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developers
30 September, 2013

Tools for Testing Cassandra

Authors: Ryan McGuire

I have a background in software development, not QA. When I started at DataStax, as a test engineer for Cassandra, I was new to both Cassandra and testing strategies in general. I'd…

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developers
13 September, 2013

A short troubleshooting guide to OpsCenter

Authors: Erin Moy
OpsCenter

Hi my name is Erin and I’m a QA engineer. I’ve been on the OpsCenter team for the last 6 months or so and these are some problems I’ve encountered and their possible solutions.…

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developers
11 September, 2013

Improvements on the driver side with Cassandra 2.0

Authors: Michaël Figuière
Releases

CQL has been tagged production ready in Cassandra 1.2, it came along with the CQL Native Protocol, a client protocol designed as a replacement for Thrift which was traditionally…

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developers
3 September, 2013

Streaming in Cassandra 2.0

Authors: Yuki Morishita
Releases

“Streaming” is a component which handles data (part of SSTable file) exchange among nodes in the cluster. When you bootstrap a new node, it gets data from existing nodes using…

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developers
3 September, 2013

What’s under the hood in Cassandra 2.0

Authors: Jonathan Ellis

The headlining features in 2.0 are lightweight transactions, CQL enhancements, and triggers. But 2.0 also features a lot of internal optimizations and improvements! Performance…

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developers
1 September, 2013

Why Cassandra doesn’t need vector clocks

Authors: Jonathan Ellis

One of the notable features of Amazon's 2007 Dynamo paper was the use of vector clocks for conflict resolution. However, the two most prominent systems designed by engineers who…

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developers
31 August, 2013

What’s New in Cassandra 2.0: Prototype Triggers Support

Authors: Aleksey Yeschenko

Warning: as of Cassandra 2.0.0, the ITrigger interface and the rest of the triggers implementation are not final - and will change in 2.1. Please be aware of this before using…

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27 August, 2013

Cassandra and Pig Tutorial

Authors:

Exploring Data in Cassandra using Pig with DataStax Enterprise 3.1 Introduction Often my wife and I like to play a a little guessing game. One of us will think up an odd question…

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7 August, 2013

OpsCenter: An Architecture Overview

Authors:
Architecture, OpsCenter

OpsCenter is a great tool for managing and monitoring your Cassandra and DataStax Enterprise clusters. In this post we'll dive a bit deeper into the architecture to get a better…

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developers
5 August, 2013

Apache Cassandra™ Log Viewing with gltail

Authors: Sven Delmas

gltail by Erlend Simonsen is a real time log viewer written in Ruby that provides an interesting live view of your log data from multiple servers. Log entries are assigned to blocks…

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developers
26 July, 2013

CQL improvements in Cassandra 2.0

Authors: Sylvain Lebresne

At the time of this writing, Cassandra 2.0.0-beta2 has just been released and it shouldn't be too long before the final lands. In this blog post, we will describe the improvements…

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developers
25 July, 2013

Developing a Domain Specific Language in Gremlin

Authors: Stephen Mallette
Gremlin

Domain Specific Languages (DSLs) provide a way for programmers to increase the expressivity of their code within a specific domain. It enables the developer to gain greater…

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developers
24 July, 2013

Advanced repair techniques

Authors: Brandon Williams
Apache Cassandra™

Anti-entropy repair in Cassandra can sometimes be a pain point for those doing deletes in their cluster, since it must be run before gc_grace expires to ensure deleted data is not…

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developers
23 July, 2013

Lightweight transactions in Cassandra 2.0

Authors: Jonathan Ellis

Background When discussing the tradeoffs between availability and consistency, we say that a distributed system exhibits strong consistency when a reader will always see the most…

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developers
22 July, 2013

Support CQL3 tables in Hadoop, Pig and Hive

Authors: Alex Liu

The evolutions of Cassandra querying mechanism   Thrift API   The first generation is through the thrift API such as batch_mutate, get, get_slice, insert, multiget_slice, remove…

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developers
16 July, 2013

Look Ma! No ETL!

Authors: Hamilton Tran

Introduction Solr and Hadoop are two big open source technologies that we have integrated in DataStax Enterprise on top of Cassandra. For those just joining us, Solr allows for…

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developers
10 July, 2013

QA starter’s guide to Cassandra

Authors: Cathy Daw
Apache Cassandra™

Since the beginning of 2013, we've done a lot of hiring for the Test Engineering organization here at DataStax. During the on-boarding process, I've found myself giving the…

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developers
5 June, 2013

Does CQL support dynamic columns / wide rows?

Authors: Jonathan Ellis

The transition to CQL has been tough for some people who were used to the existing Thrift-based data model. A common misunderstanding is that CQL does not support dynamic columns or…

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developers
13 May, 2013

Educating the Planet with Pearson

Authors: Marko A. Rodriguez

Pearson is striving to accomplish the ambitious goal of providing an education to anyone, anywhere on the planet. New data processing technologies and theories in education are…

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developers
10 May, 2013

Using the DataStax ODBC Driver for Apache Cassandra

Authors: Robin Schumacher

DataStax is pleased to make available an ODBC driver for Apache Cassandra that can be used free of charge with both open source Cassandra and DataStax Enterprise. Using the DataStax…

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developers
9 May, 2013

Free ODBC Drivers for Cassandra and Hadoop Now Available

Authors: Robin Schumacher
Releases

I’m pleased to let you know that we’re now providing free ODBC drivers for Hadoop/Hive as well as Cassandra. Our ODBC driver for Hive has been available for a while now, however…

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developers
9 May, 2013

DataStax Java Driver: A new face for Cassandra

Authors: Michaël Figuière
Java

Cassandra has always benefited from a great architecture, thought from the very beginning for scalability, performance and availability. This is surely what has driven its…

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developers
26 April, 2013

Cassandra anti-patterns: Queues and queue-like datasets

Authors: Aleksey Yeschenko
Apache Cassandra™

Deletes in Cassandra Cassandra uses a log-structured storage engine. Because of this, deletes do not remove the rows and columns immediately and in-place. Instead, Cassandra writes…

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developers
19 April, 2013

Counting Keys In Cassandra

Authors: Richard Low
Apache Cassandra™

Today a colleague asked me: how can I find out how many keys I just inserted into Cassandra? You’d expect any half-decent database to be able to tell you how much stuff it has got.…

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