在使用zipkin的過程，引用hystrix導致呼叫鏈條break,原來hystrix預設容錯方法是執行緒隔離，而在這個過程中使用了執行緒池，而執行緒池中的traceId無法重新生成，導致呼叫鏈斷掉，因此重寫HystrixConcurrencyStrategy 類的wrapCallable即可達到修復效果，程式碼如下：

@Component
public class TracingHystrixConcurrencyStrategy extends HystrixConcurrencyStrategy {
    @Autowired
    private Tracing tracing;

    public TracingHystrixConcurrencyStrategy(){
        HystrixPlugins.reset();
        HystrixPlugins.getInstance().registerConcurrencyStrategy(this);
    }

    @Override
    public <T> Callable<T> wrapCallable(Callable<T> callable) {
        CurrentTraceContext context = tracing.currentTraceContext();
        if(context!=null)
            return context.wrap(callable);
        else
            return super.wrapCallable(callable);
    }

    public void setTracing(Tracing tracing) {
        this.tracing = tracing;
    }
}