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LP bug #1035225 / MySQL bug #66301: INSERT ... ON DUPLICATE KEY UPDATE + innodb_autoinc_lock_mode=1 is broken The problem was that when certain INSERT ... ON DUPLICATE KEY UPDATE were executed concurrently on a table containing an AUTO_INCREMENT column as a primary key, InnoDB would correctly reserve non-overlapping AUTO_INCREMENT intervals for each statement, but when the server encountered the first duplicate key error on the secondary key in one of the statements and performed an UPDATE, it also updated the internal AUTO_INCREMENT value to the one from the existing row that caused a duplicate key error, even though the AUTO_INCREMENT value was not specified explicitly in the UPDATE clause. It would then proceed with using AUTO_INCREMENT values the range reserved previously by another statement, causing duplicate key errors on the AUTO_INCREMENT column. Fixed by changing write_record() to ensure that in case of a duplicate key error the internal AUTO_INCREMENT counter is only updated when the AUTO_INCREMENT value was explicitly updated by the UPDATE clause. Otherwise it is restored to what it was before the duplicate key error, as that value is unused and can be reused for subsequent successfully inserted rows. sql/sql_insert.cc: Don't update next_insert_id to the value of a row found during ON DUPLICATE KEY UPDATE. sql/sql_parse.cc: Added DBUG_SYNC sql/table.h: Added next_number_field_updated flag to detect changing of auto increment fields. Moved fields a bit to get bool fields after each other (better alignment) |
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