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.
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@ -417,7 +417,7 @@ void upgrade_lock_type(THD *thd, thr_lock_type *lock_type,
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if (duplic == DUP_UPDATE ||
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duplic == DUP_REPLACE && *lock_type == TL_WRITE_CONCURRENT_INSERT)
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{
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*lock_type= TL_WRITE;
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*lock_type= TL_WRITE_DEFAULT;
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return;
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}
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