diff --git a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DefaultTransactionalSet.java b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DefaultTransactionalSet.java
new file mode 100644
index 0000000..11fcb80
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DefaultTransactionalSet.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.store.consistent.impl;
+
+
+import org.onosproject.store.service.Serializer;
+import org.onosproject.store.service.TransactionContext;
+import org.onosproject.store.service.TransactionalMap;
+import org.onosproject.store.service.TransactionalSet;
+
+/**
+ * Default TransactionalSet implementation that provides a repeatable reads
+ * transaction isolation level.
+ *
+ * @param <E> element type.
+ */
+public class DefaultTransactionalSet<E> implements TransactionalSet<E> {
+
+    private TransactionalMap<E, Boolean> map;
+
+    // dummy value to associate with an Object in the backing map
+    private static final Boolean PRESENT = new Boolean(true);
+
+    public DefaultTransactionalSet(
+            String name,
+            TransactionContext txContext,
+            Serializer serializer) {
+        map = txContext.getTransactionalMap(name, serializer);
+    }
+
+    @Override
+    public boolean add(E e) {
+        return map.put(e, PRESENT) == null;
+    }
+
+    @Override
+    public boolean remove(E e) {
+        return map.remove(e) != null;
+    }
+
+    @Override
+    public boolean contains(E e) {
+        return map.get(e) != null;
+    }
+}