Sergey Vojtovich b123249010 MDEV-5792 - Deadlock between SELECTs from METADATA_LOCK_INFO and another ...

I_S table

mdl_iterate() helper function (which is used by the plugin to iterate mdl
locks) acquired mutexes in reverse order.

Fixed by iterating MDL locks in two stages:
1. Iterate locks hash under the protection of hash mutex, store all
   lock pointers in a thread local array and increment reference counter
   for the lock.
2. Iterate local array without protection of hash mutex, handle destroyed
   locks.

It somewhat echoes hack in MDL_map_partition::move_from_hash_to_lock_mutex.

2014-04-23 11:34:06 +04:00

95 KiB

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