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Bug #2188
closedmon: mds rm should be harder to break things with
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Description
If you run ceph mds rm 0 on a healthy cluster, it breaks the Monitor's world. I'm uncomfortable with the command existing, but don't want to remove it on my own.
Still, if it stays, it should have:
1) A yes-i-really-mean-it guard
2) Some method of dealing with actually removing a live MDS. Returning an error if it's up? Pulling it out of the up set and mds_info (I think that might force it to shut down, though it leaves the logical around)?
3) Some documentation.
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