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https://issues.apache.org/jira/browse/CASSANDRA-3534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13157391#comment-13157391
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Jonathan Ellis commented on CASSANDRA-3534:
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Then you will be able to say "use X amount of memory for memtables, Y amount
for the cache (and monitor Z amount for the bloom filters)" which makes the
old "pressure valve" code obsolete.
> Enhance memory emergency pressure valve
> ---------------------------------------
>
> Key: CASSANDRA-3534
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3534
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 1.1
> Reporter: Vijay
> Assignee: Vijay
> Priority: Minor
>
> Seems like when these thresholds are reached we are trying to reduce the
> keycache and Memtable sizes, but in the trunk memtable is moved off-heap
> hence reducing that will not actually help.
> Reducing the keycache might help but we might want to provide a way to bring
> the cache level back to the configured value when the pressure goes away.
> Conversation from IRC: we might want to remove these setting all together
> after global keycache.
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