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https://issues.apache.org/jira/browse/CASSANDRA-5515?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13726753#comment-13726753
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Tyler Hobbs commented on CASSANDRA-5515:
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bq. Maybe get fancy and do a reservoir-sampling histogram? Metrics makes that
easy.
I could see that being useful during steady state, but there doesn't appear to
be an easy way to serialize and rebuild those, which either means we would need
a somewhat custom implementation, or we wouldn't have reliable information on
startup. (The custom implementation could support dump and restore, or perhaps
just expose a notion of "confidence".)
Perhaps we should spend some time looking at the use cases before investing too
much effort in this?
> Track sstable coldness
> ----------------------
>
> Key: CASSANDRA-5515
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5515
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Tyler Hobbs
> Fix For: 2.0.1
>
> Attachments: 0001-Track-row-read-counts-in-SSTR.patch
>
>
> Keeping a count of reads per-sstable would allow STCS to automatically ignore
> cold data rather than recompacting it constantly with hot data, dramatically
> reducing compaction load for typical time series applications and others with
> time-correlated access patterns. We would not need a separate age-tiered
> compaction strategy.
> (This will really be useful in conjunction with CASSANDRA-5514.)
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