HBASE-23681 Add UT for procedure store region flusher (#1024)

Signed-off-by: stack <stack@apache.org>

hbase-server/src/test/java/org/apache/hadoop/hbase/procedure2/store/region/TestRegionProcedureStoreFlush.java

@@ -0,0 +1,150 @@
+/**
+ * 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.hadoop.hbase.procedure2.store.region;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.ArgumentMatchers.anyBoolean;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.Abortable;
+import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.Waiter;
+import org.apache.hadoop.hbase.regionserver.HRegion;
+import org.apache.hadoop.hbase.regionserver.HStore;
+import org.apache.hadoop.hbase.testclassification.MasterTests;
+import org.apache.hadoop.hbase.testclassification.MediumTests;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+@Category({ MasterTests.class, MediumTests.class })
+public class TestRegionProcedureStoreFlush {
+
+  @ClassRule
+  public static final HBaseClassTestRule CLASS_RULE =
+    HBaseClassTestRule.forClass(TestRegionProcedureStoreFlush.class);
+
+  private Configuration conf;
+
+  private HRegion region;
+
+  private RegionFlusherAndCompactor flusher;
+
+  private AtomicInteger flushCalled;
+
+  private AtomicLong memstoreHeapSize;
+
+  private AtomicLong memstoreOffHeapSize;
+
+  @Before
+  public void setUp() throws IOException {
+    conf = HBaseConfiguration.create();
+    region = mock(HRegion.class);
+    HStore store = mock(HStore.class);
+    when(store.getStorefilesCount()).thenReturn(1);
+    when(region.getStores()).thenReturn(Collections.singletonList(store));
+    flushCalled = new AtomicInteger(0);
+    memstoreHeapSize = new AtomicLong(0);
+    memstoreOffHeapSize = new AtomicLong(0);
+    when(region.getMemStoreHeapSize()).thenAnswer(invocation -> memstoreHeapSize.get());
+    when(region.getMemStoreOffHeapSize()).thenAnswer(invocation -> memstoreOffHeapSize.get());
+    when(region.flush(anyBoolean())).thenAnswer(invocation -> {
+      assertTrue(invocation.getArgument(0));
+      memstoreHeapSize.set(0);
+      memstoreOffHeapSize.set(0);
+      flushCalled.incrementAndGet();
+      return null;
+    });
+  }
+
+  @After
+  public void tearDown() {
+    if (flusher != null) {
+      flusher.close();
+      flusher = null;
+    }
+  }
+
+  private void initFlusher() {
+    flusher = new RegionFlusherAndCompactor(conf, new Abortable() {
+
+      @Override
+      public boolean isAborted() {
+        return false;
+      }
+
+      @Override
+      public void abort(String why, Throwable e) {
+      }
+    }, region);
+  }
+
+  @Test
+  public void testTriggerFlushBySize() throws IOException, InterruptedException {
+    conf.setLong(RegionFlusherAndCompactor.FLUSH_SIZE_KEY, 1024 * 1024);
+    initFlusher();
+    memstoreHeapSize.set(1000 * 1024);
+    flusher.onUpdate();
+    Thread.sleep(1000);
+    assertEquals(0, flushCalled.get());
+    memstoreOffHeapSize.set(1000 * 1024);
+    flusher.onUpdate();
+    Waiter.waitFor(conf, 2000, () -> flushCalled.get() == 1);
+  }
+
+  private void assertTriggerFlushByChanges(int changes) throws InterruptedException {
+    int currentFlushCalled = flushCalled.get();
+    for (int i = 0; i < changes; i++) {
+      flusher.onUpdate();
+    }
+    Thread.sleep(1000);
+    assertEquals(currentFlushCalled, flushCalled.get());
+    flusher.onUpdate();
+    Waiter.waitFor(conf, 5000, () -> flushCalled.get() == currentFlushCalled + 1);
+  }
+
+  @Test
+  public void testTriggerFlushByChanges() throws InterruptedException {
+    conf.setLong(RegionFlusherAndCompactor.FLUSH_PER_CHANGES_KEY, 10);
+    initFlusher();
+    assertTriggerFlushByChanges(10);
+    assertTriggerFlushByChanges(10);
+  }
+
+  @Test
+  public void testPeriodicalFlush() throws InterruptedException {
+    conf.setLong(RegionFlusherAndCompactor.FLUSH_INTERVAL_MS_KEY, 1000);
+    initFlusher();
+    assertEquals(0, flushCalled.get());
+    Thread.sleep(1500);
+    assertEquals(1, flushCalled.get());
+    Thread.sleep(1000);
+    assertEquals(2, flushCalled.get());
+
+  }
+}