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https://issues.apache.org/jira/browse/HBASE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423374#comment-13423374
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Andrew Purtell commented on HBASE-6427:
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bq. The default behavior is followed when RegionObserver.pre{flush|compact}
return a null scanner, which is what BaseRegionObserver does by default.
Fine, I was misled by the unit test code.
bq. I think we'd need a preStoreScannerOpen, which would be called in
Store.getScanner (right before the new StoreScanner is created) to allow the
coprocessor to return a custom scanner here too.
Sounds good to me.
> 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
> Priority: Minor
> Attachments: 6427-notReady.txt, 6427-v1.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.
> 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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