'lctl abort_recovery' doesn't abort recovery between MDTs, because unlike abort recovery on single MDT system which only fail unfinished operations, this may break system consistency, so as a tradeoff, Lustre chose consistency over availability. But there are two major causes if recovery between MDTs doesn't finish, the first is network issue, for this type, we can wait indefinitely for network to recover, while the second is software bug, which is difficult for user to fix manually on backend filesystem.

Now lfsck is ready, which can fix inconsistency in the system. So we should provide an option to allow user to abort recovery between MDTs, and then fix inconsistencies.