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https://issues.apache.org/jira/browse/HBASE-20045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16380623#comment-16380623
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Anoop Sam John commented on HBASE-20045:
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Thanks for checking ad confirming the compaction case. Ya it make sense NOT to
cache when writing the compacted new file. It would be good to test your idea.
We will be doing some R+W tests. Any chance for a patch soon?
> When running compaction, cache recent blocks.
> ---------------------------------------------
>
> Key: HBASE-20045
> URL: https://issues.apache.org/jira/browse/HBASE-20045
> Project: HBase
> Issue Type: New Feature
> Components: BlockCache, Compaction
> Affects Versions: 2.0.0-beta-1
> Reporter: Jean-Marc Spaggiari
> Priority: Major
>
> HBase already allows to cache blocks on flush. This is very useful for
> usecases where most queries are against recent data. However, as soon as
> their is a compaction, those blocks are evicted. It will be interesting to
> have a table level parameter to say "When compacting, cache blocks less than
> 24 hours old". That way, when running compaction, all blocks where some data
> are less than 24h hold, will be automatically cached.
>
> Very useful for table design where there is TS in the key but a long history
> (Like a year of sensor data).
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