Description of problem:
At a stack size of 250+ nodes, any minor operation on the stack such as deleting a single node also leads to very high CPU consumption by heat-engine workers. This could lead to major problems and slowdowns, especially if the VM has not been properly sized.
The peaks in above graph point to scale ups/down and node deletes.
There are 25 heat-engine workers and #executor_thread_pool_size = 64
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Deploy a large heat stack
2. Perform update on the stack like deleting a node
heat-engine consumes upwards of 15 cores
CPU usage should be lower
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Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.