Problem Statement/Rationale

What is going wrong? What action would you like the Engineering team to take?

Mongodump (v5.0.6) fails with below error: {"t":\{"$date":"2024-06-25T10:20:25.011-04:00"},"s":"E",  "c":"COMMAND",  "id":4879802, "ctx":"conn2048","msg":"Failed to handle request","attr":{"error":"BSONObjectTooLarge: BSON size limit hit while building Message. Size: 17365895 (0x108FB87); maxSize: 16793600(16MB)"}}

Steps to Reproduce

How could an engineer replicate the issue you’re reporting?

./mongodump  -u<> -p<> --port xxxx --authenticationDatabase admin -o /dump/tmp

Expected Results

What do you expect to happen?

Mongodump fails immediately.

2024-06-25T23:01:02.348-0400    Failed: error creating intents to dump: error getting collections for database `admin`: connection(localhost:27307[-6]) socket was unexpectedly closed: EOF

While mongodb.log throws in the above BSONObjectTooLarge error message.

Actual Results

What do you observe is happening?

Additional Notes

Any additional information that may be useful to include.

User somehow granted permission to write in admin db where it houses ~180,000 colllections as shown below:

PRIMARY> show dbs;
admin     79.389GB
aud        0.000GB
–
--
us         0.000GB
usd        0.000GB
PRIMARY> db.stats();
{
        "db" : "admin",
        "collections" : 180538,  <<<<<< 180k collections in admin db
        "views" : 0,
        "objects" : 99310174,
        "avgObjSize" : 1627.59989601871,
        "dataSize" : 161637228876,
        "storageSize" : 78278610944,
        "indexes" : 180539,
        "indexSize" : 6964662272,