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https://issues.apache.org/jira/browse/HADOOP-12796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15144936#comment-15144936
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Chris Nauroth commented on HADOOP-12796:
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Nice find!
I just reviewed the HDFS ACLs code to see if we've got the same bug there, but
it looks fine. ACLs do preserve the sticky bit as necessary. (Relevant code
is in {{org.apache.hadoop.hdfs.server.namenode.AclStorage}}.
> FsPermission#applyUMask drops the sticky bit
> --------------------------------------------
>
> Key: HADOOP-12796
> URL: https://issues.apache.org/jira/browse/HADOOP-12796
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Reporter: Kazuho Fujii
>
> The sticky bit has no effect specified at create and mkdirs.
> The sticky bit is dropped when umask is applied. {{applyUMask}} method does
> not take over the sticky bit from the original {{FsPermission}} class.
> In contrast, the sticky bit specified in POSIX' create or mkdir system call
> is always reflected.
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