failback容错模式下，设置重试次数为0，依旧会重试一次

[changfubai]

• I have searched the issues of this repository and believe that this is not a duplicate.
• I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

• Dubbo version: 2.7/3.0
• Operating System version: ==
• Java version: 1.8

Steps to reproduce this issue

review代码时发现failback模式下的retries判断有问题。

调用失败时，没有判断重试次数，就直接加到了timer中。

timer中执行时，如果抛出异常，才判断如果超过重试次数，不继续进行。

Pls. provide [GitHub address] to reproduce this issue.

Expected Result

加到timer中之前就需要判断一次retries

Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

Just put your stack trace here!

[changfubai]

I'll fix it later.

[283883031]

 public FailbackClusterInvoker(Directory<T> directory) {
        super(directory);

        int retriesConfig = getUrl().getParameter(RETRIES_KEY, DEFAULT_FAILBACK_TIMES);
        if (retriesConfig <= 0) {
            retriesConfig = DEFAULT_FAILBACK_TIMES;
        }
        int failbackTasksConfig = getUrl().getParameter(FAIL_BACK_TASKS_KEY, DEFAULT_FAILBACK_TASKS);
        if (failbackTasksConfig <= 0) {
            failbackTasksConfig = DEFAULT_FAILBACK_TASKS;
        }
        retries = retriesConfig;
        failbackTasks = failbackTasksConfig;
    }

set retries is zero ,finaly it's default? 改了，最后还是没改？

[changfubai]

 public FailbackClusterInvoker(Directory<T> directory) {
        super(directory);

        int retriesConfig = getUrl().getParameter(RETRIES_KEY, DEFAULT_FAILBACK_TIMES);
        if (retriesConfig <= 0) {
            retriesConfig = DEFAULT_FAILBACK_TIMES;
        }
        int failbackTasksConfig = getUrl().getParameter(FAIL_BACK_TASKS_KEY, DEFAULT_FAILBACK_TASKS);
        if (failbackTasksConfig <= 0) {
            failbackTasksConfig = DEFAULT_FAILBACK_TASKS;
        }
        retries = retriesConfig;
        failbackTasks = failbackTasksConfig;
    }

set retries is zero ,finaly it's default? 改了，最后还是没改？

这是构造方法的逻辑呀，我改的是run方法里的逻辑，显然不会又设置为DEFAULT_FAILBACK_TIMES呀

[juzi214032]

 public FailbackClusterInvoker(Directory<T> directory) {
        super(directory);

        int retriesConfig = getUrl().getParameter(RETRIES_KEY, DEFAULT_FAILBACK_TIMES);
        if (retriesConfig <= 0) {
            retriesConfig = DEFAULT_FAILBACK_TIMES;
        }
        int failbackTasksConfig = getUrl().getParameter(FAIL_BACK_TASKS_KEY, DEFAULT_FAILBACK_TASKS);
        if (failbackTasksConfig <= 0) {
            failbackTasksConfig = DEFAULT_FAILBACK_TASKS;
        }
        retries = retriesConfig;
        failbackTasks = failbackTasksConfig;
    }

set retries is zero ,finaly it's default? 改了，最后还是没改？

see #9526

[283883031]

ok