Improve log compaction efficiency in AtomixConsistentSetMultimap.

Change-Id: Ideb89cac72567726eb9bf67cf3ef19e7e00a9c83
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentMultimapCommands.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentMultimapCommands.java
index 8f00f8d..d765466 100644
--- a/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentMultimapCommands.java
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/resources/impl/AtomixConsistentMultimapCommands.java
@@ -291,7 +291,7 @@
 
         @Override
         public CompactionMode compaction() {
-            return CompactionMode.FULL;
+            return CompactionMode.TOMBSTONE;
         }
 
         @Override
@@ -352,7 +352,7 @@
 
         @Override
         public CompactionMode compaction() {
-            return CompactionMode.FULL;
+            return CompactionMode.TOMBSTONE;
         }
 
         @Override
@@ -479,7 +479,7 @@
 
         @Override
         public CompactionMode compaction() {
-            return CompactionMode.FULL;
+            return CompactionMode.QUORUM;
         }
 
         @Override
@@ -514,6 +514,10 @@
      */
     @SuppressWarnings("serial")
     public static class Clear extends MultimapCommand<Void> {
+        @Override
+        public CompactionMode compaction() {
+            return CompactionMode.TOMBSTONE;
+        }
     }
 
     /**