Major - P3 Start a one shard cluster and run mongodump -repair. The error is that the repairCursor does not exist on mongos, but the error message says that -repair cannot be used on mongo version before 2.7.8.
The repairCursor is not implemented for mongos (which is OK), but it should return a helpful error message saying so.
dan:(git)mongo-tools[master]/$ ./bin/mongodump --repair -d test --port 30999 2014-11-18T01:36:14.468-0500 writing repair of test.system.indexes to dump/test/system.indexes.bson ==> 2014-11-18T01:36:14.468-0500 error reading from db: no such cmd: repairCursor ==> 2014-11-18T01:36:14.468-0500 error: --repair flag cannot be used on mongodb versions before 2.7.8.