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https://issues.apache.org/jira/browse/HBASE-17584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15925581#comment-15925581
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Duo Zhang commented on HBASE-17584:
-----------------------------------

[~enis] If you mean {{AsyncTableResultScanner}}, it is intentional.

As you said, we haven't supported ScanMetrics for async client yet even if we 
enable metrics in scan.

And I have already filed HBASE-17691 for it. Will begin to work on it right 
after this issue get resolved.

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, HBASE-17584-v1.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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