vanzin commented on a change in pull request #24499: [SPARK-27677][Core] Serve 
local disk persisted blocks by the external service after releasing executor by 
dynamic allocation
URL: https://github.com/apache/spark/pull/24499#discussion_r285709291
 
 

 ##########
 File path: 
common/network-shuffle/src/test/java/org/apache/spark/network/shuffle/CleanupNonShuffleServiceServedFilesSuite.java
 ##########
 @@ -0,0 +1,256 @@
+/*
+ * 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.spark.network.shuffle;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.*;
+import java.util.concurrent.Executor;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.util.concurrent.MoreExecutors;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import org.apache.spark.network.util.MapConfigProvider;
+import org.apache.spark.network.util.TransportConf;
+
+public class CleanupNonShuffleServiceServedFilesSuite {
+
+  // Same-thread Executor used to ensure cleanup happens synchronously in test 
thread.
+  private Executor sameThreadExecutor = MoreExecutors.sameThreadExecutor();
+
+  private static final String SORT_MANAGER = 
"org.apache.spark.shuffle.sort.SortShuffleManager";
+
+  private static Set<String> expectedShuffleFilesToKeep =
+    ImmutableSet.of("shuffle_782_450_0.index", "shuffle_782_450_0.data");
+
+  private static Set<String> expectedShuffleAndRddFilesToKeep =
+    ImmutableSet.of("shuffle_782_450_0.index", "shuffle_782_450_0.data", 
"rdd_12_34");
+
+  private TransportConf getConf(boolean isFetchRddEnabled) {
+    return new TransportConf(
+      "shuffle",
+      new MapConfigProvider(ImmutableMap.of(
+        "spark.shuffle.service.fetch.rdd.enabled",
+        Boolean.toString(isFetchRddEnabled))));
+  }
+
+  @Test
+  public void cleanupOnRemovedExecutorWithFilesToKeepFetchRddEnabled() throws 
IOException {
+    cleanupOnRemovedExecutor(true, getConf(true), 
expectedShuffleAndRddFilesToKeep);
+  }
+
+  @Test
+  public void cleanupOnRemovedExecutorWithFilesToKeepFetchRddDisabled() throws 
IOException {
+    cleanupOnRemovedExecutor(true, getConf(false), expectedShuffleFilesToKeep);
+  }
+
+  @Test
+  public void cleanupOnRemovedExecutorWithoutFilesToKeep() throws IOException {
+    cleanupOnRemovedExecutor(false, getConf(true), Collections.emptySet());
+  }
+
+  private void cleanupOnRemovedExecutor(
+      boolean withFilesToKeep,
+      TransportConf conf,
+      Set<String> expectedFilesKept) throws IOException {
+    TestShuffleDataContext dataContext = initDataContext(withFilesToKeep);
+
+    ExternalShuffleBlockResolver resolver =
+      new ExternalShuffleBlockResolver(conf, null, sameThreadExecutor);
+    resolver.registerExecutor("app", "exec0", 
dataContext.createExecutorInfo(SORT_MANAGER));
+    resolver.executorRemoved("exec0", "app");
+
+    assertContainedFilenames(dataContext, expectedFilesKept);
+  }
+
+  @Test
+  public void cleanupUsesExecutorWithFilesToKeep() throws IOException {
+    cleanupUsesExecutor(true);
+  }
+
+  @Test
+  public void cleanupUsesExecutorWithoutFilesToKeep() throws IOException {
+    cleanupUsesExecutor(false);
+  }
+
+  private void cleanupUsesExecutor(boolean withFilesToKeep) throws IOException 
{
+    TestShuffleDataContext dataContext = initDataContext(withFilesToKeep);
+
+    AtomicBoolean cleanupCalled = new AtomicBoolean(false);
+
+    // Executor which does nothing to ensure we're actually using it.
 
 Review comment:
   Comment sounds weird.
   
   "Executor which only captures whether it's being used, without executing 
anything."

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