kafka 客户端 example 完善

kafka-client/src/test/java/com/alibaba/otter/canal/kafka/client/running/KafkaCanalClientExample.java

@@ -86,7 +86,6 @@ public class KafkaCanalClientExample {
     }
 
     private void process() {
-        while (running) {
         try {
             connector.subscribe();
             while (running) {
@@ -110,7 +109,11 @@ public class KafkaCanalClientExample {
 
                     connector.ack(); // 提交确认
                 } catch (WakeupException e) {
+                    try {
+                        Thread.sleep(500); //延时确保running状态的改变
+                    } catch (InterruptedException ie) {
                         //ignore
+                    }
                 } catch (Exception e) {
                     logger.error(e.getMessage(), e);
                 }
@@ -122,4 +125,3 @@ public class KafkaCanalClientExample {
         }
     }
 }
-}