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https://issues.apache.org/jira/browse/HBASE-6428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419710#comment-13419710
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Lars Hofhansl commented on HBASE-6428:
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As it stands the Coprocessor could at best function as a post filter. In this
case that might be good enough, though. preCompact could skip the normal
processing and use the passed internalScanner and then write to multiple store
files; for example based on TS.
HBASE-6427 is different in that there I want "unfilter" something, so any
coprocessor hooks would have to be deeper in the stack.
> Pluggable Compaction policies
> -----------------------------
>
> Key: HBASE-6428
> URL: https://issues.apache.org/jira/browse/HBASE-6428
> Project: HBase
> Issue Type: New Feature
> Reporter: Lars Hofhansl
>
> For some usecases is useful to allow more control over how KVs get compacted.
> For example one could envision storing old versions of a KV separate HFiles,
> which then rarely have to be touched/cached by queries querying for new data.
> In addition these date ranged HFile can be easily used for backups while
> maintaining historical data.
> This would be a major change, allowing compactions to provide multiple
> targets (not just a filter).
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