Hystrix命令在请求折叠器回退时

Question

我有一种情况，我想在hystrix请求折叠程序的批处理方法的后备上应用hystrix（并一一处理）。
后备方法（processEntryBatch_fallback）被调用。但是不会报告hystrix命令（processEntryBackup）的回退调用（甚至不会出现在仪表板上）。备用方法（finalFallback）也不会被调用。
我想知道我在这里想念什么吗？
我提到了javanica documentation

@Service
public class DummyService {

    private static final Logger log = LoggerFactory.getLogger(DummyService.class);

    //batch processing method
    public void processEntry(List<String> msg) {
        //batch processing
        throw new RuntimeException("Exception while batch processing");
    }

    //processing one-by-one
    @HystrixCommand(fallbackMethod="finalFallback")
    public void processEntryBackup(String msg) {
        throw new RuntimeException("Exception while single processing");
    }

    public void finalFallback(String msg) {
        log.info("logging..." + msg);
    }

    @HystrixCollapser(batchMethod = "processEntryBatch", collapserKey="ProcessEntryCollapser", scope=Scope.GLOBAL)
    public Future<Object> processEntryCollapser(String msg) {
        return null;
    }

    @HystrixCommand(fallbackMethod="processEntryBatch_fallback")
    public List<Object> processEntryBatch(List<String> msgList) {
        processEntry(msgList);
        return new ArrayList<>(msgList);
    }

    public List<Object> processEntryBatch_fallback(List<String> msgList) {
        for (String msg : msgList) {
            processEntryBackup(msg);                
        }
        return new ArrayList<>(msgList);
    }
}