Error while stopping Tomcat, using astyanax cassandra driver

Question

I use astyanax cassandra driver on tomcat to access data from cassandra. while stopping tomcat server; it is hung on threads started from astyanax library. Has any one come across this issue?

Stacktrace

appears to have started a thread named [SMA_ScoreReset] but has failed to stop it. This is very likely to create a memory leak .

appears to have started a thread named [pool-7-thread-35] but has failed to stop it. This is very likely to create a memory leak

I do have code which is to supposed to bring down the connection on shutdown

AstyanaxContext context = (AstyanaxContext)this.contextMap.get(ksName);
            if(context != null) {
                logger.info("shutdown context for keyspace " + ksName);
                ExecutorService asyncExecutor = context.getAstyanaxConfiguration().getAsyncExecutor();
                asyncExecutor.shutdown();

                try {
                    asyncExecutor.awaitTermination(10000L, TIMEUNIT);
                } catch (InterruptedException var6) {
                    ;
                }

                context.shutdown();`