fix non_heap mem leak while use jdbc catalog and metadata cache auto …

…refresh

fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/client/JdbcClient.java

@@ -49,6 +49,7 @@
 import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.function.Consumer;
 
 @Getter
@@ -57,6 +58,8 @@ public abstract class JdbcClient {
     private static final int HTTP_TIMEOUT_MS = 10000;
     protected static final int JDBC_DATETIME_SCALE = 6;
 
+    private static final Map<URL, ClassLoader> classLoaderMap = new ConcurrentHashMap<>();
+
     private String catalogName;
     protected String dbType;
     protected String jdbcUser;
@@ -154,11 +157,16 @@ private void initializeDataSource(JdbcClientConfig config) {
         }
     }
 
-    private void initializeClassLoader(JdbcClientConfig config) {
+    private synchronized void initializeClassLoader(JdbcClientConfig config) {
         try {
             URL[] urls = {new URL(JdbcResource.getFullDriverUrl(config.getDriverUrl()))};
-            ClassLoader parent = getClass().getClassLoader();
-            this.classLoader = URLClassLoader.newInstance(urls, parent);
+            if (classLoaderMap.containsKey(urls[0])) {
+                this.classLoader = classLoaderMap.get(urls[0]);
+            } else {
+                ClassLoader parent = getClass().getClassLoader();
+                this.classLoader = URLClassLoader.newInstance(urls, parent);
+                classLoaderMap.put(urls[0], this.classLoader);
+            }
         } catch (MalformedURLException e) {
             throw new RuntimeException("Error loading JDBC driver.", e);
         }