[jira] [Commented] (HBASE-17584) Expose ScanMetrics with ResultScanner rather than Scan

["Duo Zhang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-17584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15849915#comment-15849915 ] 

Duo Zhang commented on HBASE-17584:
-----------------------------------

[~stack] FYI.

When reading the code, I found that an important usage of scan metrics is the counter of map reduce job. So I've added a mapreduce component for this issue.

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
>             Fix For: 2.0.0, 1.4.0
>
>
> 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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