Cluster Deployment

The following diagram shows the kind of architecture that is typical for a production system pre-10.3 release and post 10.3 release. With the 10.3 release, AgileApps uses the common Tomcat that comes along with the IS installation and does not use the stand-alone Tomcat anymore. This allows AgileApps access to the flow services on the co-hosted IS.

Architecture for pre-10.3 Release

Architecture for post-10.3 Release

The key points depicted in the diagram are:

• The platform is deployed across multiple servers.
• A Load Balancer distributes traffic across the web servers.
• Apache httpd is an optional front-end web server for the application server.
  Learn more: Installing and Configuring Apache for Use with the Platform
• The Messaging server handles all social media interactions .
  It also handles on-screen notifications when people are looking at the same case.

• Messages are exchanged between it and the application server to manage those interactions.
• HornetQ maintains the store-and-forward message queue for those communications.

Learn more: Installing the Messaging Server

• Memcached servers reduce response time by caching data in memory.
  Learn more: Configuring memcached
• The suite of memcached servers are accessed by all application servers, backend as well as front end.
• The critical backend processes shown here (import, export, and scheduling, which uses quartz) are all being run from a single platform instance. But additional servers can be employed, as load demands.
  Learn more: Managing Backend Services
• Document storage (which includes pictures and image files) is managed separately from the database.
• The database is running on its own server, for added performance.
  Learn more: Configuring MySQL to Run on a Separate Server
• The primary database instance and the replication instance are each running on separate servers, both for reliability and for performance of read-intensive operations.
  Learn more:

Using Replication with Different Master and Slave Storage Engines
http://dev.mysql.com/doc/refman/5.5/en/replication-solutions-diffengines.html

• Requests that access and update, whether coming from a user or a backend process, go to the primary database, while read-intensive operations (backups, reports, exports) are executed on the replicated database.
  Learn more: Running Reports and Storage Checks On a Replicated Database Server.