Cloud system fasten application processing and reduces memory usage by running multiple applications together within a single multitenant JVM. According to cloud providers, there are two popular multitenant architectures – shared or no shared multitenant architectures. For the shared architecture, underlying hardware and software will be same. In case of no shared multitenant architecture, the complete set of hardware and software is fully dedicated to single customer only. Obviously, in shared architecture the overall cost involved is a lot lesser.
There are two main dimensions associated with multitenant JVM spectrum – Density and isolation. Density implies how many applications and services can be shared for a particular set of hardware and software. Higher the density, lower will be the provider’s cost. Sadly, increased density reduces the level of isolation between multiple tenants or applications being shared.
For java based applications, sharing JVM saves both processing time and memory. For the traditional java versions, sharing JVM implies losing isolation between tenants. For the top level applications, it is necessary to maintain the isolation level up to a certain limit. The problem has been removed with latest IBM’s Java 8 beta version where excellent isolation level can be maintained during JVM sharing.
Till now, we have discussed about benefits and general concept of JVM in IBM's Java 8 beta version. We know isolation can be achieved with this wonderful invention. But the question is how isolation is achieved technically. It can be done in two ways –static field isolation and resource constraints.
Through static field isolation concept, each tenant has access to its data fields only. In case, it tries to access other data fields, it'll receive an error message. With the resource constraints concept, shared resources can be used perfectly. By implementing both these fields during Java development, it is possible to provide better isolation between applications and services being shared.
In the above blog, we have discussed about multitenant JVM and its benefits. We believe that this will help the programmers dealing with Java development in India and worldwide. The concept has significant cost-benefits to providers when used appropriately in right environment. For more information related to latest java updates, stay tuned with us and don’t forget to share your experience when implementing multitenant concept for your Java projects.
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