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Block scheduling on the source host of in-use failover host reservations - #1514
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PhilippMatthes
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November 11, 2026 12:10
filter_failover_host removed only the reserved target host, so new VMs could still be scheduled onto a failed host while a gang evacuation was draining it. That works against the drain and keeps the source from ever going empty, so the completion controller could never release the reservation. For non-evacuation requests the filter now also removes the in-use reservation's status.failoverHostReservation.sourceHost. An evacuation's candidates are destinations, never the source, so the evacuation itself is unaffected. Documented in the scheduling-behavior section. Signed-off-by: Philipp Matthes <p.matthes@sap.com>
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Stacked on #1513 (targets
feat/failover-host-completion-controller).filter_failover_hostpreviously removed only a reservation's reserved target host from the candidate set, so new VMs could still be scheduled onto a failed host while a gang evacuation was draining it. That works against the drain and keeps the source host from ever going empty, so the completion controller (#1513) could never see it empty and release the reservation.For non-evacuation requests the filter now also removes the in-use reservation's
status.failoverHostReservation.sourceHost.SourceHostis only set once a reservation isInUse, so this blocks exactly the hosts a gang evacuation is actively draining. An evacuation's own candidates are destinations (never the source), so the evacuation itself is unaffected.Documented in the "How failover host reservations affect scheduling → The filter" section. Covered by a new test case asserting both the reserved target and the in-use source host are pruned.