Reflections

A multi-tenant application is an application where a single running instance serves many customers. An alternative to multi-tenancy is managed services, where one running instance is set up for each customer. The table below shows a comparison between the two approaches. Feature Multi-Tenant Application Managed Services Cost Structure Supports usage based pricing as well as … Continue reading →

SaaS is the cutting edge technology in the current product landscape. With an increase in the adoption of SaaS products by enterprises, more and more ISVs are trying the SaaS delivery channel. But, delivering a SaaS product cannot be considered as just a rebranding exercise of existing products. Products mostly have been architected, written, refined … Continue reading →

We recently ran into the “java.lang.OutOfMemory: PermGen space” issue. The experience has been a real eye opener.  In SMART we use Classloader isolation to isolate multiple tenants. We started testing it in beta a few weeks back and found that every 2 days our server went down giving OutOfMemory: PermGen space. We had 6 tenants … Continue reading →

Queues are FIFO data structures that hold elements in the order they are received for processing. There are typically two ways in which queues can be processed. One method is by polling and the second method is by blocking. In polling, the queue is polled frequently for messages till one is got, while in the … Continue reading →

As everyone knows, threadpools allow us to schedule work on a set of threads which execute the work as and when a thread becomes available for processing the work. This is used for asynchronous processing. But what if the work has to do asynchronous operations? Is it wise to tie up the thread and put … Continue reading →