kafka consumer connector引入事务隔离级别 fix #1512

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

@@ -56,6 +56,7 @@ public class KafkaCanalConnector implements CanalMQConnector {
         properties.put("auto.offset.reset", "latest"); // 如果没有offset则从最后的offset开始读
         properties.put("request.timeout.ms", "40000"); // 必须大于session.timeout.ms的设置
         properties.put("session.timeout.ms", "30000"); // 默认为30秒
+        properties.put("isolation.level", "read_committed");
         if (batchSize == null) {
             batchSize = 100;
         }