Created attachment 802048 [details]
the relevant logs of the errors

Description of problem:
When stopping postgresql, it will sometime report the error:

Unable to complete the requested operation due to: Failed to correctly execute all parallel operations. 

Specifically, there were 5 jobs running against 1 large instance simultaneously. Please refer to the attached development.log for more info of the error.

Version-Release number of selected component (if applicable):
devenv_3816

How reproducible:
sometimes (of low frequency, only 2/29 postgresql cases failed due to this error. Have not found other cases failed by this problem yet.)

Steps to Reproduce:
1. create an app with postgresql db added
2. try to stop the postgresql cartridge
3.

Actual results:
Stopping the postgresql cartridge would sometimes fail with the error:

rhc cartridge stop postgresql-9.2 -a oprtj0 -l nimbeutz -p 'redhat' --insecure --server ec2-54-242-42-194.compute-1.amazonaws.com
Stopping postgresql-9.2 ... Unable to complete the requested operation due to: Failed to correctly execute all parallel operations.
Reference ID: 045f4eca49ceb89c04e58c70c82bedd8

Expected results:
Stopping the postgresql cartridge should be successful.

Additional info: