Cb-computations and RxComputationScheduler threads does not ending

I am using java-client-2.5.0.jar, rxjava-1.3.0.jar and core-io-1.5.0.jar in our application. And our application uses Couchbase server 5.1. We deployed our application in Tibco server. Two services are utilising this application for CRUD operation on Couchbase. I am maintaining single connection and reusing it again and again for all CRUD activities. Now the problem is, cb-computations thread and RxComputationScheduler threads are not ending. Please help me why these threads are not ending. Thanks