Merge pull request #47 from ruanwenjun/dev_wenjun_fixAsyncDelay

Set async check miniest interval to 1s

dolphinscheduler-task-plugin/dolphinscheduler-task-api/src/main/java/org/apache/dolphinscheduler/plugin/task/api/async/AsyncTaskExecutionContext.java

@@ -42,7 +42,8 @@ public class AsyncTaskExecutionContext implements Delayed {
 
     @Override
     public long getDelay(TimeUnit unit) {
-        return unit.toSeconds(asyncTaskExecuteFunction.getTaskExecuteInterval().toMillis());
+        long intervalSeconds = Math.max(asyncTaskExecuteFunction.getTaskExecuteInterval().getSeconds(), 1);
+        return unit.convert(intervalSeconds, TimeUnit.SECONDS);
     }
 
     @Override