nosql

Amazon ES – Secure your cluster from anonymous users! #2

In the previous blog, we have learned how to create a domain on Amazon ES and also how to create an index using Curl on the cluster. Now, let’s just look how we can control access to Amazon ES Domain. One of the key benefits of using Amazon ES is that you can utilize AWS Identity and Access Management (IAM) to control access to your Continue Reading

The curious case of Cassandra Reads

In our previous blog, we discovered how Cassandra handles its write queries. Now it’s time to understand how it ensures all the read requests are fulfilled. Let’s first have an overall view of Cassandra. Apache Cassandra is a free and open-source distributed NoSQL database management system designed to handle large amounts of data across many commodity servers, providing high availability with no single point of Continue Reading

Cassandra Writes: A Mystery?

Apache Cassandra is a free and open-source distributed NoSQL database management system designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure. It is a peer to peer database where each node in the cluster constantly communicates with each other to share and receive information (node status, data ranges and so on). There is no Continue Reading

Simple Things You Can Learn From Cassandra Nodetool (Monitor/Manage) For DC/OS

Cassandra native tool called nodetool is used for monitoring and managing cassandra cluster for dcos

Data modeling in Cassandra

Role of Partitioning & Clustering Keys in Cassandra Primary and Clustering Keys should be one of the very first things you learn about when modeling Cassandra data.  With this post I will cover what the different types of Primary Keys are, how they can be used, what their purpose is, and how they affect your queries. Primary key Primary Keys are defined when you create Continue Reading

Business Intelligence-Data Visualization: Tableau

Spark, Bigdata, NoSQL, Hadoop are some of the most using and top in charts technologies that we frequently use in Knoldus, when these terms used than one thing comes into picture is ‘Huge Data, millions/billions of records’ Knoldus developers use these terms frequently, managing (and managing means here- storing data, rectifying data, normalizing it, cleaning it and much more) such amount of data is really Continue Reading

Cassandra Counter Column And Table

Blog Describes the usage of counter column and table in Cassandra .

Cassandra Data Modeling – Primary , Clustering , Partition , Compound Keys

In this post we are going to discuss more about different keys available in Cassandra . Primary key concept in Cassandra is different from Relational databases. Therefore it is worth spending time to understand this concept. Lets take an example and create a student table which had a student_id as a primary key column. 1) primary key  create table person (student_id int primary key, fname Continue Reading

Apache spark + cassandra: Basic steps to install and configure cassandra and use it with apache spark with example

To build an application using apache spark and cassandra you can use the datastax spark-cassandra-connector to communicate with spark. Before we are going to communicate with spark using connector we should know how to configure cassandra. So following are prerequisite to run example smoothly. Following steps to install and configure cassandra If you are new to cassandra first we nee to install cassandra on our Continue Reading

Solution for Riak 500 Internal Server Error

I am new to Riak and learning it. Few days ago, I got 500 Internal Server Error exception while inserting data in a Riak bucket. It was weird because I was able to insert same data in different bucket. I tried to find out root cause, but didn’t get success. After beating my head whole day, I posted it on Roak forum and stackoverflow. I Continue Reading

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