MySQL Bugs: #91247: MTS ordered commit may cause deadlocks on the slaves

Bug #91247	MTS ordered commit may cause deadlocks on the slaves
Submitted:	14 Jun 2018 8:13	Modified:	16 Jul 2018 20:44
Reporter:	Christian Hansen	Email Updates:
Status:	Can't repeat	Impact on me:	None
Category:	MySQL Server: Replication	Severity:	S1 (Critical)
Version:	5.7.22	OS:	Ubuntu (16.04)
Assigned to:	MySQL Verification Team	CPU Architecture:	x86

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Description:
When i enable MTS on my slaves I get deadlocks where selects wont go through and hangs and waiting for table lock. So the server goes into a deadlock.

Why is this ?

If i remove MTS again and run single thread it works fine

Regards Christian

Denmark

How to repeat:
Enable MTS on the slaves with these configs. GTID is not enabled

slave_preserve_commit_order=1
slave_parallel_type=LOGICAL_CLOCK
slave_parallel_workers=3

Hi,
This is too broad description of the problem and I can't reproduce this. Can you give us a reproducible test case we can work with?

thanks
Bogdan