ec pool history objects

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hi, all:

    when I use ec poll, I see there are some object history for object xxxxxx.

[root@node3 2.1d6s2_head]# ll -R | grep xxxxxx
-rw-r--r--. 1 root root  65536 Jun 15 17:41 xxxxxx__head_610951D6__2_fe1_2
-rw-r--r--. 1 root root  65536 Jun 15 17:41 xxxxxx__head_610951D6__2_fe2_2
-rw-r--r--. 1 root root  65536 Jun 15 17:45 xxxxxx__head_610951D6__2_ffffffffffffffff_2

   I think this object is used for roll_back when not all shards have written object to filestore. Is it right?

   If that, why not delete this history objects when all shards has written object to filestore? 

--
Regards,
xinze
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