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From "Daniel Doubleday (JIRA)" <>
Subject [jira] Updated: (CASSANDRA-1956) Convert row cache to row+filter cache
Date Fri, 21 Jan 2011 16:49:45 GMT


Daniel Doubleday updated CASSANDRA-1956:

    Attachment: 0001-row-cache-filter.patch

> Convert row cache to row+filter cache
> -------------------------------------
>                 Key: CASSANDRA-1956
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.7.0
>            Reporter: Stu Hood
>         Attachments: 0001-row-cache-filter.patch
> 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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