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https://issues.apache.org/jira/browse/HDFS-11291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15826013#comment-15826013
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Surendra Singh Lilhore commented on HDFS-11291:
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I think this change is not required in {{unprotectedSetStoragePolicy()}}. 
{{setStoragePolicy()}} will just return void.

> Avoid unnecessary edit log for setStoragePolicy() and setReplication()
> ----------------------------------------------------------------------
>
>                 Key: HDFS-11291
>                 URL: https://issues.apache.org/jira/browse/HDFS-11291
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Surendra Singh Lilhore
>            Assignee: Surendra Singh Lilhore
>         Attachments: HDFS-11291.001.patch, HDFS-11291.002.patch
>
>
> We are setting the storage policy for file without checking the current 
> policy of file for avoiding extra getStoragePolicy() rpc call. Currently 
> namenode is not checking the current storage policy before setting new one 
> and adding edit logs. I think if the old and new storage policy is same we 
> can avoid set operation.



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