Tag: Cassandra

When I started learning Cassandra, I noticed some concepts were not well explained, and it might be helpful for beginners to have information on a single topic in one place. This is how the idea of this blog was born….

Cassandra is an open-source NoSQL distributed database used for processing large volumes of data with high availability and scalability.     The CQL shell (cqlsh) allows users to communicate with Cassandra. Using this shell, you can execute Cassandra Query Language…

Batches are one of the most misunderstood features of Apache Cassandra. They rarely improve performance. In fact, while using batches, performance may degrade. To set the stage, let’s take a look at how Cassandra handles individual mutations.   Individual mutations…

Occasionally, clients reach out to us with authentication issues when a node is down. While this scenario shouldn’t happen in a high availability database management system (DBMS), it can if you miss a couple of very relevant lines in the…

This post is the continuation of the previous post, Cassandra 101: Understanding What Cassandra Is, in which I’ll highlight a series of topics related to Cassandra for beginners.       Replication Factor The replication factor in Cassandra can be…

One of the many things to love about Cassandra is how operationally simple it is to add, remove or even replace nodes in a cluster.     Replacing a node in Cassandra is as easy as setting your configuration files…

What is this about? Well, as the title implies, I will show how to set up Liquibase to manage changes in Snowflake as part of a DataOps practice. Why? Because I am going deep-dive into DataOps around Snowflake and I’ve…

Got too many tombstones? This blog post will talk about how to deal with tombstones once you already have them. For more information about tombstones, check out this post: Examining the Lifecycle of Tombstones in Apache Cassandra. Verifying the presence…

User-defined compactions allow us to manually select which files should be compacted. This enables us to reclaim space and limit the size of compaction so it can fit into the remaining space. These compactions are relevant only for SizeTieredCompactionStrategy (STCS)…

High latency values may indicate a cluster at the edge of its processing capacity, issues with the data model—such as poor choice of partition key or high levels of tombstones—or issues with the underlying infrastructure. Below are some major reasons…