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

@@ -18,6 +18,7 @@
 
 package org.apache.hadoop.yarn.logaggregation.filecontroller;
 
+import org.apache.commons.lang3.RandomStringUtils;
 import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting;
 
 import java.io.FileNotFoundException;
@@ -427,17 +428,25 @@ 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

@@ -19,17 +19,23 @@
 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.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.junit.Assert;
 import org.junit.Test;
+import org.mockito.ArgumentMatcher;
 import org.mockito.Mockito;
 
 import java.io.FileNotFoundException;
 import java.net.URI;
 
+import static org.apache.hadoop.yarn.logaggregation.filecontroller.LogAggregationFileController.TLDIR_PERMISSIONS;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.argThat;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.doThrow;
@@ -88,4 +94,51 @@ public void testRemoteDirCreationWithCustomGroup() throws Exception {
 
     verify(fs).setOwner(any(), eq("yarn_user"), eq(testGroupName));
   }
+
+  private static class PathContainsString implements ArgumentMatcher<Path> {
+    private final String expected;
+
+    PathContainsString(String expected) {
+      this.expected = expected;
+    }
+
+    @Override
+    public boolean matches(Path path) {
+      return path.getName().contains(expected);
+    }
+
+    @Override
+    public String toString() {
+      return "Path with name=" + expected;
+    }
+  }
+
+  @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);
+
+    controller.initialize(conf, "TFile");
+    controller.verifyAndCreateRemoteLogDir();
+
+    verify(fs).createNewFile(argThat(new PathContainsString(".permission_check")));
+    verify(fs).setPermission(argThat(new PathContainsString(".permission_check")),
+        eq(new FsPermission(TLDIR_PERMISSIONS)));
+    verify(fs).delete(argThat(new PathContainsString(".permission_check")), eq(false));
+    Assert.assertTrue(controller.fsSupportsChmod);
+  }
 }