Romesh Malinga Perera

Split brain issue in elasticsearch- 2 node Cassandra For Titan graph database

by Romesh Maling Perera
April 3, 2015April 3, 2015

I recently configured a 2-node Cassandra cluster with elastic search installed in both nodes creating another 2-node cluster (Cassandra cluster was built using DataStax OpsCenter). Soon after I configured my cluster, I got to know that there are x + 1 issues when we try to get it done with only 2 nodes.

Split brain problem in elastic search

When there are, 2 or more nodes acting like master nodes we call it a split brain. This can happen when one node does not know that it is connected to a cluster with a master. When there is more than 1 master, indexing requests will be completed by both nodes and after some time two copies of the shard are diverged. We might have to do full re-indexing to overcome this issue. If you need more information about the split-brain problem here.

Building a Cassandra cluster with dataStax OpsCenter [CentOs]

by Romesh Maling Perera
April 3, 2015August 25, 2020

Building a cassendra cluster with dataStax OpsCenter

If you have tried creating a cluster though OpsCenter and failed, do not worry, seems like no one gets it in the first try. When we went through the installation process, we observed that there are issues when installing the dataStax agents though OpsCenter. In addition, we faced lot of issues while installing them. After doing it for several times I came to an agreement with myself of the easiest and working way to install agents and OpsCenter. If you are facing similar issues this article might give you some other options to tryout.

Issues we faced

OpsCenter cannot create dataStax agents in the cluster nodes [Cluster provisioning failed: Exception: Installation stage failed]
OpsCenter cannot connect to the agent installed in other nodes [There was a problem verifying an ssh login]
OpsCenter cannot connect to the own node with loopback address
OpsCenter cannot reconnect to nodes once restated the cluster
OpsCenter cannot connect to nodes with public IPs
DataStax agent not running on the node
Keep getting message about an old node, which is removed, is running [OpsCenter agent is still running on an old node that was decommissioned or is part of a cluster that OpsCenter is no longer monitoring].

by Romesh Maling Perera
January 24, 2015

If you have an old website or a web application with some user-base and you have encrypted user passwords with md5, sha1, sha256, etc. With the knowledge about md5 or that, old hashing techniques been compromised with brute force attacks, collision attacks, etc., you are searching for a way to convert your hashing technique to something more secure like bcrypt or crypt_blowfish. This article talks about how to do that.

Joomla enters the world of FREE hosted websites on JOOMLA.COM

by Romesh Maling Perera
January 22, 2015January 22, 2015

Joomla is known as one of the most popular open source content management systems (CMS) in business. WordPress, which is another popular CSM, was in the business of providing FREE but restricted hosting for WordPress based sites under WORDPRESS.COM domain. This WordPress service has been known for higher positions in Google page rankings and higher visitor turnarounds.

Recently (actually on January 20, 2015) Joomla has started providing the same service in lesser-restricted way. By providing an option to have a free-hosted website for unlimited time, Joomla aims to become even more popular and substantially increase its user base.

Developing “Keep Me Logged In” / “Remember me” / “Stay signed in”option

by Romesh Maling Perera
January 21, 2015January 21, 2015
1 Comment

I recently had to develop above feature couple of times in past few weeks. I came across several issues while implementing this feature. Most of these issues did not have any thing do with the programming language I used (i.e. they are not implementation related issues) but had to do with the concept of development (i.e. design issues). As these are concept level issues, I can make this article more abstract and do not have to couple with a programming language I used (PHP). However will show some code segments in PHP + pseudo, which will be very basic and can be easily translated to any other language.

First, I must emphasize that this method is based on one basic idea. “DO NOT PUT USER DATA IN COOKIE”, even in encrypted format. If you are OK with putting some user data in the cookie, because you believe that encryption cannot be broken or the information is useless to an attacker, jump to the “Not Recommended but Easy Solution” section at the end of the article

Pomodoro Technique for Learning

by Romesh Maling Perera
January 9, 2015January 10, 2015

I have to know about this technique when I was a university student. It worked really well for me and therefor I thought of sharing with the readers. This technique talks about taking small breaks in between work sprints.

A “pomodoro” kitchen timer, after which the method is named

What do you need?

A timer (If you cannot find it get a watch)
Notebook
Your learning material

How to use tooltip shape feature in the highchart version 4

by Romesh Maling Perera
December 16, 2014December 16, 2014

This article is going to talk about the tooltip shape feature in the Highcharts version 4 (And what are the available values for shape parameter). In early Highcharts versions tooltip shape is always rectangular. With this new feature, user can choose between few shapes that are defined in Highcharts. At… Read More »How to use tooltip shape feature in the highchart version 4

How social media factors and weather variations can influence business

by Romesh Maling Perera
November 15, 2014November 15, 2014

Leapset Software Engineers, Sasinda Premaratne and Malinga Perera took over this Friday’s Innovation Session with a discussion on ‘Connecting the Dots.’ They talked about how social media factors and weather variations can influence business, and how Leapset’s analytics solution ‘Leapset Insights’ takes these influences into account in order to help… Read More »How social media factors and weather variations can influence business

What to check after building a brand new website [New WebSite Checklist]

by Romesh Maling Perera
June 12, 2014

Once you have built a brand new site for anything, you might need to check on some general things that improve the site quality, maintainability and usability. As an example, did you place the author tag in your site (Google Rich Snippets )? Have you created a beautiful 404 page? Have you configured traffic analytical engine? You might forget some of these. Therefore, I decided to create a small checklist.

Tire One (If you forget these you might be in trouble)

You need to choose between www subdomain and bare domain (www.malinga.me vs. malinga.me). After deciding make sure, you build the other and redirected to your favorite domain.
Always test in all major browsers and screen resolutions
Always have a site search
Use readable (Human and SEO friendly) URLs
Verify your robots.txt and have a site map
Use security tools to assess any vulnerability (OWASP cheat sheet)

« Previous
1
…
3
4
5
6
Next »