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https://issues.apache.org/jira/browse/HBASE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424655#comment-13424655
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Lars Hofhansl commented on HBASE-6427:
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Thinking on this more... I think the pre{Flush|Compact}ScannerOpen hooks should
just continue to return InternalScanner. Only that interface is needed by
downstream code and we should not extend this only so that coprocessor chaining
becomes simpler.
As it stands these hooks *can* use the passed InternalScanner, but it needs
some understanding of HBase... Which is needed anyway to correctly deal with
chained scanners for flush or compactions.
I.e. I propose leaving it with what the current patch provides. Not opposed to
filing a separate ticket to bring more sense into the various scanner
interfaces we have.
> Pluggable compaction policies via coprocessors
> ----------------------------------------------
>
> Key: HBASE-6427
> URL: https://issues.apache.org/jira/browse/HBASE-6427
> Project: HBase
> Issue Type: New Feature
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Priority: Minor
> Attachments: 6427-notReady.txt, 6427-v1.txt, 6427-v2.txt,
> 6427-v3.txt, 6427-v4.txt, 6427-v5.txt, 6427-v7.txt
>
>
> When implementing higher level stores on top of HBase it is necessary to
> allow dynamic control over how long KVs must be kept around.
> Semi-static config options for ColumnFamilies (# of version or TTL) is not
> sufficient.
> This can be done with a few additional coprocessor hooks, or by makeing
> Store.ScanInfo pluggable.
> Was:
> The simplest way to achieve this is to have a pluggable class to determine
> the smallestReadpoint for Region. That way outside code can control what KVs
> to retain.
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