Cassandra Cluster Tutorial 5 - Cassandra AWS Cluster with CloudFormation, bastion host, Ansible and the aws-command line This Cassandra tutorial is useful for developers and DevOps/DBA staff who want to launch a Cassandra cluster in AWS. The cassandra-image project has been using Vagrant and Ansible to set up a Cassandra Cluster for local testing. Then we used Packer, Ansible and EC2. We used Packer to create AWS images in the last tutorial.
System Memory Guidelines for Cassandra AWS Basic guidelines for AWS Cassandra Do not use less than 8GB of memory for the JVM. The more RAM the better. Use G1GC. SSTable are first stored in memory and then written to disk sequentially. The larger the SSTable the less scanning that needs to be done while reading and determining if a key is in an SSTable using a bloom filter. In the EC2 world this equates to an m4.
AWS Cassandra and NUMA The i3.8xlarge, c4.8xlarge, m4.10xlarge, and above EC2 instance types use more than 1 CPU, which means NUMA controls are available. A good read on this is from Al Tolbert’s blog post. The quickest way to tell if a machine is NUMA is to run “numactl –hardware”. -Al Tobey blog post on Cassandra tuning NUMA stands for Non-Uniform Memory Architecture. Modern x86 CPUs contain an integrated memory controller.
Cassandra CPU requirements in AWS Cloud Cassandra is highly concurrent. Cassandra nodes can uses as many CPU cores as available if configured correctly. What are vCPUs and ECUs? An Amazon EC2 vCPU is a hyper thread, often referred to as a virtual core. Think of it as a physical thread of execution. It is able to run one thread at a time (which of course could be swapped out).
Cassandra AWS Storage Requirements Cassandra does a lot sequential disk IO for the commit log and writing out SSTable. You still need random I/O for read operations. The more read operations that are cache misses, the more your EBS volumes need IOPS. Cassandra writes to four areas commit logs SSTable an index file a bloom filter Consider EC2 instance store instead of EBS for Cassandra AWS provides EC2 instance local storage called instance storage which is not available with all EC2 instance types, and Elastic Block Store (EBS).
What is Cassandra? Cassandra is a linearly scalable, open source NoSQL database. Cassandra uses log-structured merge-tree, which makes Cassandra one of the best NoSQL options for high-throughput writes. Cassandra delivers continuous availability, with operational simplicity. Unlike many other NoSQL solutions, Cassandra is a master-less, peer-to-peer, distributed clustered store. Each node knows about the cluster network topology via the gossip protocol. Cloudurable provides Cassandra training, Cassandra consulting, Cassandra support and helps setting up Cassandra clusters in AWS.
Cassandra Cluster Tutorial 3: Part 2 of 2 Setting up Ansible and SSH for our Cassandra Database Cluster for DevOps/DBA Tasks This tutorial series centers on how DevOps/DBA tasks with the Cassandra Database. As we mentioned before, Ansible and ssh are essential DevOps/DBA tools for common DBA/DevOps tasks whilst working with Cassandra Clusters. Please read part 1 before reading part 2. In part 1, we set up Ansible for our Cassandra Database Cluster to automate common DevOps/DBA tasks.
Cassandra Cluster Tutorial 3: Part 1 of 2 Setting up Ansible/SSH for our Cassandra Database Cluster for DevOps/DBA Tasks Ansible and ssh are essential DevOps/DBA tools for common DBA/DevOps tasks like managing backups, rolling upgrades to the Cassandra cluster in AWS/EC2, and so much more. An excellent aspect of Ansible is that it uses ssh, so you do not have to install an agent to use Ansible. This article series centers on how DevOps/DBA tasks with the Cassandra Database.
Cassandra Cluster Tutorial: Setting up Ansible for our Cassandra Database Cluster to do DevOps tasks
Cassandra Tutorial: Setting up Ansible for our Cassandra Database Cluster for DevOps/DBA tasks Ansible is an essential DevOps/DBA tool for managing backups and rolling upgrades to the Cassandra cluster in AWS/EC2. An excellent aspect of Ansible is that it uses ssh, so you do not have to install an agent to use Ansible. This article series centers on how DevOps/DBA tasks with the Cassandra Database. However the use of Ansible for DevOps/DBA transcends its use with the Cassandra Database so this article is good information for any DevOps/DBA or Developer that needs to manage groups of instances, boxes, hosts whether they be on-prem bare-metal, dev boxes, or in the Cloud.
Setting up client and cluster SSL transport for a Cassandra cluster This articles is a Cassandra tutorial on Cassandra setup for SSL and CQL clients, as well as installing Cassandra with SSL configured on a series of Linux servers. Cassandra allows you to secure the client transport (CQL) as well as the cluster transport (storage transport). SSL/TLS have some overhead. This is especially true in the JVM world which is not as performant for handling SSL/TLS unless you are using Netty/OpenSSl integration.
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