fenzo-core/src/main/java/com/netflix/fenzo/TaskScheduler.java
public void shutdown() {
        if (isShutdown.compareAndSet(false, true)) {
            executorService.shutdown();
            if (autoScaler != null) {
                autoScaler.shutdown();
            }
        }
    }
public void shutdown() {
        if (isShutdown.compareAndSet(false, true)) {
            executorService.shutdown();
            if (autoScaler != null) {
                autoScaler.shutdown();
            }
        }
    }
Mark task scheduler as shutdown and shutdown any thread pool executors created.