During "Online" DDL, Some DML Waits On Semaphore Last Locked In "btr0bulk.cc line 53"
(Doc ID 2480928.1)
Last updated on MARCH 14, 2019
Applies to:MySQL Server - Version 5.7 and later
Information in this document applies to any platform.
An otherwise non-locking ALTER TABLE .. ADD KEY leads to an expected long semaphore wait near the end.
InnoDB status show it like this: (note: btr0bulk.cc line 53 )
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