Page MenuHomePhabricator

[FlaggedRevs] backend/schema/mysql/FlaggedRevs.sql : Error: 1071 Specified key was too long; max key length is 767 bytes
Open, Needs TriagePublic

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 TABLE IF NOT EXISTS `flaggedtemplates` (
 ft_rev_id integer unsigned NOT NULL,
 ft_namespace int NOT NULL default '0',
 ft_title varchar(255) binary NOT NULL default '',
 ft_tmp_rev_id integer unsigned NULL,
 PRIMARY KEY (ft_rev_id,ft_namespace,ft_title)
 ) ENGINE=InnoDB
 
Function: Wikimedia\Rdbms\Database::sourceFile( /workspace/src/extensions/FlaggedRevs/backend/schema/mysql/FlaggedRevs.sql )
Error: 1071 Specified key was too long; max key length is 767 bytes (localhost:/tmp/quibble-mysql-5u5evtc_/socket)

Event Timeline

hashar created this task.May 1 2018, 7:26 PM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptMay 1 2018, 7:26 PM
Vvjjkkii renamed this task from [FlaggedRevs] backend/schema/mysql/FlaggedRevs.sql : Error: 1071 Specified key was too long; max key length is 767 bytes to 2udaaaaaaa.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 2udaaaaaaa to [FlaggedRevs] backend/schema/mysql/FlaggedRevs.sql : Error: 1071 Specified key was too long; max key length is 767 bytes.Jul 1 2018, 11:41 AM
Mainframe98 raised the priority of this task from High to Needs Triage.
Mainframe98 updated the task description. (Show Details)
Mainframe98 added a subscriber: Aklapper.