Piotr Grabowski 6537dc6126 loading_cache_test: test prepared stmts cache ...

Add a new test that sets up a CQL environment with a very small prepared 
statements cache. The test reproduces a scenario described in #10440,
where a privileged section of prepared statement cache gets large
and that could possibly starve the unprivileged section, making it
impossible to execute BATCH statements. Additionally, at the end of the 
test, prepared statements/"simulated batches" with prepared statements 
are executed a random number of times, stressing the cache.

To create a CQL environment with small prepared cache, cql_test_config
is extended to allow setting custom memory_config value.

2022-04-29 19:22:55 +02:00

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