worker threads mechanism does not allow for small number of volumes

[michael-db]

The external-health-monitor's worker thread mechanism (10 by default) is blind to the number of volumes. If there are fewer than 10 volumes then there is a burst of repeated probes of the same volume: if there is only one then there is a rapid fire succession of 10 probes of the same volume every minute.

This is not a high priority issue.

[xing-yang]

Have you observed this problem on both the controller and agent?

[michael-db]

I haven't looked at the controller. I was using only the agent. In the PVMonitorAgent code, you will see the checkPVWorker threads started together. Every monitorInterval, one picks an item from the queue, does its check, and requeues it - at which point (if there is only one volume attached to a pod) the next thread immediately pulls the requeued item and does the same thing, and so on, so that there are 10 successive checks for the same volume all at once.

This is not really a problem, it's just noisy and looks like a bug until you know why it's happening. Mitigation would be to reduce threads to 1 and decrease the interval. Ideally, monitorInterval would define an upper bound of on the polling frequency of any given volume, regardless of the number of threads.

[fengzixu]

Let me check the code and give your feedback. Thanks for your issue ❤️

[fengzixu]

/assign @fengzixu

[michael-db]

Thank you @fengzixu. Conceptually, this issue would be solved simply by putting the monitor interval delay after the volume is checked and before requeuing it to be checked again - though that would entail some reorganization of the code as it is currently structured.

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[fengzixu]

/remove-lifecycle rotten

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue.

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[winrouter]

the issue remain exist in v0.9.0

[xing-yang]

/reopen

[k8s-ci-robot]

@xing-yang: Reopened this issue.

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/reopen

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[xing-yang]

/remove-lifecycle rotten

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/lifecycle rotten

[michael-db]

/remove-lifecycle rotten

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/lifecycle rotten

[michael-db]

/remove-lifecycle rotten

[mowangdk]

/assign

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/lifecycle stale