Use RateLimiter instead of sleep. Repartition WriteStatus to optimize Hbase index writes (#1484)

hudi-common/src/test/java/org/apache/hudi/common/util/TestRatelimiter.java

@@ -0,0 +1,52 @@
+/*
+ * 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.util;
+
+import java.util.concurrent.TimeUnit;
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class TestRatelimiter {
+
+  @Test
+  public void testRateLimiterWithNoThrottling() throws InterruptedException {
+    RateLimiter limiter =  RateLimiter.create(1000, TimeUnit.SECONDS);
+    long start = System.currentTimeMillis();
+    assertEquals(true, limiter.tryAcquire(1000));
+    // Sleep to represent some operation
+    Thread.sleep(500);
+    long end = System.currentTimeMillis();
+    // With a large permit limit, there shouldn't be any throttling of operations
+    assertTrue((end - start) < TimeUnit.SECONDS.toMillis(2));
+  }
+
+  @Test
+  public void testRateLimiterWithThrottling() throws InterruptedException {
+    RateLimiter limiter =  RateLimiter.create(100, TimeUnit.SECONDS);
+    long start = System.currentTimeMillis();
+    assertEquals(true, limiter.tryAcquire(400));
+    // Sleep to represent some operation
+    Thread.sleep(500);
+    long end = System.currentTimeMillis();
+    // As size of operations is more than the maximum permits per second,
+    // whole execution should be greater than 1 second
+    assertTrue((end - start) >= TimeUnit.SECONDS.toMillis(2));
+  }
+}