push SystemMetadata entries from the CN that has them all to the shared map where other nodes may not have all entries. The CN with the complete copy only pushes SM entries that it does not own and that return as null because those are the ones that are missing on the other, non-complete CNs. This is different from the previous approach where a stale CN tried to PULL it's missing entries from the shared map. Because of HZ key ownership, there is no guarantee that a stale node will have SystemMetadata DB records for all the pids it "owns"
push SystemMetadata entries from the CN that has them all to the shared map where other nodes may not have all entries. The CN with the complete copy only pushes SM entries that it does not own and that return as null because those are the ones that are missing on the other, non-complete CNs.
This is different from the previous approach where a stale CN tried to PULL it's missing entries from the shared map. Because of HZ key ownership, there is no guarantee that a stale node will have SystemMetadata DB records for all the pids it "owns"