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https://issues.apache.org/jira/browse/HBASE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13422438#comment-13422438
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Lars Hofhansl commented on HBASE-6427:
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Upon further scrutiny, that would actually not work, because any external code
would have no knowledge about the internal memstoreTSs.
Perhaps a better option would be to make the expiration policy of a column
family pluggable. That way TTL and # versions could be controlled from the
outside.
> Pluggable policy for smallestReadPoint in HRegion
> -------------------------------------------------
>
> Key: HBASE-6427
> URL: https://issues.apache.org/jira/browse/HBASE-6427
> Project: HBase
> Issue Type: New Feature
> Reporter: Lars Hofhansl
> Priority: Minor
>
> 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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