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https://issues.apache.org/jira/browse/HBASE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424464#comment-13424464
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Lars Hofhansl commented on HBASE-6427:
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bq. I'd not be opposed to adding additional hooks but that should be after
exhausting other options here, IMHO, since they would be "close" to each other.
Do you think the latest proposal is too heavy handed?
pre{Flush|Compact}ScannerOpen would be quite close to pre{Flush|Compact}. My
reasoning was that an implementer could still override the relatively simple
pre{Flush|Compact} hooks.
If these are too many, we can still have only the fewer hooks, and then we'd
need some "NullScanner" approach I think.
> 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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