Vladislav Vaintroub 1a2b494100 MDEV-23124 Eliminate the overhead of system call access() on every USE(or connection) ...

Make check_db_dir_existence() use a cache of existing directories
clear the cache whenever any directory is removed.

With this, the cost of check_db_dir_existence() will usually be a cost of
acquiring/releasing a non-contended readwrite lock in shared mode,
much less than going to the kernel and filesystem to check for file existence

2020-07-14 11:16:24 +02:00

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