In clustered environments when we deploy a composite which is using a DB adapter pooling.
DB Adapter starts polling Staging table(EMP) in parallel with the interval. Both the servers in the Cluster are starts initiating DB Adapter instances in parallel and if we increase the servers form 2 to 3. The same way three instances of pooling components started.
For resolving this issue we need to set the singleton property in composite.
We have to set the Singleton Property in composite.xml