Nivash Srinivasa Ragavan

Implemented the look up part of the Ceph File system. Developed the CephClient (which involves caching of the OSD Cluster Map, compute the OSDs in which the replicas of a file are read from or written to), CephMonitor (which takes care of maintaining the master copy of the OSD Cluster Map. The implementation consisted of multiple monitors so that the other monitors can pick up in case one of them went down. LoadBalancing, adding and failure of a node using heartbeat scheduling were also… Show more

Implemented the look up part of the Ceph File system. Developed the CephClient (which involves caching of the OSD Cluster Map, compute the OSDs in which the replicas of a file are read from or written to), CephMonitor (which takes care of maintaining the master copy of the OSD Cluster Map. The implementation consisted of multiple monitors so that the other monitors can pick up in case one of them went down. LoadBalancing, adding and failure of a node using heartbeat scheduling were also performed by the monitor), FileReadWrite Servers (The server running on the OSDs which listen for requests from the client for read or write. This also records the load of the server to report to the monitor in case it exceeds the specified threshold). This also had a distributed FileBackupServer which maintains the list of files in each OSD to help in case of failure since this does not have a complete MDS server. Performance study of the system was done with 20 OSDs and over 1 million files for each test. Show less

The system has knowledge of the map of a city, location of various emergency responders, location of traffic signals and the density of traffic in the roads. Based on the incident reported, finds the appropriate responders, intimates them and provides them with the route to reach the location of the emergency in the shortest time taking into account the change in signals and the traffic along various routes. The knowledge store is implemented using RDF and informed search is used as a part of… Show more

The system has knowledge of the map of a city, location of various emergency responders, location of traffic signals and the density of traffic in the roads. Based on the incident reported, finds the appropriate responders, intimates them and provides them with the route to reach the location of the emergency in the shortest time taking into account the change in signals and the traffic along various routes. The knowledge store is implemented using RDF and informed search is used as a part of the algorithm Show less

Implemented for a competition. The application takes input from a web-service URL and sends guesses to the same URL. Can also be used to find words which contain special characters(such as ',-,,(comma)). Apart from taking the length into account, the algorithm also uses the frequency of letters to find the most appropriate character. With 5 tries, the algorithm guessed the correct result in 95% of the cases.

Barrel Race is an Android Game that uses the sensors on the device (mainly accelerometer). This is similar to the barrel race, a rodeo event in which the rider starts at a gate, rides completely around three barrels and comes back to the start gate. The object is to get the fastest time without knocking over any of the barrels. Hitting the fences around the course will add a penalty of 5 seconds to your time.

Developed a 3D file system interface that dynamically accesses files and folders.

Worked on the upgrade Certification on WebCenter Portal 11.1.1.9.0. I worked on automating the install and upgrade of the product on various scenarios which reduced the turnaround time for testing from about a week to less than 12 hours.

Worked on the Upgrade Certification of WebCenter Portal to 11.1.1.8.0. This involved certifying the install and upgrade on Linux, Windows using databases Oracle DB, MySQL, SQL Server, DB2 and on application servers Oracle Weblogic Server and IBM WebSphere Server in standalone and enterprise configurations. For this I had to collaborate with more than 10 teams around the world to figure out the requirements of each team and make sure the environment was stable for all testing needs.

Pragyan CMS is a full-fledged multi-user, modular Content Management System (CMS) to organize & facilitate collaborative content creation & updation on a website and its administration. It is written completely in PHP and supports MySQL databases. It has a strong custom inbuilt framework with independent components like templates, modules and widgets. It comes pre-packaged with a large number of modules like article, form, quiz, forum, gallery, book, news, poll, etc, widgets like image slider… Show more

Pragyan CMS is a full-fledged multi-user, modular Content Management System (CMS) to organize & facilitate collaborative content creation & updation on a website and its administration. It is written completely in PHP and supports MySQL databases. It has a strong custom inbuilt framework with independent components like templates, modules and widgets. It comes pre-packaged with a large number of modules like article, form, quiz, forum, gallery, book, news, poll, etc, widgets like image slider, facebook plugins, page hits counter, news flash etc and third-party plugins like PDF converter, google maps, sphider search engine, etc. It also provides tools to organize and manage permissions for users and groups. Show less

Implemented different algorithms for the encryption, signing and certificate of XML documents that are transferred over the internet. Created an application that manages the keys of various users, transfers data securely over the internet, takes care of encrypting, decrypting, signing, verifying of the data sent and received. The application was built in Java using Swing for the GUI, JBDC for database connectivity, JDOM for XML parsing and MySQL as the database server.

Developed a distributed port scanner consisting of a server and an extendable number of clients to that can be used to find vulnerable ports in a server, thus evading the detection by intrusion scan detectors.