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From "ramkrishna.s.vasudevan (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 Thu, 28 Sep 2017 06:22:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16183725#comment-16183725
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ramkrishna.s.vasudevan commented on HBASE-18747:
------------------------------------------------

Do we have a JIRA to clean up the RegionObserver APIs related to these store level scanners
during flush/compactions?
Including to decide how to pass readPts, how are we going to pass existing already created
scanners etc? (like we have List<KVScanner>).

> 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
>            Priority: Critical
>             Fix For: 2.0.0-alpha-4
>
>
> 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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