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# exposed
m

Miclebrick

11/08/2018, 3:06 AM
Howdy, I'm having issues with database calls freezing on socketRead0, I got a 
SHOW PROCESSLIST
& 
SHOW ENGINE INNODB STATUS
output via CLI this time: https://gist.github.com/Miclebrick/8622e4542a7f246bb1f3a8dcda951ba7 Can anyone help me out?
Seems like there's a lot of "waiting for table metadata lock"?
t

tapac

11/08/2018, 5:46 AM
Your engine status looks strange, because there is no any information about all that waiting transactions. Are you sure that both queries were executed simulationally?
m

Miclebrick

11/08/2018, 11:09 PM
Do you mean simultaneously? I ran those queries manually, but the issue was happening the whole time
processListDump.txt
processListDump.txt
innoDbStatusDump.txt
innoDbStatusDump.txt
These were generated by the application when it happened, at the same exact second
Could manually calling 
commit()
cause this?
https://gist.github.com/Miclebrick/7c57f3bd2cd69691868623693cf26352 i set wait_timeout to something shorter, now i get this error instead of it breaking everything
t

tapac

11/09/2018, 9:09 AM
Looks like you run 
SHOW ENGINE INNODB STATUS
under 
test
user while most of queries made by 
root
user. Could you show result of 
show variables like 'max_connections'
?
m

Miclebrick

11/13/2018, 11:37 AM
Max connections was at 151, but I actually got an out of connections issue so I increased it to 300. Sorry for the late reply
@tapac i'm still having these issues 😞 any other tips to try and find out more?
t

tapac

11/16/2018, 6:23 AM
1. Could you show new 
SHOW PROCESSLIST
output? 2. Could you connect as 
root
user and make 
SHOW ENGINE INNODB STATUS
3. Do you use only 
test
user connections in your app or also 
root
users?
m

Miclebrick

11/17/2018, 3:10 AM
3. test is used by the test server, root is used by the production server
https://gist.github.com/Miclebrick/256e4110ecf3f26931a016efadfe6e82#file-gistfile1-txt-L294 transaction here is active for 200+ seconds, that can't be normal
t

tapac

11/21/2018, 9:01 AM
There are two transactions with 460+ seconds, witch could also be the cause, but could you tell me how much records do you have in plan_users/plan_servers/plan_ping tables and do you have an index on 
uuid
fields?
m

Miclebrick

11/21/2018, 7:07 PM
uh, I don't know anything about that plugins data, it's not one of mine, its this: https://github.com/Rsl1122/Plan-PlayerAnalytics do you think it could be the cause? And how do I get that information?
t

tapac

11/22/2018, 11:02 AM
You may call 
SHOW CREATE TABLE _table_name_
to see full table creation script with all indices/keys. Could you tell me, 
INSERT INTO plan_ping (user_id, server_id, date, min_ping, max_ping, avg_ping) VALUES ((SELECT plan_users.id FROM plan_users WHERE (uuid='aced95a8-422a-483c-99ed-611759f0dcad') LIMIT 1), (SELECT plan_servers.id FROM plan_servers WHERE (plan_servers.uuid='7db4c4e5-248e-37a8-a3e1-1d6f88840218') LIMIT 1), 1542424198514, 86, 87, 86.0)
is written on Exposed?
m

Miclebrick

11/23/2018, 3:24 AM
Plan tables: https://gist.github.com/Miclebrick/eeab6e38bbe2c50b184000a7a9372564 Might be worth noting the Plan is on a different database ("plan" instead of "minecraft"). Despite that, do you think it could somehow be Plan causing the issue?
And, the query you quoted, is not made by Exposed, it is written by Plan which does not use Kotlin or Exposed (assuming I understood the question)
It seems to pretty consistently be hanging on inserts to a certain few tables
I know this is probably a terrible solution, but I'm pretty desperate here; Will this work? https://gist.github.com/Miclebrick/0ec8182d176bee258ed0e81e184b03a8
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