QA » openQA Project

Motivation¶

With #157690 the amount of connected online workers is already limited based on a configuration variable. We can extend that to limit based on the actual websocket+scheduler load meaning to keep the number low enough to ensure proper operation of websocket+scheduler to prevent problems like #157666.

Acceptance criteria¶

• AC1: A clear definition of "websocket+scheduler load" exists
• AC2: The number of online workers is limited to min(configured_number,configured_load_limit)
• AC3: Rejected openQA workers exceeding the mentioned limit(s) explicitly log or fail that situation

Suggestions¶

• Look into the implemention of #157690 to see how the simple limit was implemented so far
• Come up with a definition of the critical websocket+scheduler load based on "overload experiments" which can be used as a metric for the problem seen in #157666
• Extend the simple limit with a lookup of the said metric and also prevent additional worker connections based on the metric
• Also consider disconnecting already connected workers if the metric exceeds the configured threshold