We solved this problem. Hibernate use reflection during initialization
process, but reflection depends on reading files from file system.
It seems that in GAE there is a problem with reading files (including
.class files) and sometimes this process can be quite long.
The solution is very simple - to pack all compiled files to jar and deploy
project like one file. In GAE SDK 1.7.4. there is an opportunity to deploy
project by command file (by appcfg) as one jar using --enable_jar_classes
flag.
Now everything work absolutely correct without random performance collapses.
Понеділок, 18 лютого 2013 р. 11:51:46 UTC+2 користувач Oleg Bashtenko
написав:
>
> Hi!
> I'm using CloudSQL with Hibernate (v 4.1.7), and sometimes opening new
> connection to CloudSQL takes too much time. More specific, the problem is
> in initialization of Bytecode provider. Usually it takes about 5 seconds,
> but sometimes up to 40-50 seconds! This problem causes
> DeadlineExceededException for such requests. I was unable to find any
> information regarding this type of problem.
>
> Could someone please help me with this problem? Our app id is
> "teamwork-ms".
>
> Here is a part of the log entry (notice the time for records in bold):
> I2013-02-13 22:15:17.586
> com.teamwork.tms.server.api.WarmupServlet init: Initiate Google CloudSQL
> database connection on startup
> I2013-02-13 22:15:20.761
> org.hibernate.annotations.common.Version <clinit>: HCANN000001: Hibernate
> Commons Annotations {4.0.1.Final}
> I2013-02-13 22:15:20.865
> org.hibernate.Version logVersion: HHH000412: Hibernate Core {4.1.7.Final}
> I2013-02-13 22:15:20.871
> org.hibernate.cfg.Environment <clinit>: HHH000206: hibernate.properties
> not found
> I*2013-02-13 22:15:20.876*
> *org.hibernate.cfg.Environment buildBytecodeProvider: HHH000021: Bytecode
> provider name : javassist*
> W*2013-02-13 22:16:11.152*
> *org.hibernate.mapping.RootClass checkCompositeIdentifier: HHH000038:
> Composite-id class does not override equals():
> com.teamwork.tms.server.sql_entities.auxiliary.pk.ApplicationCompanyScopePK
> *
> W2013-02-13 22:16:11.153
> org.hibernate.mapping.RootClass checkCompositeIdentifier: HHH000039:
> Composite-id class does not override hashCode():
> com.teamwork.tms.server.sql_entities.auxiliary.pk.ApplicationCompanyScopePK
>
> Thanks in advance!
>
>
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