MongoDB mongorestore Assertion failure b.empty error

I encountered this error after trying to restore 2.1 mongodumps. (This happened only after installing mongodb 2.2.0):

The Error:

Wed Sep 19 18:33:26 Assertion failure b.empty() src/mongo/db/json.cpp 645
0x10036b5fb 0x10009ad86 0x1004af6f2 0x100016f85 0x100016944 0x100016944 0x100019e54 0x100313b5d 0x100315697 0x10000126a 0x1000011e4 
 0 mongorestore 0x000000010036b5fb _ZN5mongo15printStackTraceERSo + 43
 1 mongorestore 0x000000010009ad86 _ZN5mongo12verifyFailedEPKcS1_j + 310
 2 mongorestore 0x00000001004af6f2 _ZN5mongo8fromjsonEPKcPi + 1634
 3 mongorestore 0x0000000100016f85 _ZN7Restore9drillDownEN5boost11filesystem210basic_pathISsNS1_11path_traitsEEEbbb + 4117
 4 mongorestore 0x0000000100016944 _ZN7Restore9drillDownEN5boost11filesystem210basic_pathISsNS1_11path_traitsEEEbbb + 2516
 5 mongorestore 0x0000000100016944 _ZN7Restore9drillDownEN5boost11filesystem210basic_pathISsNS1_11path_traitsEEEbbb + 2516
 6 mongorestore 0x0000000100019e54 _ZN7Restore5doRunEv + 3140
 7 mongorestore 0x0000000100313b5d _ZN5mongo8BSONTool3runEv + 1325
 8 mongorestore 0x0000000100315697 _ZN5mongo4Tool4mainEiPPc + 5447
 9 mongorestore 0x000000010000126a main + 58
 10 mongorestore 0x00000001000011e4 start + 52

The Cause:

The offending file is the <dump directory/<database>/<collection>.metadata.json file.  It has a line like so:

{options : { "create" : <database>, undefined, undefined, undefined }, indexes:[{ "v" : 1, "key" : { "_id" : 1 }, "ns" :<database>, "name" : "_id_" }]}

The “undefined,undefined,…” is an artifact from 2.1 beta.

The Cure:

Delete the “, undefined, undefined, undefined” and save the json metadata file and rerun the mongorestore.

You might have to do this for a few databases. You can see which data base by looking at the line before the error message like so:

Wed Sep 19 18:33:26 <dump directory>/<database>/<collection>.bson 
Wed Sep 19 18:33:26 going into namespace [<database>.<collection>] 
Wed Sep 19 18:33:26 Assertion failure b.empty() src/mongo/db/json.cpp 645

Cheers

<k/>

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