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feat: Improve device allocation reliability in high churn scenarios#253
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gauravkghildiyal merged 2 commits intogoogle:mainfrom Oct 13, 2025
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This commit introduces configurable rate limiting for the inventory discovery process. Previously, a fixed 5-second rate limit with a burst of 1 could delay processing of netlink updates, leading to failures during high pod churn scenarios. Command-line flags have been added to control the inventory discovery rate limit and burst size. The default values have been adjusted to be more responsive to rapid pod lifecycle events, ensuring that device state is updated promptly.
Previously, if a device was released by a pod and immediately claimed by another, the inventory might not have had a chance to update. Now, if a device is not found in the local store, a new scan is triggered to ensure that newly available devices are discovered before failing. This improves the reliability of device allocation during high pod churn.
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michaelasp
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michaelasp
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The rate limiter for publishing inventory state to the Kubernetes API server is now configurable. The default minimum interval between ResourceSlice updates has been reduced from 5 seconds to 2 seconds, with a burst of 5. This ensures that (only) when inventory changes, i.e.
dranet/pkg/inventory/db.go
Line 116 in 51b8a6c
An on-demand scan is now triggered if a requested device is not found in the local cache. This resolves allocation failures caused by race conditions where a device is released and immediately re-claimed (by a different pod). The scan instantly updates the driver's local state, ensuring newly freed devices are immediately available for allocation, independent of the rate-limited ResourceSlice update.