b01e773d2b
* feat: store split modulestore's course indexes in Django/MySQL Course outline generation is calling active_versions hundreds or even thousands of times on course_publish. In practice, the handling of a block requires a fetch of the course index. That requires a call to the active_versions table for each touching of a block. In larger courses, that can mean 1000s of calls to the db to retrieve them. A quick solution to this problem is to use a request cache, so we don't have to query the slow db every time and memoize the relevant data [An example run can be seen here.](https://one.newrelic.com/launcher/nr1-core.explorer?platform[filters]=IihuYW1lIGxpa2UgJ3Byb2QtZWR4LWVkeGFwcCcgb3IgaWQgPSAncHJvZC1lZHgtZWR4YXBwJyBvciBkb21haW5JZCA9ICdwcm9kLWVkeC1lZHhhcHAnKSBhbmQgKG5hbWUgbGlrZSAnbG1zJyBvciBpZCA9ICdsbXMnIG9yIGRvbWFpbklkID0gJ2xtcycpIg==&platform[accountId]=88178&platform[timeRange][begin_time]=1626715880701&platform[timeRange][end_time]=1627320680701&pane=eyJuZXJkbGV0SWQiOiJhcG0tbmVyZGxldHMudHJhbnNhY3Rpb25zIiwiZW50aXR5R3VpZCI6Ik9EZ3hOemg4UVZCTmZFRlFVRXhKUTBGVVNVOU9mRFk1TVRNM05EUTROQSIsInNlbGVjdGVkU2VyaWVzIjoiZjAzYjNmNzY5OTQ0MjlmOTFhYWQ4MDBkNTEwZTU5MDM5OWNjMzNhMSIsImRyaWxsZG93biI6eyJ0cmFuc2FjdGlvbk5hbWUiOiJPdGhlclRyYW5zYWN0aW9uL0NlbGVyeS9jbXMuZGphbmdvYXBwcy5jb250ZW50c3RvcmUudGFza3MudXBkYXRlX291dGxpbmVfZnJvbV9tb2R1bGVzdG9yZV90YXNrIn19&cards[0]=eyJuZXJkbGV0SWQiOiJhcG0tbmVyZGxldHMudHJhbnNhY3Rpb24tdHJhY2UiLCJ0cmFjZUlkIjoiY2I2OGNkMDktZWI5Yi0xMWViLWJkY2QtMDI0MmFjMTEwMDBlXzI1MjU0MV8zMTgzMTMiLCJlbnRpdHlHdWlkIjoiT0RneE56aDhRVkJOZkVGUVVFeEpRMEZVU1U5T2ZEWTVNVE0zTkRRNE5BIn0=&sidebars[0]=eyJuZXJkbGV0SWQiOiJucjEtY29yZS5hY3Rpb25zIiwic2VsZWN0ZWROZXJkbGV0Ijp7Im5lcmRsZXRJZCI6ImFwbS1uZXJkbGV0cy50cmFuc2FjdGlvbnMifSwiZW50aXR5R3VpZCI6Ik9EZ3hOemg4UVZCTmZFRlFVRXhKUTBGVVNVOU9mRFk1TVRNM05EUTROQSJ9&state=d9946155-ea53-cb11-c1c0-cc873d6c7d39) Useful information to include: In theory, this should provide a minor performance boost to authors and learners, and be noticeable in the above function trace, once live on prod. Note, that in several places the cache must be invalidated, as to prevent a stale cache. Co-authored-by: Braden MacDonald <braden@opencraft.com>
Open edX -------- This is the root package for Open edX. The intent is that all importable code from Open edX will eventually live here, including the code in the lms, cms, and common directories. If you're adding a new Django app, place it in core/djangoapps. If you're adding utilities that require Django, place them in core/djangolib. If you're adding code that defines no Django models or views of its own but is widely useful, put it in core/lib. Note: All new code should be created in this package, and the legacy code will be moved here gradually. For now the code is not structured like this, and hence legacy code will continue to live in a number of different packages.