After applying as much as possible the DevOps principles for more than a year on the run of a highly business critical project of one of our customers, here are some golden rules we eventually found out and tried to stick with. Items are here presented from an Ops perspective.
Through this post I would like to share with you the continuous delivery chain that we’ve successfully set up. My point is to describe the whole chain (from the Svn check in to the feedback loop to get the deployment status) and highlight some tricks that we discovered.
In our context, we cannot speak about Continuous Delivery without addressing the DevOps approach that we clearly have in our teams. This approach gives the opportunity to share our needs and exchange points of views between the Developer and Operational teams. Some of the important points are described here.
So let’s check out how our DevOps team can build and deploy 7000 clients in 3 clicks.
As the Apache Hadoop ecosystem grows while its core matures, there are now several companies providing business-class Hadoop distribution and services. While EMC, after it acquires Greenplum, seem the biggest player other companies such as Cloudera or MapR are also competing.
This article introduces Datastax Brisk, an innovative Hadoop distribution that leverage Apache Hive data warehouse infrastructure on top of an HDFS-compatible storage layer, based on Cassandra. Brisk try to reconcile real-time applications with low-latency requirement (OLTP) and big data analytics (OLAP) in one system. “Oh really ?”
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It’s been a while since we last blogged about Apache Cassandra. Let’s catch up with the new features available from version 0.7+.
I’m starting today a new series of articles called Classical Issues. In it, I’ll address, one after the other, classical issues encountered through my software engineering years.
This first article is targeted to demystify computing and give some best practices for an enterprise application. By enterprise application, we mean an application working on things like money, prices and quantities. It will be in two parts. This one is about explaining the root of the problem. The second one will show how to handle it in Java and .Net.
Bill is developing a software doing commission payments. He needs to add 1.2$ to each transaction. He codes a method doing just that and the unit test coming along.
@Test
public void testAddCommission() {
double actual = addCommission(1000000.1);
assertEquals(1000001.3, actual, 0);
}
public static double addCommission(double nominal) {
return nominal + 1.2f;
}
java.lang.AssertionError: expected:<1000001.3> but was:<1000001.3000000477>
“Darn! It’s not working!”.
What’s going on?
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