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https://issues.apache.org/jira/browse/HBASE-6428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424484#comment-13424484
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Lars Hofhansl commented on HBASE-6428:
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Just looked at the current compaction code.
At the very least the Store.completeCompaction and Store.createWriterInTmp need
to be made public. In addition Store.completeCompaction has accept
Collection<StoreFile.Writer> instead of just a single StoreFile.Writer.
Need to dig a bit deeper, but these changes should allow a coprocessor to take
over compactions, write a new set of store files (maybe leveled, or time based)
and hook these new HFiles up with HBase.
> 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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