Reduce memory usage by OSDs during peering

Updated -

Memory usage is linear to the number of placement groups (PGs) hosted on the particular object storage device (OSD), but another factor can consume memory during peering- the number of OSD maps needed to go through during peering. In some situations, such as an OSD is out for a long period of time, peering as the OSD maps are iterated can consume large amounts of memory and result in poor perf...

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