Cleartrip accelerates application, reduces cost through Citrix NetScaler

Launched in July 2006, Cleartrip is one of the leading online travel companies in India. Based on a straight forward premise of “making travel simple” for its customers, it achieves this with a clean and clutter free website, a site that is fast to load, quick in providing relevant information, simple to navigate and offering an easy booking process. Cleartrip works with its extensive customer base through a variety of key channels, a dedicated consumer website, Agent Box an exclusive tool targeting India's large agency base, Cleartrip Mobile the sexiest, most comprehensive travel product available on a mobile phone today, and Cleartrip for Business an online corporate travel management tool.

The Challenge: Addressing growth and enhancing application availability

At the time of its launch, Cleartrip had deployed solutions from other solution providers. However, the application delivery controller crashed just two days before the launch.

“Fortunately our ISP had a spare Citrix NetScaler available and we decided to launch the portal using it,” says Sanjeev Sreedharan, VP, Software Engineering, Cleartrip.

The initial deployment of Citrix NetScaler was, therefore, a result of the urgency of the situation. However, it wasn't late before the company ran into fresh challenges arising out of fast growth and expansion.

“Cleartrip's fast growth was proving to be a challenge for the IT infrastructure. As the organization started growing in terms of traffic, number of products, geographies and the number of applications supported internally, we needed to scale tremendously,” says Sreedharan. “It was a multidimensional scaling challenge that was to be addressed.”

Being a start-up, keeping costs low was one of the top priorities as well as a challenge for the company.

“Another key concern was to keep costs under control. Anything above zero was a cost for a start up like us. It was for this reason that we wanted to minimize the need for IT infrastructure, while at the same time take care of the traffic spike,” informs Sreedharan.

This time, Cleartrip decided to do a product evaluation before implementing a solution.

The Solution: Implementing Citrix NetScaler

After doing a comprehensive evaluation, Cleartrip decided to stick with Citrix NetScaler. As Sreedharan says, “Citrix was not the cheapest solution available in the market. However, for us it was not about how much it costs, but about going with The challenge: Addressing growth and enhancing application availability Implementing Citrix NetScaler Cleartrip Case Study 3 the right cost. At the end of the day, we are an online business and if we are not able to deliver our online portal, it is as good as not being in business. Therefore, we thought it made sense to pay a little bit extra for the stability factor,” he says.

“Ultimately we decided to continue with Citrix as a platform because it delivered all the required functionality in a single device along with its ease of management, scalability, stability, and the kind of support ecosystem available for it,” Sreedharan says. Cleartrip deployed Citrix NetScaler 10500 platform.

As Cleartrip further scaled up, it wanted redundancy and went on to deploy yet another box of Citrix NetScaler in a high availability facility. Two years back, both the boxes were upgraded onto an MPLS platform. Both the Citrix NetScaler boxes are currently deployed in its Mumbai data center.

“We wanted to start a second data center for business continuity. We decided to stay with Citrix, and have already placed an order for the third box,” says Sreedharan. Cleartrip's primary data center is in Mumbai, and the second one is expected to come up in Chennai. The new order would see Cleartrip deploying Citrix NetScaler 11500.

Sreedharan worked closely with Citrix's partner, SK International, in migrating from the old platform to the new platform. According to him the support provided by the partner and Citrix was very good.

“They (SK International) were hand-in-hand in migrating from the old platform to the new one. Their technical team was extremely supportive and were well versed with the technical details of the platform. This strong support system was one of the reasons why we chose Citric over others. The Citrix sales team was also very good. There have been times when we faced budgetary issues and luckily we found them to come forward and help us,” Sreedharan informs.

Reaping multiple benefits

With the deployment of Citrix NetScaler, Cleartrip has been able to overcome lot of the scaling challenges that it faced. Today, the portal receives around four million unique visitors per month. 

“We now have an accelerated application performance. Had we not deployed Citrix NetScaler, there would have been additional infrastructure required to support the same traffic, which would have increased costs for us,” Sreedharan says. “Also we managed to save lot of our engineering efforts in addressing the scalability issues. Citrix NetScaler is easy to manage both at the command prompts and as well as GUI levels.” 

“Some of the other features of the NetScaler such as multiplexing and SSL offloading have also helped us a lot,” he adds. 

Citrix NetScaler has also enabled Sreedharan to perform several infrastructural engineering procedures. 

“We do a lot of infrastructural engineering on the NetScaler. For instance, we do throttling to ensure that the application stays in the performance benchmark. We are moving into the private cloud platform and are implementing at an automation platform for performing auto scaling. So the usage of Citrix NetScaler is extensive,” he informs.

Cleartrip is now working on cloud adoption and automation. “Citrix NetScaler is also at the heart of auto scaling and auto healing,” Sreedharan adds.

About Citrix

Citrix Systems, Inc. (NASDAQ:CTXS) is a leading provider of virtual computing solutions that help companies deliver IT as an on-demand service. Founded in 1989, Citrix combines virtualization, networking and cloud computing technologies into a full portfolio of products that enable virtual workstyles for users and virtual datacenters for IT. More than 230,000 organizations worldwide rely on Citrix to help them build simpler and more cost-effective IT environments. Citrix partners with over 10,000 companies in more than 100 countries. Annual revenue in 2010 was $1.87 billion.

©2012 Citrix Systems, Inc. All rights reserved. Citrix®, NetScaler® and Citrix Application FirewallTM are trademarks of Citrix Systems, Inc. and/or one or more of its subsidiaries, and may be registered in the United States Patent and Trademark Office and in the other countries. All other trademarks and registered trademarks are the property of their respective owners.

We now have an accelerated application performance. Had we not deployed Citrix NetScaler, there would have been additional infrastructure and engineering efforts required to support the same traffic, which would have increased costs for us.
- Sanjeev Sreedharan

VP, Software Engineering



  • Travel

Key Benefits

  • Enhances application acceleration
  • No additional infrastructure needed at backend to handle traffic spike
  • Easy manageability

Citrix Product