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Backport #16550

Updated by Nathan Cutler over 7 years ago

https://github.com/ceph/ceph/pull/10038
we are using cluster.mon_command() in rados.py to do with *perfix*="osd pool stats",format="json", monitor will assert

Recheck the code we wrongly make "prefix" to "perfix" :( , and anything other than "prefix"(say "abc") will kill the monitor.

This is dangerous as anyone has access to the rados can take down whole cluster.

[Bug seem in hammer 0.94.6, not tested against other version

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