Bug#28587 SELECT is blocked by INSERT waiting on read lock, even with low_priority_updates
The problem is that a SELECT on one thread is blocked by INSERT ... ON DUPLICATE KEY UPDATE on another thread even when low_priority_updates is activated. The solution is to possibly downgrade the lock type to the setting of low_priority_updates if the INSERT cannot be concurrent. sql/sql_insert.cc: Possibly downgrade lock type to the the setting of low_priority_updates if if the INSERT cannot be concurrent.
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