DB testing failed, pls advise

so i’m a long time MSSQL->MYSQL user.
I am preparing my brain and environment for migrating to mongodb.
I put a bit of stress test and now i cant figure out how to recover from that.

1.I put a script with fake name generator to fill the mounted disk with mongodb data.
2.When i woke up, it was obviously filled (5GB) with 60+ mil documents.
It was not starting,so i mounted another drive 8GB, i rsync mongodb to 8GB drive
and now its starts
3.The problem is that in mongodb compas it was showing 0 - 20 of N/A
Atleast i seen the data
4.after mongodb -repair
0 - 0 of N/A
I don’t see any data.

Please advise what is the best practice to recover from this.

Thank you

when i run repair

{"t":{"$date":"2021-04-08T09:45:43.547+02:00"},"s":"I",  "c":"CONTROL",  "id":23285,   "ctx":"main","msg":"Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'"}
{"t":{"$date":"2021-04-08T09:45:43.551+02:00"},"s":"W",  "c":"ASIO",     "id":22601,   "ctx":"main","msg":"No TransportLayer configured during NetworkInterface startup"}
{"t":{"$date":"2021-04-08T09:45:43.552+02:00"},"s":"I",  "c":"NETWORK",  "id":4648601, "ctx":"main","msg":"Implicit TCP FastOpen unavailable. If TCP FastOpen is required, set tcpFastOpenServer, tcpFastOpenClient, and tcpFastOpenQueueSize."}
{"t":{"$date":"2021-04-08T09:45:43.552+02:00"},"s":"I",  "c":"STORAGE",  "id":4615611, "ctx":"initandlisten","msg":"MongoDB starting","attr":{"pid":3408,"port":27017,"dbPath":"/media/ukro/data2/mongodb/","architecture":"64-bit","host":"work3"}}
{"t":{"$date":"2021-04-08T09:45:43.552+02:00"},"s":"I",  "c":"CONTROL",  "id":23403,   "ctx":"initandlisten","msg":"Build Info","attr":{"buildInfo":{"version":"4.4.4","gitVersion":"8db30a63db1a9d84bdcad0c83369623f708e0397","openSSLVersion":"OpenSSL 1.1.1d  10 Sep 2019","modules":[],"allocator":"tcmalloc","environment":{"distmod":"debian10","distarch":"x86_64","target_arch":"x86_64"}}}}
{"t":{"$date":"2021-04-08T09:45:43.552+02:00"},"s":"I",  "c":"CONTROL",  "id":51765,   "ctx":"initandlisten","msg":"Operating System","attr":{"os":{"name":"LinuxMint","version":"4"}}}
{"t":{"$date":"2021-04-08T09:45:43.552+02:00"},"s":"I",  "c":"CONTROL",  "id":21951,   "ctx":"initandlisten","msg":"Options set by command line","attr":{"options":{"storage":{"dbPath":"/media/ukro/data2/mongodb/"}}}}
{"t":{"$date":"2021-04-08T09:45:43.552+02:00"},"s":"E",  "c":"STORAGE",  "id":20568,   "ctx":"initandlisten","msg":"Error setting up listener","attr":{"error":{"code":9001,"codeName":"SocketException","errmsg":"Address already in use"}}}
{"t":{"$date":"2021-04-08T09:45:43.552+02:00"},"s":"I",  "c":"REPL",     "id":4784900, "ctx":"initandlisten","msg":"Stepping down the ReplicationCoordinator for shutdown","attr":{"waitTimeMillis":10000}}
{"t":{"$date":"2021-04-08T09:45:43.553+02:00"},"s":"I",  "c":"COMMAND",  "id":4784901, "ctx":"initandlisten","msg":"Shutting down the MirrorMaestro"}
{"t":{"$date":"2021-04-08T09:45:43.553+02:00"},"s":"I",  "c":"SHARDING", "id":4784902, "ctx":"initandlisten","msg":"Shutting down the WaitForMajorityService"}
{"t":{"$date":"2021-04-08T09:45:43.553+02:00"},"s":"I",  "c":"NETWORK",  "id":4784905, "ctx":"initandlisten","msg":"Shutting down the global connection pool"}
{"t":{"$date":"2021-04-08T09:45:43.553+02:00"},"s":"I",  "c":"NETWORK",  "id":4784918, "ctx":"initandlisten","msg":"Shutting down the ReplicaSetMonitor"}
{"t":{"$date":"2021-04-08T09:45:43.553+02:00"},"s":"I",  "c":"SHARDING", "id":4784921, "ctx":"initandlisten","msg":"Shutting down the MigrationUtilExecutor"}
{"t":{"$date":"2021-04-08T09:45:43.553+02:00"},"s":"I",  "c":"CONTROL",  "id":4784925, "ctx":"initandlisten","msg":"Shutting down free monitoring"}
{"t":{"$date":"2021-04-08T09:45:43.553+02:00"},"s":"I",  "c":"STORAGE",  "id":4784927, "ctx":"initandlisten","msg":"Shutting down the HealthLog"}
{"t":{"$date":"2021-04-08T09:45:43.553+02:00"},"s":"I",  "c":"STORAGE",  "id":4784929, "ctx":"initandlisten","msg":"Acquiring the global lock for shutdown"}
{"t":{"$date":"2021-04-08T09:45:43.553+02:00"},"s":"I",  "c":"-",        "id":4784931, "ctx":"initandlisten","msg":"Dropping the scope cache for shutdown"}
{"t":{"$date":"2021-04-08T09:45:43.553+02:00"},"s":"I",  "c":"FTDC",     "id":4784926, "ctx":"initandlisten","msg":"Shutting down full-time data capture"}
{"t":{"$date":"2021-04-08T09:45:43.553+02:00"},"s":"I",  "c":"CONTROL",  "id":20565,   "ctx":"initandlisten","msg":"Now exiting"}
{"t":{"$date":"2021-04-08T09:45:43.553+02:00"},"s":"I",  "c":"CONTROL",  "id":23138,   "ctx":"initandlisten","msg":"Shutting down","attr":{"exitCode":48}}

