On Sun, Dec 2, 2018 at 7:37 PM 韦皓诚 <whc0000001@xxxxxxxxx> wrote: > > 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? While there may be limited cases where it can be useful, there are a lot of caveats and surprising holes where this doesn't work right or can cause issues. (Because it reads from replicas — which don't have the full PG state a primary does — there are numerous situations where you can retrieve stale or incorrect data.) I would strongly advise against using it. -Greg
