Cannot see which database data is missing from

[mnikolic-ep]

I am trying out migration-verifier to validate a "zero-downtime" mongo migration. The only thing I care about is that there are no documents in the source database missing from the destination database.

Is this possible with migration-verifier?

This is the command I am running:

migration_verifier   \
  --srcURI "mongodb://localhost:27017"   \
  --dstURI "mongodb://localhost:27018"   \
  --metaURI "mongodb://localhost:27018"   \
  --srcNamespace databasename.collectionname   \
  --dstNamespace databasename.collectionname   \
  --checkOnly

And these are the results I get:

End of Generation #1

Generation time elapsed: 15.26s

Namespaces compared: 1
Source documents compared: 1 (0.07/sec)
Total size of those documents: 290 bytes (18.95 bytes/sec)

Failure summary:
+--------------------------------+-------+
|          FAILURE TYPE          | COUNT |
+--------------------------------+-------+
| Documents With Differing       |     0 |
| Content                        |       |
| Documents Missing On Source or |   472 |
| Dest                           |       |
+--------------------------------+-------+

First 20 documents present in source/destination missing in destination/source:

Ideally I'd like to see something like the following:

+--------------------------------+-------+
|          FAILURE TYPE          | COUNT |
+--------------------------------+-------+
| Documents With Differing       |     0 |
| Content                        |       |
| Documents Missing On Source    |   472 |
| Documents Missing On Dest      |     2 |
+--------------------------------+-------+