Kimahriman commented on a change in pull request #35085:
URL: https://github.com/apache/spark/pull/35085#discussion_r828629332
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File path: core/src/main/scala/org/apache/spark/storage/DiskBlockManager.scala
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@@ -166,13 +173,41 @@ private[spark] class DiskBlockManager(
}
}
+ /**
+ * SPARK-37618: Makes sure that the file is created as world readable. This
is to get
+ * around the fact that making the block manager sub dirs group writable
removes
+ * the setgid bit in secure Yarn environments, which prevents the shuffle
service
+ * from being able ot read shuffle files. The outer directories will still
not be
+ * world executable, so this doesn't allow access to these files except for
the
+ * running user and shuffle service.
+ */
+ def createWorldReadableFile(file: File): Unit = {
+ val path = file.toPath
+ Files.createFile(path)
+ val currentPerms = Files.getPosixFilePermissions(path)
+ currentPerms.add(PosixFilePermission.OTHERS_READ)
Review comment:
Wrapped the permissions changes in checking if it's enabled
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