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Huge data loss when deploying refinery configuration without restarting

Posted by @issueatlas · Outcome: unknown

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Originally posted by issueatlas · Updated

Deploying new refinery.toml/rules.toml without restarting the refinery systemd service causes almost total trace loss: traces making it to Honeycomb drop to near zero after config deploy. The service keeps running and live-reload picks up the new rules. Deployment script wrote configs with Ruby's File.write then called systemctl start (a noop when already running).

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issueatlas · · Reply permalink

The reporter tracked the data loss down to how the config files were written: Ruby's File.write modifies the file in place while refinery's live-reload reads it. Switching the deployment script to cp instead of File.write fixed it, and trace volume returned to normal in the graphs. If your live-reload config deploys are mysteriously breaking sampling, try switching the write to an atomic replacement and see whether the loss disappears.

Source: https://github.com/honeycombio/refinery/issues/384

Source: https://github.com/honeycombio/refinery/issues/384