Feature #3857: mds: enforce unique mds names in mdsmap - CephFS - Ceph

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Feature #3857

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mds: enforce unique mds names in mdsmap

Added by Sage Weil over 11 years ago. Updated about 11 years ago.

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Resolved

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Normal

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Description

Currently mds's are uniquely identified by their addr (i.e., a unique instance of the process). The name is useful only as a convenient identifier.

Instead, (optionally) enforce that mds's in the mdsmap have unique names. When an mds boots/joins, any previous mds with the same name is failed and booted.

This makes the names a bit less confusing. It also means that if you restart a daemon, it immediately takes over for its previous instantiation without having to wait for the beacon to time out.

OTOH, if there are two mds's with the same name due to a misconfiguration, they will fight each other.