Category Archives: Cassandra

Reading Nested Objects Modeled with Composite Key from Cassandra

Posted on December 15, 2013 by Pranab

My earlier post was about storing nested objects modeled with composite key in Cassandra. Well, we need to be able to read the data back as objects and that’s the topic for this post. This post will focus on rest … Continue reading →

Posted in Big Data, Cassandra, Data Model, NOSQL | Tagged | 2 Comments

Storing Nested Objects in Cassandra with Composite Columns

Posted on July 14, 2013 by Pranab

One of the popular features of MongoDB is the ability to store arbitrarily nested objects and be able to index on any nested field. In this post I will show how to store nested objects in Cassandra using composite columns. … Continue reading →

Posted in Big Data, Cassandra, Data Model, NOSQL | Tagged , , , | 19 Comments

Cassandra Range Query Made Simple

Posted on March 4, 2012 by Pranab

In Cassandra, rows are hash partitioned  by default. If you want to data sorted by some attribute, column name sorting feature of Cassandra is usually exploited. If you look at the Cassandra slice range API, you will find that you … Continue reading →

Posted in Cassandra, NOSQL | Tagged , , | 7 Comments

Data Loader for NOSQL Databases

Posted on August 31, 2011 by Pranab

In one of my recent projects, I had to load product data from a CSV file into HBase and also to index it for search purpose.. I decided to separate out the loader part of the project as a stand … Continue reading →

Posted in Cassandra, HBase, Indexing, NOSQL | Tagged , , , | 3 Comments

Cassandra Secondary Index Patterns

Posted on March 2, 2011 by Pranab

We all know that any real application needs to do query based on attributes other than the primary key or row key in case of Cassandra. Cassandra version .7 onwards provides native secondary index support. But there are several limitations. … Continue reading →

Posted in Cassandra, Indexing, NOSQL | Tagged , | 8 Comments

Easy Cassandra Data Access

Posted on December 11, 2010 by Pranab

This post is about a simple no nonsense data access API for Cassandra. I did not start with a grandiose plan for yet another high level Cassandra API. I was implementing a Cassandra based BPM that I blogged about earlier. … Continue reading →

Posted in Cassandra, Java, NOSQL | Tagged , | 4 Comments

Cassandra secondary index to the rescue

Posted on October 2, 2010 by Pranab

In an earlier blog, I discussed Cassandra data model for a BPM system. I used an eCommerce order processing system driven by a BPM as an example. In this post, we will discuss some of the data access usage scenario … Continue reading →

Posted in Cassandra, Indexing, NOSQL | Tagged , , , | 1 Comment

Roll out your own BPM with some help from Cassandra (Part 2)

Posted on September 19, 2010 by Pranab

In Part 1 we talked about BPM architecture in  general. My focus in this post will be a data model for our BPM using Cassandra. Well, you might ask why not stick with MySQL that we all love. Why Cassandra … Continue reading →

Posted in BPM, Cassandra, Data Model, NOSQL | Tagged , , | 2 Comments

Roll out your own BPM with some help from Cassandra (Part 1)

Posted on September 6, 2010 by Pranab

BPM stands for Business Process Management. In simple terms it’s a framework for managing long running business transaction. A long running business transaction manages a business process e.g., order processing in a eCommerce web site. A business process is generally … Continue reading →

Posted in BPM, Cassandra, eCommerce, NOSQL | 1 Comment

Cassandra and Hadoop

Posted on August 2, 2010 by Pranab

I was always interested in mining patterns and knowledge from data. While working on a data mining project some time ago, I ran into a road block when dealing with very large data set. Most data mining algorithms are monolithic … Continue reading →

Posted in Cassandra, Hadoop and Map Reduce, NOSQL | Tagged , | 1 Comment