How to use the feature of "CEPH_OSD_FALG_BALANCE_READS" ?

[韦皓诚 <whc0000001@xxxxxxxxx>]

Hi~
    I want to turn on the "CEPH_OSD_FALG_BALANCE_READS" flag to
optimize read performance.  Do I just need to set flag in librados API
and is there any other problems?
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