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https://issues.apache.org/jira/browse/HBASE-17584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15884746#comment-15884746
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Duo Zhang commented on HBASE-17584:
-----------------------------------
Adding methods to an interface will cause compilation error for sub classes. It
requires users to modify their code when upgrading from a previous version. Is
it acceptable on a minor version upgrading? If we allow this type of breaking
the compatibily(it is really a pain that we can not even add methods...), at
least we need to modify the section of 'HBase version number and compatibility'
in our hbase book.
Thanks.
> Expose ScanMetrics with ResultScanner rather than Scan
> ------------------------------------------------------
>
> Key: HBASE-17584
> URL: https://issues.apache.org/jira/browse/HBASE-17584
> Project: HBase
> Issue Type: Sub-task
> Components: Client, mapreduce, scan
> Affects Versions: 2.0.0, 1.4.0
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Fix For: 2.0.0, 1.4.0
>
> Attachments: HBASE-17584.patch
>
>
> I think this have been discussed many times... It is a bad practice to
> directly modify the Scan object passed in when calling getScanner. The reason
> that we can not use a copy is we need to use the Scan object to expose scan
> metrics. So we need to find another way to expose the metrics.
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