Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/17495#discussion_r112010088
--- Diff:
core/src/test/scala/org/apache/spark/deploy/SparkHadoopUtilSuite.scala ---
@@ -0,0 +1,83 @@
+/*
+ * 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.deploy
+
+import org.apache.hadoop.fs.FileStatus
+import org.apache.hadoop.fs.permission.{FsAction, FsPermission}
+import org.apache.hadoop.security.UserGroupInformation
+import org.scalatest.Matchers
+
+import org.apache.spark.SparkFunSuite
+
+class SparkHadoopUtilSuite extends SparkFunSuite with Matchers {
+ test("check file permission") {
+ import FsAction._
+ val user = UserGroupInformation.getCurrentUser.getShortUserName
--- End diff --
Instead of using `getCurrentUser`, I think it would be safer to use
`createUserForTesting` + `ugi.doAs`. That lets you define the user name and the
groups and thus avoids possible clashes with the OS configuration.
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