Comment 1 for bug 1640029

Hi Sujai, thanks for reporting this. The issue is not yet clear to me.
Can you please provide:
- max_pool_size, retry_interval, max_overflow settings of your first run
- the nova error message of the first and the second run
- the neutron error message of the first and second run
At the moment you provided a neutron message for the first run and a nova message for the second. So I can't see what changed after updating the settings. In general it looks like that for deleting 500 instances in parallel a lot of sql queries are required. It seems like for such a use case you need to tune your parameters..

But let's compare your error message of the first and second run first. If they are equal, I tend to set this to invalid