how to modify the osd map

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hello, my cluster have some error two days before ,now some pg in incomplete state, 
e.g , in the current osdmap, the pg 49.6 is map to [35,29,0] , but osd[35,29,0]  are have noany data of pg 49.6, I check the entire cluster, I found in osd.42 have the Complete data of pg
I thing if I can modify the osdmap, set pg 49.6 map to osd.42, the pg maybe can fix,
but I don't know how to modify the osdmap, can you help me ? thank you.

I have use "ceph osd getmap > osdmap.dat" to get the newest osdmap
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