[HUDI-2677] Add DFS based message queue for flink writer (#3915)

hudi-flink/src/test/java/org/apache/hudi/sink/message/TestMessageBus.java

@@ -0,0 +1,137 @@
+/*
+ * 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.sink.message;
+
+import org.apache.hudi.common.fs.FSUtils;
+import org.apache.hudi.common.util.Option;
+import org.apache.hudi.util.StreamerUtil;
+import org.apache.hudi.utils.TestConfigurations;
+
+import org.apache.flink.configuration.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.IntStream;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * Test cases for {@link MessageBus}.
+ */
+public class TestMessageBus {
+
+  private String basePath;
+  private FileSystem fs;
+
+  private MessageDriver driver;
+
+  @TempDir
+  File tempFile;
+
+  @BeforeEach
+  public void beforeEach() throws Exception {
+    basePath = tempFile.getAbsolutePath();
+    this.fs = FSUtils.getFs(tempFile.getAbsolutePath(), StreamerUtil.getHadoopConf());
+
+    Configuration conf = TestConfigurations.getDefaultConf(basePath);
+    StreamerUtil.initTableIfNotExists(conf);
+
+    this.driver = MessageDriver.getInstance(fs, basePath);
+  }
+
+  @Test
+  void testWriteAndReadMessage() {
+    MessageClient client = MessageClient.getSingleton(fs, basePath);
+
+    // write and read 5 committed checkpoints
+    IntStream.range(0, 5).forEach(i -> driver.commitCkp(i, i + "", i + 1 + ""));
+
+    IntStream.range(0, 5).forEach(i -> {
+      Option<MessageBus.CkpMessage> messageOpt = client.getCkpMessage(i);
+      assertTrue(messageOpt.isPresent());
+
+      MessageBus.CkpMessage ckpMessage = messageOpt.get();
+      assertTrue(ckpMessage.committed);
+      assertThat(ckpMessage.commitInstant, is(i + ""));
+      assertThat(ckpMessage.inflightInstant, is(i + 1 + ""));
+    });
+
+    // write and read 5 aborted checkpoints
+    IntStream.range(5, 10).forEach(i -> driver.abortCkp(i));
+
+    IntStream.range(5, 10).forEach(i -> {
+      Option<MessageBus.CkpMessage> messageOpt = client.getCkpMessage(i);
+      assertTrue(messageOpt.isPresent());
+
+      MessageBus.CkpMessage ckpMessage = messageOpt.get();
+      assertFalse(ckpMessage.committed);
+      assertThat(ckpMessage.commitInstant, is(MessageBus.ABORTED_CKP_INSTANT));
+      assertThat(ckpMessage.inflightInstant, is(MessageBus.ABORTED_CKP_INSTANT));
+    });
+  }
+
+  @Test
+  void testWriteCleaning() {
+    // write and read 20 committed checkpoints
+    IntStream.range(0, 20).forEach(i -> driver.commitCkp(i, i + "", i + 1 + ""));
+    assertThat("The id cache should not be cleaned", driver.getCkpIdCache().size(), is(20));
+
+    // write and read 10 aborted checkpoints
+    IntStream.range(20, 29).forEach(i -> driver.abortCkp(i));
+    assertThat("The id cache should not be cleaned", driver.getCkpIdCache().size(), is(29));
+
+    driver.commitCkp(29, "29", "30");
+    assertThat("The cache should be cleaned", driver.getCkpIdCache().size(), is(20));
+    assertThat(longSet2String(driver.getCkpIdCache().keySet()),
+        is("10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29"));
+  }
+
+  @Test
+  void testReadCleaning() {
+    MessageClient client = MessageClient.getSingleton(fs, basePath);
+
+    // write and read 20 committed checkpoints
+    IntStream.range(0, 20).forEach(i -> driver.commitCkp(i, i + "", i + 1 + ""));
+
+    IntStream.range(0, 10).forEach(client::getCkpMessage);
+    assertThat("The checkpoint cache should not be cleaned", client.getCkpCache().size(), is(10));
+
+    client.getCkpMessage(10);
+    assertThat("The checkpoint cache should be cleaned", client.getCkpCache().size(), is(10));
+
+    IntStream.range(11, 15).forEach(client::getCkpMessage);
+    assertThat("The checkpoint cache should be cleaned", client.getCkpCache().size(), is(10));
+    assertThat(longSet2String(client.getCkpCache().keySet()), is("5,6,7,8,9,10,11,12,13,14"));
+  }
+
+  private static String longSet2String(Set<Long> longSet) {
+    List<String> elements = new ArrayList<>();
+    longSet.stream().mapToInt(Long::intValue).forEach(i -> elements.add(i + ""));
+    return String.join(",", elements);
+  }
+}

hudi-flink/src/test/java/org/apache/hudi/sink/utils/StreamWriteFunctionWrapper.java

@@ -248,6 +248,7 @@ public class StreamWriteFunctionWrapper<I> implements TestFunctionWrapper<I> {
   public void close() throws Exception {
     coordinator.close();
     ioManager.close();
+    writeFunction.close();
   }
 
   public StreamWriteOperatorCoordinator getCoordinator() {