OpenStack Compute (nova)

optimistic concurrency support

Asked by Keith Tobin

Where the mysql database uses optimistic concurrency, will Openstack deal with catching the exception and retrying the transaction ?

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Tiantian Gao
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Keith Tobin (keith-tobin) said : 		#1

Found the answer, deadlock situations are supported in nova code.
Will check Openstack components and post here, if anyone can save me time looking through code, that would be a big help.

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Best Tiantian Gao (gtt116) said : 		#2

Hi Keith,

The main code to process sql connection failed sits here:
https://github.com/openstack/nova/blob/master/nova/openstack/common/db/sqlalchemy/session.py#L674

these code will be moved into 'oslo.db' which is a part of project 'oslo'
in the future.

Hoping that help you.
cheers,
gtt

2013/9/24 Keith Tobin <email address hidden>

> Question #236223 on OpenStack Compute (nova) changed:
> https://answers.launchpad.net/nova/+question/236223
>
> Keith Tobin gave more information on the question:
> Found the answer, deadlock situations are supported in nova code.
> Will check Openstack components and post here, if anyone can save me time
> looking through code, that would be a big help.
>
> --
> You received this question notification because you are an answer
> contact for OpenStack Compute (nova).
>

--
Best regards,
gtt

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Keith Tobin (keith-tobin) said : 		#3

Thanks ever so much, this saved me lots of looking.

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Keith Tobin (keith-tobin) said : 		#4

Thanks Tiantian Gao, that solved my question.