This message was deleted.

Do you mean increasing the setting without adding more resources? If so, then this would be expected. Is the server a single server deployment? or is it just for the Middle Manager? If this is just the Middle Manager, your worker.capacity should be set to 15 max because each worker will use a core and you want to leave one for management overhead. If this is a single node deployment, you'll need to consider the cores dedicated to each process. The broker, middle manager and historicals are the main consumers of CPU. Historical thread count (

druid.processing.numThreads

), Broker activity for queries and MM worker capacity (

druid.worker.capacity

) will drive CPU utilization, so you'll need to keep those parameters in balance to not over extend the 16 CPUs that you have and you'll need to leave some processing capacity for the other services (coordinator, overlord, ZK, router).

What did it increase it from / to?

I had increased Druid.worker.capacity

from what to what?