crush problem in EC environment

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hi cephers:
    recently,we found some pgs incomplete in our bluestore+ec
overwrite environment, we think it
is because the pg's acting set size below the min_size when some osd
failure out. we wonder know how to reslove the crush problem in EC
environment. thanks!

PG_STAT OBJECTS MISSING_ON_PRIMARY DEGRADED MISPLACED UNFOUND BYTES
LOG  DISK_LOG STATE      STATE_STAMP                VERSION   REPORTED
UP                      UP_PRIMARY ACTING
ACTING_PRIMARY LAST_SCRUB SCRUB_STAMP                LAST_DEEP_SCRUB
DEEP_SCRUB_STAMP
4.4c          0                  0        0         0       0     0
0        0 incomplete 2017-05-10 15:51:16.592083       0'0    966:3
[2147483647,6,8,2147483647,1,9]          5
[2147483647,6,8,2147483647,1,9]              5   829'6744 2017-05-10
04:50:07.114874        725'4190 2017-05-06 05:47:25.286826
4.67          0                  0        0         0       0     0
3000     3000 incomplete 2017-05-10 15:51:16.512486  831'5439    966:4
 [6,2147483647,2147483647,5,8,4]          6
[6,2147483647,2147483647,5,8,4]              6   825'5292 2017-05-09
16:53:26.029346        696'5082 2017-05-04 00:28:50.459986

regards!
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