Details
Major - P3 Description
Related to SERVER-4232
If the collection does not live on the primary shard, mongodump won't dump the collection.
mongos> db.system.namespaces.find()
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{ "name" : "test.system.indexes" }
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{ "name" : "test.system.profile", "options" : { "capped" : true, "size" : 1048576 } }
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mongos>
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bye
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$ mongodump --port 27020 -d test -c foo
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connected to: 127.0.0.1:27020
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Thu Nov 7 10:18:10.875 DATABASE: test to dump/test
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$ ls -la dump/test/
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total 0
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drwxr-xr-x 2 joannac staff 68 7 Nov 10:17 .
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drwxr-xr-x 3 joannac staff 102 7 Nov 10:17 ..
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$ mongodump --port 27020 -d test
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connected to: 127.0.0.1:27020
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Thu Nov 7 10:32:52.016 DATABASE: test to dump/test
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Thu Nov 7 10:32:52.017 test.system.indexes to dump/test/system.indexes.bson
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Thu Nov 7 10:32:52.017 0 objects
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Thu Nov 7 10:32:52.017 test.system.profile to dump/test/system.profile.bson
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Thu Nov 7 10:32:52.027 1232 objects
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Thu Nov 7 10:32:52.029 Metadata for test.system.profile to dump/test/system.profile.metadata.json
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mongoexport of the collection works:
$ mongoexport --port 27020 -d test -c foo
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connected to: 127.0.0.1:27020
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{ "_id" : { "$oid" : "5279b9e2972221f9a6cf650b" }, "a" : 1 }
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exported 1 records
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but mongoexport of the system.indexes doesn't
$ mongoexport --port 27020 -d test -c system.indexes
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connected to: 127.0.0.1:27020
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exported 0 records
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This is now more than just a cosmetic problem (SERVER-4232 was just about show collections not showing the collection)