YARN-10901. Permission checking error on an existing directory in LogAggregationFileController#verifyAndCreateRemoteLogDir

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/logaggregation/filecontroller/LogAggregationFileController.java

@@ -19,6 +19,7 @@
 package org.apache.hadoop.yarn.logaggregation.filecontroller;
 
 import com.google.common.annotations.VisibleForTesting;
+import org.apache.commons.lang3.RandomStringUtils;
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
@@ -368,17 +369,25 @@ public void verifyAndCreateRemoteLogDir() {
         throw new YarnRuntimeException("Failed to create remoteLogDir ["
             + remoteRootLogDir + "]", e);
       }
-    } else{
+    } else {
       //Check if FS has capability to set/modify permissions
+      Path permissionCheckFile = new Path(qualified, String.format("%s.permission_check",
+          RandomStringUtils.randomAlphanumeric(8)));
       try {
-        remoteFS.setPermission(qualified, new FsPermission(TLDIR_PERMISSIONS));
+        remoteFS.createNewFile(permissionCheckFile);
+        remoteFS.setPermission(permissionCheckFile, new FsPermission(TLDIR_PERMISSIONS));
       } catch (UnsupportedOperationException use) {
         LOG.info("Unable to set permissions for configured filesystem since"
             + " it does not support this", remoteFS.getScheme());
         fsSupportsChmod = false;
       } catch (IOException e) {
         LOG.warn("Failed to check if FileSystem suppports permissions on "
             + "remoteLogDir [" + remoteRootLogDir + "]", e);
+      } finally {
+        try {
+          remoteFS.delete(permissionCheckFile, false);
+        } catch (IOException ignored) {
+        }
       }
     }
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/logaggregation/filecontroller/TestLogAggregationFileController.java

@@ -0,0 +1,75 @@
+/**
+ * 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.yarn.logaggregation.filecontroller;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.junit.Assert;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import java.net.URI;
+
+import static org.apache.hadoop.yarn.logaggregation.filecontroller.LogAggregationFileController.TLDIR_PERMISSIONS;
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.any;
+import static org.mockito.Mockito.eq;
+
+/**
+ * Test for the abstract {@link LogAggregationFileController} class,
+ * checking its core functionality.
+ */
+public class TestLogAggregationFileController {
+
+  @Test
+  public void testRemoteDirCreationWithCustomUser() throws Exception {
+    FileSystem fs = mock(FileSystem.class);
+    doReturn(new URI("")).when(fs).getUri();
+    doReturn(new FileStatus(128, false, 0, 64, System.currentTimeMillis(),
+        System.currentTimeMillis(), new FsPermission(TLDIR_PERMISSIONS),
+        "not_yarn_user", "yarn_group", new Path("/tmp/logs"))).when(fs)
+        .getFileStatus(any(Path.class));
+
+    Configuration conf = new Configuration();
+    LogAggregationFileController controller = mock(
+        LogAggregationFileController.class, Mockito.CALLS_REAL_METHODS);
+    controller.fsSupportsChmod = true;
+    doReturn(fs).when(controller).getFileSystem(any(Configuration.class));
+
+    UserGroupInformation ugi = UserGroupInformation.createUserForTesting(
+        "yarn_user", new String[]{"yarn_group", "other_group"});
+    UserGroupInformation.setLoginUser(ugi);
+
+    doNothing().when(controller).initInternal(any(Configuration.class));
+    controller.initialize(conf, "TFile");
+    controller.verifyAndCreateRemoteLogDir();
+
+    verify(fs).createNewFile(any());
+    verify(fs).setPermission(any(), eq(new FsPermission(TLDIR_PERMISSIONS)));
+    verify(fs).delete(any(), eq(false));
+    Assert.assertTrue(controller.fsSupportsChmod);
+  }
+}