[NIFI-12322] Add resource usage documentation for ElasticSearchClientServiceImpl

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0-M1, 1.24.0
• Component/s: Documentation & Website, Extensions
• Assignee: Pierre Villard
• Reporter: Pierre Villard
• Created: 06/Nov/23 16:39
• Updated: 06/Nov/23 18:03
• Resolved: 06/Nov/23 18:03

Description

We observed a significant resource usage when using many ES controller service instances. After investigation, it appears that the ES client relies on a RestClient where the Apache Http Async Client starts by default one dispatcher thread, and a number of worker threads used by the connection manager, as many as the number of locally detected processors (depending on what Runtime.getRuntime().availableProcessors() returns).

I think it'd be worth adding this in the documentation and the proper annotation where relevant.

Issue Links

• links to: GitHub Pull Request #7986