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From "liu ming (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15076) Add getScanner(Scan scan, List<KeyValueScanner> additionalScanners) API into Region interface
Date Thu, 07 Jan 2016 15:00:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15087534#comment-15087534

liu ming commented on HBASE-15076:

Thanks Anoop,
We need this desperately , So sooner the better, 1.3 will be very appreciated.
And we hope it can be backport to earlier HBase version as well if possible.
And please help to make this change if you can , I am  trying to make a patch, but I am not
familiar with HBase development process, still trying to find document. So if you can help
to make the change, I can study how you did it. So thanks very much.

And if possible, could you briefly describe the process you make this patch? I spent two days
searching and reading, but still cannot get it clear..

> Add getScanner(Scan scan, List<KeyValueScanner> additionalScanners) API into Region
> ---------------------------------------------------------------------------------------------
>                 Key: HBASE-15076
>                 URL: https://issues.apache.org/jira/browse/HBASE-15076
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: liu ming
>            Assignee: liu ming
>             Fix For: 2.0.0
> HRegion method getScanner(Scan scan, List<KeyValueScanner> additionalScanners,
boolean copyCellsFromSharedMem) is protected.
> In Apache Trafodion, we need to invoke this getScanner method from a coprocessor. Since
it is protected, Trafodion must overload the HRegion class and overload this method into a
public method.
> It will be good to make this method public.
> It is very useful when one needs to combine several scan result in a single scanner.
> thanks,
> Ming

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