support in-memory column families
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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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