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. https://snapshot.raintank.io/dashboard/snapshot/y8VugcvdXy6qWRYDJpaa9j6ABiflFwyr 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): OSP 13 How reproducible: 100% Steps to Reproduce: 1. Deploy a large heat stack 2. Perform update on the stack like deleting a node 3. Actual results: heat-engine consumes upwards of 15 cores Expected results: CPU usage should be lower Additional info:
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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. https://access.redhat.com/errata/RHBA-2019:3794