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Type:
Task
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Resolution: Unresolved
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Priority:
Minor - P4
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None
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Affects Version/s: None
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Component/s: None
When running mongodump with --oplog on a standalone mongod :
mongodump --out /data/dump.27017 --oplog --port 27017
the error returned is:
Failed: error getting oplog start: not found
which comes from this section of the code.
However, I believe the error in this line would have been more informative as in:
return fmt.Errorf("error finding oplog: %v", err)
Furthermore, looking at the verbose output of this command, I see that when it doesn't find a replica set, it assumes master/slave configuration and further assuming that it has the local.oplog.$main collection which should not have been the case with a standalone node.
$ mongodump -vvvvvv --out /data/dump.27017 --oplog --port 27017 2016-09-26T13:11:22.323+0530 found databases: local, test 2016-09-26T13:11:22.324+0530 enqueued collection 'test.coll' 2016-09-26T13:11:22.324+0530 not connected to a replica set, assuming master/slave 2016-09-26T13:11:22.324+0530 oplog located in local.oplog.$main 2016-09-26T13:11:22.324+0530 dump phase I: metadata, indexes, users, roles, version 2016-09-26T13:11:22.324+0530 reading indexes for `test.coll` 2016-09-26T13:11:22.324+0530 not connected to a replica set, assuming master/slave 2016-09-26T13:11:22.324+0530 oplog located in local.oplog.$main 2016-09-26T13:11:22.324+0530 getting most recent oplog timestamp 2016-09-26T13:11:22.324+0530 Failed: error getting oplog start: not found
PS: This doesn't create any problem except users not being referred to the exact error.