HDFS-13950. ACL documentation update to indicate that ACL entries are capped by 
32. Contributed by Adam Antal.

Signed-off-by: Wei-Chiu Chuang <weic...@apache.org>


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/cc2babc1
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/cc2babc1
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/cc2babc1

Branch: refs/heads/HEAD
Commit: cc2babc1f75c93bf89a8f10da525f944c15d02ea
Parents: 396ce0d
Author: Adam Antal <adam.an...@cloudera.com>
Authored: Thu Oct 4 15:20:41 2018 -0700
Committer: Wei-Chiu Chuang <weic...@apache.org>
Committed: Thu Oct 4 15:22:44 2018 -0700

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 .../hadoop-hdfs/src/site/markdown/HdfsPermissionsGuide.md          | 2 ++
 1 file changed, 2 insertions(+)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/cc2babc1/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsPermissionsGuide.md
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diff --git 
a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsPermissionsGuide.md 
b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsPermissionsGuide.md
index 82b5cec..a4a3b7d 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsPermissionsGuide.md
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsPermissionsGuide.md
@@ -221,6 +221,8 @@ Note that the copy occurs at time of creation of the new 
file or sub-directory.
 
 The default ACL must have all minimum required ACL entries, including the 
unnamed user (file owner), unnamed group (file group) and other entries. If the 
user doesn't supply one of these entries while setting a default ACL, then the 
entries are inserted automatically by copying the corresponding permissions 
from the access ACL, or permission bits if there is no access ACL. The default 
ACL also must have mask. As described above, if the mask is unspecified, then a 
mask is inserted automatically by calculating the union of permissions on all 
entries that would be filtered by the mask.
 
+Note that you can not have unlimited amount of ACL entries for a given file or 
directory. The maximum number is 32 for access and 32 for default entries which 
is 64 in total.
+
 When considering a file that has an ACL, the algorithm for permission checks 
changes to:
 
 * If the user name matches the owner of file, then the owner


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