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High CPU usage after etcd connection is lost #2171

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dhilgarth opened this issue Jan 22, 2025 · 1 comment · May be fixed by #2172
Open

High CPU usage after etcd connection is lost #2171

dhilgarth opened this issue Jan 22, 2025 · 1 comment · May be fixed by #2172

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@dhilgarth
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I'm using flannel in Docker Swarm, so together with etcd. #1830 already reported this issue: When flannel loses connectivity to etcd, it will use all CPUs completely and never recover from it.

I've built a version with symbols and profiled the process with perf. This is the result:

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@dhilgarth
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The issue is: the watch channel in both methods is being closed upon connection loss but never re-established. I'm working on a PR

@dhilgarth dhilgarth linked a pull request Jan 23, 2025 that will close this issue
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fix: Fix high CPU usage when losing etcd connection and try to re-est… dhilgarth/flannel
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@dhilgarth