We’re pleased to announce that Reaper 2.2 for Apache Cassandra was just released. This release includes a major redesign of how segments are orchestrated, which allows users to run concurrent repairs on nodes. Let’s dive into these changes and see what they mean for Reaper’s users.

In a previous blog post recommending disabling read repair chance, some flamegraphs were generated to demonstrate the effect read repair chance had on a cluster. Let’s go through how those flamegraphs were captured, step-by-step using Apache Cassandra 3.11.6, Kubernetes and the cass-operator, nosqlbench and the async-profiler.

Apache Cassandra’s default value for num_tokens is about to change in 4.0! This might seem like a small edit note in the CHANGES.txt, however such a change can have a profound effect on day-to-day operations of the cluster. In this post we will examine how changing the value for num_tokens impacts the cluster and its behaviour.

Apache Cassandra has a feature called Read Repair Chance that we always recommend our clients to disable. It is often an additional ~20% internal read load cost on your cluster that serves little purpose and provides no guarantees.