There will be three new tables:
- file
- filerevision
- deleted_files.
- (more?)
Details of the schema needs to be hashed out, added, and merged. Preferably with POC so you can try read and write locally and see how it looks like.
Description
Description
Details
Details
| Subject | Repo | Branch | Lines +/- | |
|---|---|---|---|---|
| [WIP] file: Basic support for writing to the new file tables | mediawiki/core | master | +237 -1 | |
| [WIP] New schema of file tables | mediawiki/core | master | +547 -0 |
| Status | Subtype | Assigned | Task | |
|---|---|---|---|---|
| · · · | ||||
| Open | Ladsgroup | T28741 Migrate file tables to a modern layout (image/oldimage; file/file_revision; add primary keys) | ||
| Open | Ladsgroup | T368113 Design and merge the new tables of file tables | ||
| · · · |
Event Timeline
Comment Actions
deleted_files
Note currently we do not use a table to store deleted pages. One of solutions in T20493: RFC: Unify the various deletion systems represents deleted pages using one bit field, so there are no need for a deleted pages (or archive/deleted revisions) table. Similarly we can use a bit field to indicate whether a file is deleted. This will also have the benefit of keeping the (upcoming) file ID upon deletion and undeletion.
Comment Actions
Per T28741#9912401, we may want a new table to stored normalized img_media_type, img_major_mime and img_minor_mime.
Comment Actions
Per parent task needed columns are:
file table:
- file_id
- file_latest
- file_name
- file_type (normalized type)
- file_delete
filerevision:
- fr_id
- fr_file
- fr_archive_name (if can not be generated automatically)
- fr_size
- fr_width
- fr_height
- fr_bits
- fr_description_id
- fr_actor
- fr_timestamp
- fr_metadata
- fr_type (normalized type)
- fr_deleted (for revdel)
- fr_sha1 (if we need to keep backwards compatibility)
- fr_delete (for normal deletion, unless unified with revdel - see T20493)
- fr_sha256
- fr_perceptual_hash
Comment Actions
This might affect some data we sqoop into HDFS and some of how we compute commons impact metrics or similar future metrics. We have to wait until a schema change is proposed to know for sure.
Comment Actions
I had to deprioritize this for a bit to deal with the aftermath of the outages. I will get back to it next week.
Comment Actions
Change #1091477 had a related patch set uploaded (by Ladsgroup; author: Amir Sarabadani):
[mediawiki/core@master] [WIP] New schema of file tables
Comment Actions
Change #1100125 had a related patch set uploaded (by Ladsgroup; author: Amir Sarabadani):
[mediawiki/core@master] [WIP] file: Basic support for writing to the new file tables
Comment Actions
Note: the proposed migration path seems not functionally separate deletion and revdel. See T20493#10389320 for why this is a bad idea for page.