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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18747) Introduce new example and helper classes to tell CP users how to do filtering on scanners
Date Fri, 13 Oct 2017 09:34:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16203300#comment-16203300
] 

Anoop Sam John commented on HBASE-18747:
----------------------------------------

Do we really need to expose the new Filter and the Wrapper to CPs now?  They can do this work
on their own right? Can use preFlush/preCompact and there we pass the actual scanner used
while doing the flush/compaction. They can return a wrapper impl and first the cells will
flow in there and they can do their logic.  I dont think we need give this filter. This will
only confuse with the client side filters. I agree these are just helpers.  Or else can just
move them to the example module itself. 

> Introduce new example and helper classes to tell CP users how to do filtering on scanners
> -----------------------------------------------------------------------------------------
>
>                 Key: HBASE-18747
>                 URL: https://issues.apache.org/jira/browse/HBASE-18747
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Coprocessors
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>            Priority: Critical
>             Fix For: 2.0.0-alpha-4
>
>         Attachments: HBASE-18747.patch
>
>
> Finally we decided that CP users should not have the ability to create {{StoreScanner}}
or {{StoreFileScanner}}, so it is impossible for them to filter out some cells when flush
or compaction by simply provide a filter when constructing {{StoreScanner}}.
> But I think filtering out some cells is a very important usage for CP users, so we need
to provide the ability in another way. Theoretically it can be done with wrapping an {{InternalScanner}},
but I think we need to give an example, or even some helper classes to help CP users.



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