Cassandra

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Cassandra: An Insights of G1GC log

This is the third post related to Garbage Collection in Cassandra. In this post we will discuss how to read G1GC log. I have already posted about enabling G1GC log in previous post. Minor GC Event:- Whenever a minor GC events occured, gc log prints below.  2020-03-13T16:15:03.803-0500: 18.259: [GC pauseRead More

Cassandra 3.0 or later: Enable GC logging

  This is the second post related to Garbage Collection in Cassandra. In this post we will discuss how can we enable GC logging with G1 or CMS Garbage Collector. I already discussed pros/cons of G1/CMS Garbage Collector in previous post. To enable the GC logs, and other parameters relatedRead More

Cassandra: Garbage Collector Introduction

In this blog post we will discuss about Garbage Collection with respect to Cassandra 3.0 or later. Optimizing Garbage Collection is very important in Cassandra. It can improve performance ~5 times performance and save huge money. What is Garbage Collection? Garbage collection also known as GC is an important featureRead More

Amazon Managed Cassandra Service(MCS)

  AWS Announced Amazon Managed (Apache) Cassandra Service (MCS):- AWS confirmed Amazon Managed Apache Cassandra Service (MCS) at AWS: reinvent 3rd Dec’19. Amazon Managed Cassandra Service provides high availability, scalability and Apache Cassandra compatible database service which is also server-less. AWS has many customers who asked to have managed CassandraRead More

WARN : “Mutation of xxx bytes is too large for the maximum size of xxx”

  In this blog post, we will explain the error of “Mutation of xxx bytes is too large for the maximum size of xxx”. Recently, we encountered an error(WARN) “Mutation of 17156436 bytes is too large for the maximum size of 16777216”. To understand the above error, we should know whatRead More

How Cassandra Reads the data?

  To Satisfy read/write request, it must achieve consistency level (whatever we define, either CL = 1, 2 or Quorum. To know more, please check consistency level). To complete the read request, Cassandra combine the request set of active MemTable and SSTables. Cassandra fetch data from multiple stages to discoverRead More

How Cassandra Writes Data?

How can we say Data has been written successfully? Cassandra writes data in 4 stages. When Application send request to write data, there is a coordinator which actually hash the data( it’s partitioner role) and create a token and then coordinator identify this token range belongs to which node and itRead More

Migration of MySql Tables to Cassandra table

In this section, we will let you know how to migrate MySql table to Cassandra table. 1. Create database in MySql. create database mysql_to_cassandra ; 2. Create table in MySql. CREATE TABLE `history` (  `id` varchar(30) DEFAULT NULL,  `city` varchar(30) DEFAULT NULL,  `province` varchar(30) DEFAULT NULL,  `country` varchar(30) DEFAULT NULL, Read More

Cassandra

Cassandra is a distributed database from Apache that is highly scalable and designed to manage very large amounts of structured data. It provides high availability with no single point of failure. The tutorial starts off with a basic introduction of Cassandra followed by its architecture, installation, and important classes andRead More