解决分布式同步开关关闭同步状态下,

重启 kafka canal-adapter后在开启同步,丢失数据的bug

client/src/main/java/com/alibaba/otter/canal/client/kafka/KafkaCanalConnector.java

@@ -87,9 +87,11 @@ public class KafkaCanalConnector implements CanalMQConnector {
     public void disconnect() {
         if (kafkaConsumer != null) {
             kafkaConsumer.close();
+            kafkaConsumer = null;
         }
         if (kafkaConsumer2 != null) {
             kafkaConsumer2.close();
+            kafkaConsumer2 = null;
         }
 
         connected = false;