YARN-9227. DistributedShell RelativePath is not removed at end. Contributed by Prabhu Joseph.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/ApplicationMaster.java

@@ -389,8 +389,9 @@ public class ApplicationMaster {
    */
   public static void main(String[] args) {
     boolean result = false;
+    ApplicationMaster appMaster = null;
     try {
-      ApplicationMaster appMaster = new ApplicationMaster();
+      appMaster = new ApplicationMaster();
       LOG.info("Initializing ApplicationMaster");
       boolean doRun = appMaster.init(args);
       if (!doRun) {
@@ -402,6 +403,10 @@ public class ApplicationMaster {
       LOG.error("Error running ApplicationMaster", t);
       LogManager.shutdown();
       ExitUtil.terminate(1, t);
+    } finally {
+      if (appMaster != null) {
+        appMaster.cleanup();
+      }
     }
     if (result) {
       LOG.info("Application Master completed successfully. exiting");
@@ -768,6 +773,18 @@ public class ApplicationMaster {
     new HelpFormatter().printHelp("ApplicationMaster", opts);
   }
 
+  private void cleanup() {
+    Path dst = null;
+    try {
+      FileSystem fs = FileSystem.get(conf);
+      dst = new Path(fs.getHomeDirectory(), getRelativePath(appName,
+          appId.toString(), ""));
+      fs.delete(dst, true);
+    } catch(IOException e) {
+      LOG.warn("Failed to remove application staging directory {}", dst);
+    }
+  }
+
   /**
    * Main run function for the application master
    *

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/Client.java

@@ -96,6 +96,7 @@ import org.apache.hadoop.yarn.util.UnitsConversionUtil;
 import org.apache.hadoop.yarn.util.resource.ResourceUtils;
 import org.apache.hadoop.yarn.util.resource.Resources;
 import org.apache.hadoop.yarn.util.timeline.TimelineUtils;
+import com.google.common.annotations.VisibleForTesting;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -147,6 +148,7 @@ public class Client {
   private YarnClient yarnClient;
   // Application master specific info to register a new Application with RM/ASM
   private String appName = "";
+  private ApplicationId applicationId;
   // App master priority
   private int amPriority = 0;
   // Queue for App master
@@ -759,7 +761,7 @@ public class Client {
     
     // set the application name
     ApplicationSubmissionContext appContext = app.getApplicationSubmissionContext();
-    ApplicationId appId = appContext.getApplicationId();
+    applicationId = appContext.getApplicationId();
 
     // Set up resource type requirements
     // For now, both memory and vcores are supported, so we set memory and
@@ -800,13 +802,13 @@ public class Client {
     // Copy the application master jar to the filesystem 
     // Create a local resource to point to the destination jar path 
     FileSystem fs = FileSystem.get(conf);
-    addToLocalResources(fs, appMasterJar, appMasterJarPath, appId.toString(),
-        localResources, null);
+    addToLocalResources(fs, appMasterJar, appMasterJarPath,
+        applicationId.toString(), localResources, null);
 
     // Set the log4j properties if needed 
     if (!log4jPropFile.isEmpty()) {
-      addToLocalResources(fs, log4jPropFile, log4jPath, appId.toString(),
-          localResources, null);
+      addToLocalResources(fs, log4jPropFile, log4jPath,
+          applicationId.toString(), localResources, null);
     }
 
     // Process local files for localization
@@ -833,7 +835,7 @@ public class Client {
 
       try {
         String fileName = f.getName();
-        uploadFile(fs, path, fileName, appId.toString());
+        uploadFile(fs, path, fileName, applicationId.toString());
         if (localizableFiles.length() == 0) {
           localizableFiles.append(fileName);
         } else {
@@ -857,7 +859,7 @@ public class Client {
       Path shellSrc = new Path(shellScriptPath);
       String shellPathSuffix =
           ApplicationMaster.getRelativePath(appName,
-              appId.toString(),
+              applicationId.toString(),
               SCRIPT_PATH);
       Path shellDst =
           new Path(fs.getHomeDirectory(), shellPathSuffix);
@@ -869,12 +871,12 @@ public class Client {
     }
 
     if (!shellCommand.isEmpty()) {
-      addToLocalResources(fs, null, shellCommandPath, appId.toString(),
+      addToLocalResources(fs, null, shellCommandPath, applicationId.toString(),
           localResources, shellCommand);
     }
 
     if (shellArgs.length > 0) {
-      addToLocalResources(fs, null, shellArgsPath, appId.toString(),
+      addToLocalResources(fs, null, shellArgsPath, applicationId.toString(),
           localResources, StringUtils.join(shellArgs, " "));
     }
 
@@ -1033,7 +1035,7 @@ public class Client {
     if (dockerClientConfig != null) {
       dockerCredentials =
           DockerClientConfigHandler.readCredentialsFromConfigFile(
-              new Path(dockerClientConfig), conf, appId.toString());
+              new Path(dockerClientConfig), conf, applicationId.toString());
     }
 
     if (rmCredentials != null || dockerCredentials != null) {
@@ -1071,7 +1073,7 @@ public class Client {
     // app submission failure?
 
     // Monitor the application
-    return monitorApplication(appId);
+    return monitorApplication(applicationId);
 
   }
 
@@ -1200,6 +1202,11 @@ public class Client {
     fs.copyFromLocalFile(new Path(fileSrcPath), dst);
   }
 
+  @VisibleForTesting
+  ApplicationId getAppId() {
+    return applicationId;
+  }
+
   private void prepareTimelineDomain() {
     TimelineClient timelineClient = null;
     if (conf.getBoolean(YarnConfiguration.TIMELINE_SERVICE_ENABLED,

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/test/java/org/apache/hadoop/yarn/applications/distributedshell/TestDistributedShell.java

@@ -18,6 +18,7 @@
 
 package org.apache.hadoop.yarn.applications.distributedshell;
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertFalse;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.when;
@@ -1809,4 +1810,40 @@ public class TestDistributedShell {
     client.init(args);
     client.run();
   }
+
+
+  @Test
+  public void testDistributedShellCleanup()
+      throws Exception {
+    String appName = "DistributedShellCleanup";
+    String[] args = {
+        "--jar",
+        APPMASTER_JAR,
+        "--num_containers",
+        "1",
+        "--shell_command",
+        Shell.WINDOWS ? "dir" : "ls",
+        "--appname",
+        appName
+    };
+    Configuration config = new Configuration(yarnCluster.getConfig());
+    Client client = new Client(config);
+    client.init(args);
+    client.run();
+    ApplicationId appId = client.getAppId();
+    String relativePath =
+        ApplicationMaster.getRelativePath(appName, appId.toString(), "");
+    FileSystem fs1 = FileSystem.get(config);
+    Path path = new Path(fs1.getHomeDirectory(), relativePath);
+
+    GenericTestUtils.waitFor(() -> {
+      try {
+        return !fs1.exists(path);
+      } catch (IOException e) {
+        return false;
+      }
+    }, 10, 60000);
+
+    assertFalse("Distributed Shell Cleanup failed", fs1.exists(path));
+  }
 }