1 files changed, 12 insertions, 0 deletions
diff --git a/src/main/java/com/amazon/carbonado/repo/map/MapTransaction.java b/src/main/java/com/amazon/carbonado/repo/map/MapTransaction.java
index d2cfe87..93bcbdc 100644
--- a/src/main/java/com/amazon/carbonado/repo/map/MapTransaction.java
+++ b/src/main/java/com/amazon/carbonado/repo/map/MapTransaction.java
@@ -126,6 +126,10 @@ class MapTransaction {
             public void undo() {
                 storage.mapRemove(key);
             }
+
+            public String toString() {
+                return "undo insert by remove: " + key;
+            }
         });
     }
 
@@ -137,6 +141,10 @@ class MapTransaction {
             public void undo() {
                 storage.mapPut(old);
             }
+
+            public String toString() {
+                return "undo update by put: " + old;
+            }
         });
     }
 
@@ -148,6 +156,10 @@ class MapTransaction {
             public void undo() {
                 storage.mapPut(old);
             }
+
+            public String toString() {
+                return "undo delete by put: " + old;
+            }
         });
     }