diff --git a/parse/src/main/java/com/alibaba/otter/canal/parse/inbound/AbstractEventParser.java b/parse/src/main/java/com/alibaba/otter/canal/parse/inbound/AbstractEventParser.java
index 9e8c10ab..00f149be 100644
--- a/parse/src/main/java/com/alibaba/otter/canal/parse/inbound/AbstractEventParser.java
+++ b/parse/src/main/java/com/alibaba/otter/canal/parse/inbound/AbstractEventParser.java
@@ -388,7 +388,10 @@ public abstract class AbstractEventParser<EVENT> extends AbstractCanalLifeCycle
             String name = String.format("destination = %s , address = %s , HeartBeatTimeTask",
                 destination,
                 runningInfo == null ? null : runningInfo.getAddress().toString());
-            synchronized (MysqlEventParser.class) {
+//             synchronized(AbstractEventParser.class){
+//             synchronized (MysqlEventParser.class) {
+//             why use MysqlEventParser.class, u know, MysqlEventParser is the child class 4 AbstractEventParser,
+//             do this is ...
                 if (timer == null) {
                     timer = new Timer(name, true);
                 }