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https://issues.apache.org/jira/browse/HBASE-8372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13639035#comment-13639035
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Ted Yu commented on HBASE-8372:
-------------------------------

In my opinion, the places where UnsupportedOperationException is added should 
be good candidates for merging the ImmutableConfigMap's.
For patch v3, we would face scenario where dynamic config is no longer 
supported after one call to set() method. I don't think this is desirable.
                
> Provide mutability to CompoundConfiguration
> -------------------------------------------
>
>                 Key: HBASE-8372
>                 URL: https://issues.apache.org/jira/browse/HBASE-8372
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Ted Yu
>            Assignee: Jonathan Hsieh
>         Attachments: hbase-8372.patch, hbase-8372.v2.patch, 
> hbase-8372.v3.patch
>
>
> In discussion of HBASE-8347, it was proposed that CompoundConfiguration 
> should support mutability.
> This can be done by consolidating ImmutableConfigMap's on first modification 
> to CompoundConfiguration.

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