[openstack-dev] [heat] Convergence - persistence desired and observed state
Qiming Teng
tengqim at linux.vnet.ibm.com
Wed Sep 17 13:22:09 UTC 2014
On Wed, Sep 17, 2014 at 12:27:34PM +0000, Gurjar, Unmesh wrote:
> Hi All,
>
> The convergence blueprint (https://review.openstack.org/#/c/95907/) introduces two new database tables (resource_observed and resource_properties_observed ) for storing the observed state of a resource (currently under review: https://review.openstack.org/#/c/109012/).
>
> However, it can be simplified by storing the desired and observed state of a resource in the resource table itself (two columns in the form of a blob storing a JSON). Please let me know your concerns or suggestions about this approach.
>
> Thanks,
> Unmesh G.
It doesn't sounds like a good idea to me unless we have some plans to
handle potential concurrency and compatibility issues.
Regards,
Qiming
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