mongodb log

{"t":{"$date":"2021-04-08T09:44:08.840+02:00"},"s":"W",  "c":"COMMAND",  "id":20525,   "ctx":"conn11","msg":"Failed to gather storage statistics for slow operation","attr":{"opId":8415,"error":"lock acquire timeout"}}
{"t":{"$date":"2021-04-08T09:44:08.840+02:00"},"s":"I",  "c":"COMMAND",  "id":51803,   "ctx":"conn11","msg":"Slow query","attr":{"type":"command","ns":"db.col1","appName":"MongoDB Compass","command":{"aggregate":"col1","pipeline":[{"$match":{"maxTimeMS":1111111}},{"$skip":0},{"$group":{"_id":1,"n":{"$sum":1}}}],"cursor":{},"maxTimeMS":5000,"lsid":{"id":{"$uuid":"497f25d5-1ef9-429d-bad7-f344cbb5bb6b"}},"$db":"db"},"planSummary":"COLLSCAN","numYields":5626,"queryHash":"37ECF029","planCacheKey":"37ECF029","ok":0,"errMsg":"Error in $cursor stage :: caused by :: operation exceeded time limit","errName":"MaxTimeMSExpired","errCode":50,"reslen":160,"locks":{"ReplicationStateTransition":{"acquireCount":{"w":5628}},"Global":{"acquireCount":{"r":5628}},"Database":{"acquireCount":{"r":5628}},"Collection":{"acquireCount":{"r":5628}},"Mutex":{"acquireCount":{"r":2}}},"protocol":"op_msg","durationMillis":5010}}

Hi @Ukro_Ukrovic,

It looks like you run the repair while the instance was running which is not how the repair works.

Why did you need to repair the dbPath if you can resync it. Resync is the best option to repair a failed node files…

Compass cannot calculate all data so its better to use a shell connection and run a count on the documents and se that the value is the expected one. Additionally you can run a validate command on the collection to verify its integrity…

Best regards,

thank for your reply
Sorry for that, had no idea that repair would not do what ever is neccesary to process the repair (automaticaly stop instance and run again)
In robo3t it is showing the correct numbers, but i need to see it in pure GUI etc compass.
Will try to find the validate command and verify command.

btw repair:

{"t":{"$date":"2021-04-08T10:08:11.297+02:00"},"s":"I",  "c":"INDEX",    "id":20306,   "ctx":"initandlisten","msg":"Validation complete for collection. No corruption found","attr":{"namespace":"admin.system.version","uuid":" (UUID: 8793bae9-ab3c-4baa-bd8b-456411f9361e)"}}

Hi @Ukro_Ukrovic,

The log line looks good so I expect data is consistent.

You can use a shell connection from Compass when clicking the bar on the lower side.

Additionally, you can just count all documents with aggregation tab:

Best regards,

As i said, i understand that i can count it, but i need the pure view of DB for debug/fixing purposes.


    "ns" : "db.col1",
    "nInvalidDocuments" : 0,
    "nrecords" : 66207905,
    "nIndexes" : 1,
    "keysPerIndex" : {
        "_id_" : 66207905
    "indexDetails" : {
        "_id_" : {
            "valid" : true
    "valid" : true,
    "warnings" : [],
    "errors" : [],
    "extraIndexEntries" : [],
    "missingIndexEntries" : [],
    "ok" : 1.0


Any other ideas? :> :stuck_out_tongue:

The header says it has 66M documents .

The UI seems to not load yet so I am not sure the “No Rows” should be taken seriously when the query still running.

Can you run in mongo shell beta:

use db;


Error: Line 1: Unexpected identifier

I run it from robo3t

From compas:

{ _id: ObjectId("606e1b562d18931239ee1860"),
  name: 'Kevin',
  surname: 'Walker',
  job: 'Lobbyist',
  country: 'Moldova' }

So you are thinking that the compas gui gave up after some timeout?

Ok so i figured it out.
The problem was between chair and keyboard.
When i was testing find, after that i removed it from textbox, but didn’t press find to clear the memory i guess.
So whenever i press refresh it was refreshing from the saved memory even if textbox has empty string.
When i pressed find and then refresh, all see ok
Still with

1 - 20 of N/A

But its fine, atleast i see all stuff.
Thank you for your time.

P.S. i want to add that i love mongodb and so looking forward to change all of our apps to mongo :heart:

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Thanks for the worm words!

We love you being part of the community , keep up the good work migrating to the best database there is ;p

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