What is replay_version used for?

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According to the following comment, It seems that only when using btrfs which would make FileStore to do "parallel journaling" will the replay_version be meaningful. Is that right?

		// look at whether any of the osds during this interval survived
		// past the end of the interval (i.e., didn't crash and
		// potentially fail to COMMIT a write that it ACKed).



-------- Forwarding messages --------
From: "xxhdx1985126" <xxhdx1985126@xxxxxxx>
Date: 2016-12-26 16:09:37
To:  "ceph-users@xxxxxxxx" <ceph-users@xxxxxxxx>
Subject: What is replay_version used for?



Hi, everyone.


What is Objecter::Op::replay_version used for?


Thanks:-)
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