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[GlobalUsage] patches/GlobalUsage.sql : Error: 1071 Specified key was too long; max key length is 767 bytes
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Description

When running MySQL/MariaDB with charset utf8mb4, a character is 4 bytes. Hence a key created on a VARCHAR(255) takes 255 characters * 4 bytes/characters = 1020 bytes. However Innodb defaults to a maximum of 767 bytes for an index.

The extension fails to install on Debian Stretch which uses utf8mb4 as the default charset:

Query: CREATE UNIQUE INDEX globalimagelinks_to_wiki_page
 ON `globalimagelinks` (gil_to, gil_wiki, gil_page)
 
Function: Wikimedia\Rdbms\Database::sourceFile( /workspace/src/extensions/GlobalUsage/patches/GlobalUsage.sql )
Error: 1071 Specified key was too long; max key length is 767 bytes (localhost:/tmp/quibble-mysql-deferw2q/socket)

Event Timeline

hashar created this task.May 1 2018, 7:28 PM
Restricted Application added a project: Multimedia. · View Herald TranscriptMay 1 2018, 7:28 PM
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Vvjjkkii renamed this task from [GlobalUsage] patches/GlobalUsage.sql : Error: 1071 Specified key was too long; max key length is 767 bytes to 0udaaaaaaa.Jul 1 2018, 1:12 AM
Vvjjkkii triaged this task as High priority.
Vvjjkkii updated the task description. (Show Details)
Vvjjkkii removed a subscriber: Aklapper.
Mainframe98 renamed this task from 0udaaaaaaa to [GlobalUsage] patches/GlobalUsage.sql : Error: 1071 Specified key was too long; max key length is 767 bytes.Jul 1 2018, 11:42 AM
Mainframe98 updated the task description. (Show Details)
Mainframe98 added a subscriber: Aklapper.
Ankry raised the priority of this task from High to Needs Triage.Jul 2 2018, 3:26 PM