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https://issues.apache.org/jira/browse/CASSANDRA-5519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13731589#comment-13731589
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Jonathan Ellis commented on CASSANDRA-5519:
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Good start, but it seems a little fragile to me if a bunch of sstables are
suddenly warmed up.
What about this?
We could define a fixed-size memory pool, similar to what we do for memtables
or cache, and allocate it to the sstables proportional to their hotness. Every
15 minutes (which seems like a lot, maybe hourly?) we recalculate and rebuild
the summaries. Maybe we only rebuild the ones that are X% off of where they
should be to make it lighter-weight. Or if we're downsampling by more than 2x
then we can just resample what we already have in memory instead of rebuilding
"correctly."
> Reduce index summary memory use for cold sstables
> -------------------------------------------------
>
> Key: CASSANDRA-5519
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5519
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Jonathan Ellis
> Priority: Minor
> Fix For: 2.0.1
>
>
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