Pulsar and its support for streaming data is the right choice for multi-datacenter, geo-distributed deployments.

Four Reasons Why Apache Pulsar is Essential to the Modern Data Stack

Messaging has been on DataStax’s radar for several years. Let’s learn the top reasons why we should consider Apache Pulsar.

Apache Cassandra 4.0: Taming Tail Latencies with Java 16 ZGC

With Apache Cassandra 4.0, you not only get the direct improvements to performance added by the Apache Cassandra committers, you also unlock the ability to take advantage of seven years of improvements in the JVM itself.

This article focuses on improvements in Java garbage collection that Cassandra 4.0 coupled with Java 16 offers over Cassandra 3.11 on Java 8.

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