thingsboard-memoizeit

diff --git a/application/src/main/java/org/thingsboard/server/actors/plugin/PluginProcessingContext.java b/application/src/main/java/org/thingsboard/server/actors/plugin/PluginProcessingContext.java
index 701f585..bcef69b 100644
--- a/application/src/main/java/org/thingsboard/server/actors/plugin/PluginProcessingContext.java
+++ b/application/src/main/java/org/thingsboard/server/actors/plugin/PluginProcessingContext.java
@@ -93,8 +93,8 @@ public final class PluginProcessingContext implements PluginContext {
     @Override
     public void saveAttributes(final TenantId tenantId, final EntityId entityId, final String scope, final List<AttributeKvEntry> attributes, final PluginCallback<Void> callback) {
         validate(entityId, new ValidationCallback(callback, ctx -> {
-            ListenableFuture<List<Void>> attrKvListFuture = pluginCtx.attributesService.save(entityId, scope, attributes);
-            Futures.addCallback(attrKvListFuture, getListCallback(callback, v -> {
+            ListenableFuture<List<Void>> futures = pluginCtx.attributesService.save(entityId, scope, attributes);
+            Futures.addCallback(futures, getListCallback(callback, v -> {
                 if (entityId.getEntityType() == EntityType.DEVICE) {
                     onDeviceAttributesChanged(tenantId, new DeviceId(entityId.getId()), scope, attributes);
                 }
@@ -106,8 +106,8 @@ public final class PluginProcessingContext implements PluginContext {
     @Override
     public void removeAttributes(final TenantId tenantId, final EntityId entityId, final String scope, final List<String> keys, final PluginCallback<Void> callback) {
         validate(entityId, new ValidationCallback(callback, ctx -> {
-            ListenableFuture<List<Void>> future = pluginCtx.attributesService.removeAll(entityId, scope, keys);
-            Futures.addCallback(future, getCallback(callback, v -> null), executor);
+            ListenableFuture<List<Void>> futures = pluginCtx.attributesService.removeAll(entityId, scope, keys);
+            Futures.addCallback(futures, getCallback(callback, v -> null), executor);
             if (entityId.getEntityType() == EntityType.DEVICE) {
                 onDeviceAttributesDeleted(tenantId, new DeviceId(entityId.getId()), keys.stream().map(key -> new AttributeKey(scope, key)).collect(Collectors.toSet()));
             }

diff --git a/dao/src/main/java/org/thingsboard/server/dao/attributes/CassandraBaseAttributesDao.java b/dao/src/main/java/org/thingsboard/server/dao/attributes/CassandraBaseAttributesDao.java
index 95f9270..a98f054 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/attributes/CassandraBaseAttributesDao.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/attributes/CassandraBaseAttributesDao.java
@@ -125,11 +125,7 @@ public class CassandraBaseAttributesDao extends CassandraAbstractAsyncDao implem
             stmt.setToNull(8);
         }
         log.trace("Generated save stmt [{}] for entityId {} and attributeType {} and attribute", stmt, entityId, attributeType, attribute);
-        return getFuture(executeAsyncWrite(stmt), rs -> getAttributeKvEntryFromRs(rs));
-    }
-
-    private Void getAttributeKvEntryFromRs(ResultSet rs) {
-        return null;
+        return getFuture(executeAsyncWrite(stmt), rs -> null);
     }
 
     @Override
@@ -148,7 +144,7 @@ public class CassandraBaseAttributesDao extends CassandraAbstractAsyncDao implem
                 .and(eq(ATTRIBUTE_TYPE_COLUMN, attributeType))
                 .and(eq(ATTRIBUTE_KEY_COLUMN, key));
         log.debug("Remove request: {}", delete.toString());
-        return getFuture(getSession().executeAsync(delete), rs -> getAttributeKvEntryFromRs(rs));
+        return getFuture(getSession().executeAsync(delete), rs -> null);
     }
 
     private PreparedStatement getSaveStmt() {