Convert row cache to row+filter cache
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Key: CASSANDRA-1956
URL: https://issues.apache.org/jira/browse/CASSANDRA-1956
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Stu Hood
Changing the row cache to a row+filter cache would make it much more useful. We
currently have to warn against using the row cache with wide rows, where the
read pattern is typically a peek at the head, but this usecase would be perfect
supported by a cache that stored only columns matching the filter.
Possible implementations:
* (copout) Cache a single filter per row, and leave the cache key as is
* Cache a list of filters per row, leaving the cache key as is: this is likely
to have some gotchas for weird usage patterns, and it requires the list
overheard
* Change the cache key to "rowkey+filterid": basically ideal, but you need a
secondary index to lookup cache entries by rowkey so that you can keep them in
sync with the memtable
* others?
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