HADOOP-13698. Document caveat for KeyShell when underlying KeyProvider does not 
delete a key.


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/b84c4891
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/b84c4891
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/b84c4891

Branch: refs/heads/HDFS-10285
Commit: b84c4891f9eca8d56593e48e9df88be42e24220d
Parents: 3c9a010
Author: Xiao Chen <x...@apache.org>
Authored: Tue Oct 11 17:05:00 2016 -0700
Committer: Xiao Chen <x...@apache.org>
Committed: Tue Oct 11 17:05:00 2016 -0700

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 .../hadoop-common/src/site/markdown/CommandsManual.md            | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/b84c4891/hadoop-common-project/hadoop-common/src/site/markdown/CommandsManual.md
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diff --git 
a/hadoop-common-project/hadoop-common/src/site/markdown/CommandsManual.md 
b/hadoop-common-project/hadoop-common/src/site/markdown/CommandsManual.md
index 4d7d504..2ece71a 100644
--- a/hadoop-common-project/hadoop-common/src/site/markdown/CommandsManual.md
+++ b/hadoop-common-project/hadoop-common/src/site/markdown/CommandsManual.md
@@ -202,7 +202,9 @@ Manage keys via the KeyProvider. For details on 
KeyProviders, see the [Transpare
 
 Providers frequently require that a password or other secret is supplied. If 
the provider requires a password and is unable to find one, it will use a 
default password and emit a warning message that the default password is being 
used. If the `-strict` flag is supplied, the warning message becomes an error 
message and the command returns immediately with an error status.
 
-NOTE: Some KeyProviders (e.g. 
org.apache.hadoop.crypto.key.JavaKeyStoreProvider) does not support uppercase 
key names.
+NOTE: Some KeyProviders (e.g. 
org.apache.hadoop.crypto.key.JavaKeyStoreProvider) do not support uppercase key 
names.
+
+NOTE: Some KeyProviders do not directly execute a key deletion (e.g. performs 
a soft-delete instead, or delay the actual deletion, to prevent mistake). In 
these cases, one may encounter errors when creating/deleting a key with the 
same name after deleting it. Please check the underlying KeyProvider for 
details.
 
 ### `trace`
 


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