exec:done status occaisonally overwriting complete status

What steps will reproduce the problem?
1. run a heap of jobs that complete (this is a rare race condition)

What is the expected output? What do you see instead?
They should all complete. occaisonally one 'sticks' in exec:done

Please use labels and text to provide additional information.
What's happening from debug is once in a blue moon, the thread handling the 
status POST request blocks in update_task_status at the task.save() line and 
the thread sleeps. The other status results continue to be processed to 
completetion, then finally the task unsleeps, and the exec:done status is 
save()d and over writes the complete status.

Original issue reported on code.google.com by retrogra...@gmail.com on 19 Jul 2012 at 6:57

google-code-export / yabi

exec:done status occaisonally overwriting complete status #251