dongjoon-hyun commented on PR #36473:
URL: https://github.com/apache/spark/pull/36473#issuecomment-1120097496
That PR aims to minimize the diff for backporting.
```
test("SPARK-37618: Sub dirs are group writable when removing from shuffle
service enabled") {
val conf = testConf.clone
conf.set("spark.local.dir", rootDirs)
conf.set("spark.shuffle.service.enabled", "true")
conf.set("spark.shuffle.service.removeShuffle", "false")
+ val posix = POSIXFactory.getPOSIX
+ assume(posix.isNative, "Skipping test for SPARK-37618, native posix
support not found")
+
+ val oldUmask = getAndSetUmask(posix, "077")
val diskBlockManager = new DiskBlockManager(conf, deleteFilesOnStop =
true, isDriver = false)
val blockId = new TestBlockId("test")
val newFile = diskBlockManager.getFile(blockId)
@@ -163,6 +175,7 @@ class DiskBlockManagerSuite extends SparkFunSuite with
BeforeAndAfterEach with B
assert(parentDir2.exists && parentDir2.isDirectory)
val permission2 = Files.getPosixFilePermissions(parentDir2.toPath)
assert(permission2.contains(PosixFilePermission.GROUP_WRITE))
+ getAndSetUmask(posix, oldUmask)
}
```
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