Intelligent RAM Caching
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Key: CASSANDRA-791
URL: https://issues.apache.org/jira/browse/CASSANDRA-791
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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