question about backfill on erasure pool

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hi,all
i have a question about pg backfill on erasure pool.
pg0 in erasure pool, which k:m=2:1,
at first, pg0 on osd [1,2,3], after osd.4 added,
the pg0 is now distribute to osd [1,2,4],
for replicated pool, it will do backfill from primary(osd.1) to osd.4,
for erasure code pool, the primary osd.1 needs to read the data chunks
from osd.1 and osd.2,
then decode and push the parity chunk to osd.4,
in the above case, the osd.3 is up and contain the parity chunk,
why dont let osd.3 push the parity chunk to osd.4?
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