Merge pull request #293 from MarkLinHz/master

fix bug of repeat log manager

parse/src/main/java/com/alibaba/otter/canal/parse/index/FailbackLogPositionManager.java

@@ -42,7 +42,7 @@ public class FailbackLogPositionManager extends AbstractLogPositionManager {
         }
 
         if (!secondary.isStart()) {
-            primary.start();
+            secondary.start();
         }
     }
 

parse/src/main/java/com/alibaba/otter/canal/parse/index/MixedLogPositionManager.java

@@ -38,8 +38,13 @@ public class MixedLogPositionManager extends AbstractLogPositionManager {
     public void start() {
         super.start();
 
-        memoryLogPositionManager.start();
-        zooKeeperLogPositionManager.start();
+        if (!memoryLogPositionManager.isStart()) {
+            memoryLogPositionManager.start();
+        }
+
+        if (!zooKeeperLogPositionManager.isStart()) {
+            zooKeeperLogPositionManager.start();
+        }
     }
 
     @Override