title: How to rollback MicroServices
body: <p>I have doubt related to MicroServices. Suppose there are 5 Micro-Services, lets say M1, M2, M3, M3, M4 and M5. There are 4 databases which are connected/accessed by 4 micro-services.
  For example, M2 connected to MySQL, M3 connected to Cassandra, M4 connected to MongoDB and M5 connected to Oracle.</p>
  <p>Now</p>
  <p><strong>Step-1:</strong> M1 making a call to M2 to update some user data in MySQL and it updated successfully then finally it got success response from M2</p>
  <p><strong>Step-2:</strong> M1 making a call to M3 to update some data in Cassandra and it updated successfully then finally it got success response from M3</p>
  <p><strong>Step-3:</strong> M1 making a call to M4 to update some data in MongoDB and it failed due to some DB server problem or any other problem.</p>
  <p>Here my requirement is, I want to rollback DB changes that happened to previous micro-services(M2 and M3)</p>
  <p>What should we need to do to achieve this kind of rollback scenario?</p>