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I just did a fresh Drush installation, and now I have version 8.1.15.
When I run drush rr, I get the following error message.
The drush command 'rr' could not be found. Run
drush cache-clear drushto clear the commandfile cache if you have installed new extensions.
Even after running drush cache-clear, I still get that rr is not a known command.
Is this still available in Drush 8?
Take a look at https://www.drupal.org/project/registry_rebuild
The documentation is there:
How To Use Registry Rebuild With Drush
This is the preferred technique, and it should work with multisite installs.
You can just
drush @none dl registry_rebuild-7.xand drush will download it into your .drush folder. (Alternately, you can obtain the package another way and copy the folder into .drush yourself.)Make a backup of your database.
Clear Drush own cache with
drush cc drushOn a multisite install, either use correct drush alias, or cd into the site you're rebuilding, as in cd sites/mymultisite
Run
drush rrordrush @sitename rrfor soft rebuild (default), or: To force aggressive rebuild from scratch rundrush @sitename rr --fire-bazooka
That command (drush rr) is currently only for Drupal 7.
It does not matter what version of Drush you use since it is enabled for Drush via a module.
The module that enables that command does not work as of now for newer versions of Drupal.
--> Module link is https://www.drupal.org/project/registry_rebuild as stated in the answer by @FLY
drush cr.cc alldoesn't exist in 8.cris cache-rebuild and will do all of that including rebuild caches related to class discovery and annotations etc.