pg wait too long when osd restart

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Hi all,
osd_heartbeat_grace = 20 and osd_pool_default_read_lease_ratio = 0.8 by
default, so, pg will wait 16s when osd restart in the worst case. This wait
time is too long, client i/o can not be unacceptable. I think adjusting
the osd_pool_default_read_lease_ratio to lower is a good way. Have any good
suggestions about reduce pg wait time?

Best Regard
Yite Gu
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