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It is confirmed in PMR 39339,7TD,000 that resource limit set at parent level in hybrid sharing model could be breached and this is not avoidable due to unpredictable workload pattern, e.g two sub-consumers are over-allocated but within parent limit, later a third consumer owning large number of slots will get slots allocated with its new demand. And under this case, limit set at parent level will be breached.
This is ok if it happens for a short interval. But if the over-slotted consumer sets a large grace period, say 24 hours or even longer, ego will wait until grace period expires to get back these slots. During this time, the parent limit is breached and some other consumers will starve even they own slots.
This is not fair and symphony should at least expose some parameters to allow changing this behavior.
One suggestion is to provide parameters to change this reclaim behavior, i.e. keep current default behavior of reclaiming over-allocated slots in (reclaim_timeout + 2 minutes), but allow user to set parameter, say EGO_HYBRID_ENFORCE_PARENT_LIMIT=true (can default to false), to flag that EGO should forcefully reclaim back these over-allocated slots in min(EGO_HYBRID_RECLAIM_TIME,reclaim_timeout)+2 minutes. As these are over-allocated slots rather than owned slots, EGO should be able to force reclaim back slots upon this flag set to true. Of course, these parameters should not affect reclaiming slots by ownership rather it should be for borrowed/over-allocated slots only.
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Advanced sharing policy including consumer level exclusive and MDS have been added to Symphony since 7.2.x release.
This RFE's Headline was changed after submission to reflect the headline of an internal request we were already considering, but will now track here.
Creating a new RFE based on Community RFE #71627 in product Platform Symphony.