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0148f25fe7
Automatic merge from submit-queue (batch tested with PRs 64597, 67854, 67734, 67917, 67688). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. fix an issue that scheduling doesn't respect NodeLost status of a node **What this PR does / why we need it**: - if Node is in UnknowStatus, apply unreachable taint with NoSchedule effect - some internal data structure refactoring - update unit test **Which issue(s) this PR fixes**: Fixes #67733, and very likely #67536 **Special notes for your reviewer**: See detailed reproducing steps in #67733. **Release note**: ```release-note Apply unreachable taint to a node when it lost network connection. ```