This article explains on how a Mule ESB Cluster Setup can be tested successfully along with MYSQL database. When multiple Mule ESB nodes are configured in a cluster, it is essential to test the cluster in order to make sure that the setup is correct and functioning well.
Mule ESB cluster is used for load balancing and high availability. In case of Mule ESB hosting http services, a load balancer can be used to route the traffic in active-active mode.
As the test application has an http inbound end point to receive requests, it is necessary to establish a reliable acquisition flow so that if there any case of node failure, the request which is present in the persistent JMS queue can be served by other node in the cluster (or) the client which has received an error response needs to resend the request. In this way, message loss can be controlled.
Application logic flow inserts each request into LOG table with details of request id, time of log and mule server host name from which the log is written.
If there is any exception in the application logic (in case of database down), the message is moved to dead letter queue.
A test client can be used (for e.g. a Java program/SOAP UI client) to send the requests with different requestId parameter to the load balancer URL which will in turn route the traffic to mule cluster in active-active mode.
Test cases for different scenarios
| Test case | Expected Result |
| Run the test with all servers online ( by sending around 1000 requests) | Total count of received requests on ESB Node 1 and ESB Node 2 from database logs is 1000. Total number of received messages in Active MQ is 1000 |
| Shutdown Mule ESB Node 1 and run the test again | Total count of received requests on ESB Node 2 from database logs should be 1000. Total number of received messages in Active MQ should be 1000 |
| Bring back Node 1 | |
| Start the test load, after sending some requests ( say 200 ), shut down MuleESB Node2 | Total count of received requests on ESB Node 1 and ESB 2 from database logs + Failed response to client, should be 1000; Total number of received messages in Active MQ + Failed responses to client should be 1000 |
| Bring back Node 2 |
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Other useful links:
API Recipes with MuleSoft Anypoint Platform