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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Resolved: (CASSANDRA-791) Intelligent RAM Caching
Date Sun, 14 Feb 2010 22:29:28 GMT


Jonathan Ellis resolved CASSANDRA-791.

    Resolution: Duplicate

yes.  James, see CASSANDRA-678 and CASSANDRA-688.

> Intelligent RAM Caching
> -----------------------
>                 Key: CASSANDRA-791
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: James Churchman
> It should be possibly to predefine what cassandra holds in-momory and what it does not,
or the priority of data to be cached.
> An example would be a column family that stores huge amount of logs of user data, but
the user rarely every access that data once it has been inserted. The other column family
is the login details of each user, probably very tiny but all of it accessed hundreds of times
day. When the large column family is updated i presume that all data healed in ram from the
smaller one is  removed from the ram? it would be preferable that priorities or specific "ram
quotas" could be assigned to each column family to determine how lightly it is for the data
to stay in ram. This would mean that memory caching programs like mem-cache that have that
slightly finer level of control (by allocating each individual mem-chache a total amount of
ram) would no longer be needed and it would simplify system design

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