Details
Major - P3 Description
With mongodump-2.4, this works:
$ mongodump-2.4 -d "admin" -c "system.users"
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connected to: 127.0.0.1
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Tue Feb 25 13:53:12.167 DATABASE: admin to dump/admin
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Tue Feb 25 13:53:12.167 admin.system.users to dump/admin/system.users.bson
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Tue Feb 25 13:53:12.168 1 objects
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Tue Feb 25 13:53:12.168 Metadata for admin.system.users to dump/admin/system.users.metadata.json
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$
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but doing the same thing, against the same db, with 2.6rc0 mongodump writes no output file:
$ mongodump-2.6 -d "admin" -c "system.users"
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connected to: 127.0.0.1
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2014-02-25T13:54:36.635-0500 DATABASE: admin to dump/admin
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$
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however, it looks like other collections (system.roles, system.version, etc) do get dumped as expected.
We need to be able to dump system.users in order to complete the multi-tenant user dump/restore process outlined in Matt's comment on QA-404: