Tag: Cassandra

A client recently asked us to migrate a Cassandra cluster running in Docker containers to Elassandra, with the data directory persisted via a bind mount. Elassandra is a fork of Cassandra integrated closely with Elasticsearch, to allow for a highly scalable…

DataOps Barcelona is an event organized by Binlogic and will be taking place June 21-22, 2018 in Barcelona, Spain. Pythian is proud to be supporting this inaugural open source-focused conference in Europe! DataOps is of course short for “Database +…

Every now and then I find myself looking for a couple of commands I do often. In some other software/technologies we sometimes find a thing called a “cheatsheet” that displays the more used (and some more obscure commands) of that…

Cassandra nodetool provides several types of commands to manage your Cassandra cluster. See my previous posts for an orientation to Cassandra nodetool and using nodetool to get Cassandra information. My colleague has provided an in-depth analysis of backup strategies in…

Cassandra is a distributed, decentralized, fault-tolerant system. Data is replicated throughout multiple nodes (centers) across various data centers. The fact that Cassandra is decentralized means that it can survive single or even multi-node failures without losing any data. With Cassandra,…

Cassandra nodetool provides several types of commands to manage your Cassandra cluster. See my previous post about Cassandra nodetool for an orientation to the types of things you can do with this helpful Cassandra administration tool. Here, I am sharing details…

Nodetool is a broadly useful tool for managing Cassandra clusters. A large percentage of questions concerning Cassandra can easily be answered with a nodetool function. Having been developed over time by a diverse open source community, the nodetool commands can…

I was recently asked to set up a solution for Cassandra open-source log analysis to include in an existing Elasticsearch-Logstash-Kibana (ELK) stack. After some research on more of the newer capabilities of the technologies, I realized I could use “beats”…

If you’re starting new or in the 3.0.x series: 3.11.2 Apache Cassandra 3.0 is supported until 6 months after 4.0 release (date TBD) If you’re in 2.x, update to the latest in the series (2.1.20, 2.2.12) Apache Cassandra 2.2 is supported…

Cassandra Support for Transactions Unlike commonly used relational database platforms, Cassandra does not support ACID transactions. Cassandra prioritizes availability and being partition-tolerant above consistency. Consistency is tuneable, but in general, the design precludes transactions. That is, there is no guarantee,…