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https://issues.apache.org/jira/browse/CASSANDRA-1657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis resolved CASSANDRA-1657.
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Resolution: Later
> support in-memory column families
> ---------------------------------
>
> Key: CASSANDRA-1657
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1657
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Peter Schuller
> Priority: Minor
>
> Some workloads are such that you absolutely depend on column families being
> in-memory for performance, yet you most definitely want all the things that
> Cassandra offers in terms of replication, consistency, durability etc.
> In order to semi-deterministically ensure acceptable performance for such
> data, Cassandra could support in-memory column families. Such an in-memory
> column family would imply that mlock() be used on sstables for this column
> family. On start-up and on compaction completion, they could be mmap():ed
> with MAP_POPULATE (Linux specific) or else just mmap():ed + mlock():ed in
> such a way as to otherwise guarantee it is in-memory (such as userland
> traversal of the entire file).
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