"
This series introduces a cache of already authenticated prepared statements which
is meant to optimize the prepared statement lookup when authentication is enabled.
This cache allows to perform a single cache lookup per EXECUTE operation as opposed
to at least 2 lookups: one in the prepared statements cache and one in the authentication
cache.
Tests:
- cql_query_test {debug, release}.
- cassandra-stress with authentication enabled and with short eviction timeout.
- Manual (with printouts) checks:
- Tested the eviction due to eviction in the prepared_statements_cache:
- Artificially decreased the prepared_statements_cache size and ran c-s with different keyspaces.
- Verified that the corresponding authorized_prepared_statements_cache entry is evicted and re-populated.
- Tested the BATCH of prepared statements (with dtest infrastructure):
- Verified that for each prepared statement authorized_prepared_statements_cache is updated only once:
- The batch contained a few entries of the same prepared statement.
"
* 'authorized_prepared_statements_cache-v3' of https://github.com/vladzcloudius/scylla:
cql3: use authorized_prepared_statements_cache in the BATCH processing
cql3::statements::batch_statement: introduce a single_statement class
cql3: introduce the authorized_prepared_statements_cache class
loading_shared_values: introduce the templated find() overload
tests: loading_cache_test: add a tests for a loading_cache::remove(key)/remove(iterator)
utils::loading_cache: add remove(key)/remove(iterator) methods
cql3::query_processor: properly stop() prepared_statements_cache object
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