Add unit tests for creating lots of tables

Author: zhangrenhua

hudi-utilities/src/test/java/org/apache/hudi/utilities/functional/TestCreateLargeTableProvider.java

@@ -0,0 +1,54 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.apache.hudi.utilities.functional;
+
+import org.apache.hudi.utilities.testutils.SparkClientFunctionalTestHarnessWithHiveSupport;
+import org.apache.spark.sql.SparkSession;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Test if creating a large number of hive tables will cause memory overflow {@link TestCreateLargeTableProvider}.
+ */
+@Tag("functional")
+public class TestCreateLargeTableProvider extends SparkClientFunctionalTestHarnessWithHiveSupport {
+
+  //  /**
+  //   * Running this method locally can reproduce the memory overflow caused by the HiveClient object not being released.
+  //   */
+  //  @Disabled
+  //  @Test
+  //  public void testHiveClientOOM() {
+  //    SparkSession spark = spark();
+  //    for (int i = 0; i < 10000; i++) {
+  //      HiveClientUtils.newClientForMetadata(spark.sparkContext().getConf(), spark.sessionState().newHadoopConf());
+  //    }
+  //  }
+
+  @Disabled
+  @Test
+  public void createLargeHiveTable() {
+    SparkSession spark = spark();
+    for (int i = 0; i < 10000; i++) {
+      spark.sql("drop table if exists test_" + i);
+      spark.sql(String.format("CREATE TABLE test_%s(wid string,csny string) using hudi tblproperties (type = 'mor',primaryKey = 'wid')", i));
+    }
+  }
+}