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https://issues.apache.org/jira/browse/HDFS-12147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16091335#comment-16091335
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Weiwei Yang commented on HDFS-12147:
------------------------------------

Hi [~nandakumar131]

Thank you. But even we want to expose them to clients, the API arguments still 
look odd to me. How would a client to compose an OzoneAcl in the request when 
it wants to check a certain access? Semantically we often check against an 
{{User Identity}} and an {{operation}} (e.g read/write/delete). Use this patch, 
does it work like following?

Suppose a bucket has following ACL

{noformat}
user:bilbo:rw
user:john:r
user:mike:w
{noformat}

and a client pass an OzoneAcl like following

{{user:mike:w}}

this means I want to check if user mike has the write permission to the bucket? 
And this case it has the access.

What if the bucket ACL is like following

{noformat}
user:bilbo:rw
user:john:r
group:hadoop:w
{noformat}

and mike belongs to hadoop group, when I verify {{user:mike:w}}, will it give 
me an access control exception?

> Ozone: KSM: Add checkBucketAccess
> ---------------------------------
>
>                 Key: HDFS-12147
>                 URL: https://issues.apache.org/jira/browse/HDFS-12147
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>            Reporter: Nandakumar
>            Assignee: Nandakumar
>         Attachments: HDFS-12147-HDFS-7240.000.patch, 
> HDFS-12147-HDFS-7240.001.patch
>
>
> Checks if the caller has access to a given bucket.



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