Tag: Cassandra

At Pythian, we pride ourselves in assisting and empowering our clients. We strive to understand the needs of each customer and to teach customers to make the most of their resources. Experience has shown that the best way to learn…

On September 1, 2020, Apache disclosed a security vulnerability for Apache Cassandra. Summary: It’s possible for a local attacker without access to the Apache Cassandra process or configuration files, to manipulate the RMI registry to perform a man-in-the-middle attack and…

I recently did an upgrade of 200+ nodes of Cassandra across multiple environments sitting behind multiple applications using the cstar tool. We chose the cstar tool because, out of all automation options, it has topology awareness specifically to Cassandra. Here…

Spark Overview Spark was created in 2009 as a response to difficulties with map-reduce in Hadoop, particularly in supporting machine learning and other interactive data analysis. Spark simplifies the processing and analysis of data, reducing the number of steps and…

This weekend, I gave an orientation to Docker for a developer friend of mine who works in an enterprise environment and was preparing to take on new development projects using Docker. I have given several Docker 101 workshops, but it’s…

This post is the first part of a series of blog posts regarding the lifecycle and management of tombstones. Deleting and expiring data in Cassandra is something that you should carefully plan. Especially if you’re about to delete a massive…

In this quick blog post, I’m going to assess how the databases that advertise themselves as “Cassandra API-compatible” fare in the compatibility department. But that is all I will do, only API testing, and not an extensive testing, just based…

Overview of Cassandra As previously mentioned in my notes on lightweight transactions, Cassandra does not support ACID transactions. Cassandra was built to support a brisk ingest of writes while being distributed for availability. Follow the link to my previous post…

In this blog, I’m going to give a detailed guide on how to monitor a Cassandra cluster with Prometheus and Grafana. For this, I’m using a new VM which I’m going to call “Monitor VM”. In this blog post, I’m…

Some clients have asked us to change the number of num_tokens as their requirement changes. For example lower number of num_tokens are recommended is using DSE search etc.. The most important thing during this process is that the cluster stays…