confmaster/src/main/java/com/navercorp/nbasearc/confmaster/io/EventSelector.java
public void shutdown() throws IOException {
        try {
            selector.close();
        } catch (IOException e) {
            Logger.error("Close nio event selector fail.", e);
            throw e;
        }
    }
public void shutdown() throws IOException {
        try {
            selector.close();
        } catch (IOException e) {
            Logger.error("Close nio event selector fail.", e);
            throw e;
        }
    }
Shutdown a selector
@throws IOException