Backup juju with/without interrupting juju

[William Reade]

On Thu, Jun 5, 2014 at 7:32 PM, Nate Finch <nate.finch at canonical.com> wrote:

> I guess what I don't understand is, why does it matter which mongo DB you
> back up?  They should all be identical, right?
>

Replication lag is a real thing, and shouldn't be discounted. We want to be
sure that the backup corresponds to a point in time no earlier than the
user issued the backup command, and I think the right way to do that is
`mongodump --oplog` on the primary; which, conveniently, doesn't involve
taking the db down.

Cheers
William
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