[HUDI-3123] consistent hashing index: basic write path (upsert/insert) (#4480)

1. basic write path(insert/upsert) implementation
 2. adapt simple bucket index

hudi-common/src/test/java/org/apache/hudi/common/model/TestHoodieConsistentHashingMetadata.java

@@ -0,0 +1,31 @@
+/*
+ * 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.common.model;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class TestHoodieConsistentHashingMetadata {
+
+  @Test
+  public void testGetTimestamp() {
+    Assertions.assertTrue(HoodieConsistentHashingMetadata.getTimestampFromFile("0000.hashing_metadata").equals("0000"));
+    Assertions.assertTrue(HoodieConsistentHashingMetadata.getTimestampFromFile("1234.hashing_metadata").equals("1234"));
+  }
+}

hudi-common/src/test/java/org/apache/hudi/common/testutils/HoodieCommonTestHarness.java

@@ -66,6 +66,10 @@ public class HoodieCommonTestHarness {
     dataGen = new HoodieTestDataGenerator();
   }
 
+  protected void initTestDataGenerator(String[] partitionPaths) {
+    dataGen = new HoodieTestDataGenerator(partitionPaths);
+  }
+
   /**
    * Cleanups test data generator.
    *