smallzhongfeng commented on code in PR #39448:
URL: https://github.com/apache/spark/pull/39448#discussion_r1064268534
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core/src/main/scala/org/apache/spark/storage/DiskBlockManager.scala:
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@@ -301,9 +301,6 @@ private[spark] class DiskBlockManager(
* Create a directory that is writable by the group.
* Grant the permission 770 "rwxrwx---" to the directory so the shuffle
server can
* create subdirs/files within the merge folder.
- * TODO: Find out why can't we create a dir using java api with permission
770
Review Comment:
In unix like systems every process has a property called umask which is
masked onto the permissions of any file created and inherited by child
processes. the default is 0002 or "turn off write for others". So it's most
likely that Java is setting the permission you seek and then it's being masked
out. At present, this issue has not been resolved, so my current approach is to
create a directory first, and then explicitly grant permissions.
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