diff --git a/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/provider/DatasourceFactoryProvider.java b/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/provider/DatasourceFactoryProvider.java
index b0aded6..f35dce4 100644
--- a/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/provider/DatasourceFactoryProvider.java
+++ b/asterixdb/asterix-external-data/src/main/java/org/apache/asterix/external/provider/DatasourceFactoryProvider.java
@@ -116,9 +116,7 @@
             throw new NotImplementedException();
         }
 
-        if (factories == null) {
-            initFactories();
-        }
+        initFactories();
 
         if (factories.containsKey(adaptorName)) {
             Map<String, Class<?>> formatClassMap = factories.get(adaptorName);
@@ -134,7 +132,10 @@
         }
     }
 
-    protected static void initFactories() throws AsterixException {
+    protected static synchronized void initFactories() throws AsterixException {
+        if (factories != null) {
+            return;
+        }
         factories = new HashMap<>();
         ClassLoader cl = ParserFactoryProvider.class.getClassLoader();
         final Charset encoding = StandardCharsets.UTF_8;