Why newly added OSD need to get all historical OSDMAPs in pre-boot

[Xiaoxi Chen <superdebuger@xxxxxxxxx>]

Hi List,

     We see newly added OSD take long time to become active,  it is
fetching old osdmaps from monitors. Curious why it need that much
historical ?  The cluster is stable , no osd down/out except the ongoing
cap add (one osd at a time).


{
    "cluster_fsid": "e959f744-64be-4f4e-9606-103ccaa9d2d6",
    "osd_fsid": "0a2d4b9d-f6e5-4e40-be7f-16daee131a20",
    "whoami": 38,
    "state": "preboot",
    "oldest_map": 193222,
    "newest_map": 298982,
    "num_pgs": 0
}

root@host:~# ceph osd getmap | head -5
got osdmap epoch 324825


-Xiaoxi
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