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https://issues.apache.org/jira/browse/HDFS-12123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16087804#comment-16087804
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Anu Engineer commented on HDFS-12123:
-------------------------------------

*OzoneClientImpl.java*

*  Line: 100, Please add a Preconditions.checkNotNull(conf);
*  Line 229, Please add    Preconditions.checkState(quota >= 0); 
*  Line 273, 281.. , Compiler warns that null is Confusing, plese rw-write as 
(OzoneAcl) null.
*  Line 317, no change is needed, just a comment. We don't have a good user 
model yet, neither ACLs model. At some point you might want to define it in 
  detail. Let us get this code in for now.
*  Line 435, // TODO: the following createContainer and key writes may fail, in 
which
    // case we should revert the above allocateKey to KSM.
  I think this a JIRA that we should file against KSM. Clients might fail 
before they can do this. So it is really KSM which needs to keep track of this 
and 
  cleanup. I know I wrote this comment long time ago. So taking this 
opportunity to fix my mistake.
*  Line 442, Nit: That line can be in a single line.
* Line 445,  Nit: 81 chars ??


I don't like that fact that we cannot assert in *TestOzoneClientImpl*, but I 
understand why. I hope your next patch will enable full scale testing.

I am +1 with these minor nits addressed.


> Ozone: OzoneClient: Abstraction of OzoneClient and default implementation
> -------------------------------------------------------------------------
>
>                 Key: HDFS-12123
>                 URL: https://issues.apache.org/jira/browse/HDFS-12123
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>            Reporter: Nandakumar
>            Assignee: Nandakumar
>         Attachments: HDFS-12123-HDFS-7240.000.patch
>
>
> {{OzoneClient}} interface defines all the client operations supported by 
> Ozone. 
> {{OzoneClientImpl}} will have the default implementation, it should connects 
> to KSM, SCM and DataNode through RPC protocol to execute client calls.
> Similarly we should have a client implementation which implements 
> {{OzoneClient}} and uses REST protocol to execute client calls.
> This will provide lots of flexibility to Ozone applications, when 
> applications are running inside the cluster, they can use RPC protocol, but 
> when running from outside the cluster, the same applications can speak REST 
> protocol to communicate with Ozone.



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