switch to sha256 for hashing & better read performances
And maintain a pool of readers to not re-initialize them on every lookup which horribly hurts performances
Relates to: T3531
Migrated from D7036 (view on Phabricator)
Staging instance, all changes can be removed at any time
And maintain a pool of readers to not re-initialize them on every lookup which horribly hurts performances
Relates to: T3531
Migrated from D7036 (view on Phabricator)