Make keys/rows cached more safe
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Key: CASSANDRA-1445
URL: https://issues.apache.org/jira/browse/CASSANDRA-1445
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Jeremy Hanna
Priority: Minor
Currently when a user sets keys/rows cached for their column families, they do
at their own risk. If you cache too much information, you will get an OOM
error on the server and crash the server.
This improvement would be to make that configuration safer.
In order to accomplish this, we could add a configuration option for size of
cache (for either). The server would be able to see how much data is expected
to be cached based on column family settings and make a best effort to cache
it. However, it would not exceed that maximum value for the node (by some form
of approximation). Instead it would weight the different values for caching
and satisfy the expectation as best it can. So it would potentially cache less
than was requested, but at least it would not crash the server.
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