Questions tagged [mongodb-3.4]

This tag is for MongoDB major version 3.4

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12 views

502 error after restarting mongo db in remote server using fork command

I was trying to upgrade mongo 3.4.20 to 4.0.14 , but it lead to the system crash, so i tried reverting it back to 3.4.20. But after doing db restart using fork , there 502 error. Please help.I tried ...
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1answer
33 views

Is it possible to migrate data from a shard MongoDB to a non-shard MongoDB with dump

Question: I have a shard mongo cluster and I want to migrate data from this cluster to a one node mongo instance. So I want to know is it possible to use dump/restore? I use pymongo and Django ...
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Decision on the shard key in MongoDB 3.4

I have _id column in the following format "date-machineNumber-eventgroup eventid-date-Timestamp-0" Can this key be used as shard key? shard key: { "_id" : 1 } unique: false ...
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1answer
23 views

Why is it necessary to run both mongod and mongo.exe in windows? What's happening behind the scene?

Why is it necessary to run both mongod and mongo.exe in windows? What's happening behind the scene? What's the difference between these two?
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Issue in projecting field using findOneAndUpdate in embedded array Mongoose?

Currently my User model looks like: { _id: 'SomeId' firstName: 'John', lastName: 'Cena', books: [ { _id: 'xyz', title: 'a', author:'b', ratings:[ {source:'source1', ...
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8 views

Can two or more versions of MongoDB run concurrently as Windows services?

I'm working on two .Net projects which use different versions of MongoDB (3.4 and 4.0). By using separate data and log directories (as per this article) I can run both versions concurrently on demand ...
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21 views

Mongodb - AssertionException

Been getting the below exception in huge volume in the logs of mongos. "connection accepted from AssertionException handling request, closing client connection: 17189 The server is configured to only ...
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70 views

Does restarting Mongodb config servers restart the mongos?

Our environment is a 2 node Shard of 5 node replica set with a 3 node replica set config servers and 6 mongos. We happened to change the hostname(short to FQDN) of 1 of the config server and we ...
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13 views

How to add calculated value as a field into an existed array of sub document using MongodB aggregation

I'm working on MongoDB and I have a document like below structure. I am trying to calculate total services cost and each services lane cost. Here services are sub document. My document structure: { ...
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108 views

MongoDB Fails due to permission error even though its setup

Attempting to start my MongoDB server using service mongod start fails for the reason: exception in initAndListen: IllegalOperation: Attempted to create a lock file on a read-only directory: /var/lib/...
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1answer
71 views

Mongo DB content disappear

I have a rails app deployed elsewhere that accesses a Mongo DB running on my local box (at my home). The remote box ip address is the only external address allowed to access the DB. Two nights ago I ...
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1answer
1k views

Why $group is very slow in aggregation and how can faster it in MongoDB [closed]

My query is taking ~3 seconds to execute with the $group stage, How can I faster this? My query is: db.getCollection('employee_data').aggregate([ { $match: //Filter }, { $group: { ...
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2answers
136 views

How to influence files (pre)allocation steps (max growing value) in MongoDB 3.4 with WiredTiger

We have in environment deployed some really small DBs (5GB) as directory per DB.Under dirs is LVM with XFS, where we have implemented logic for "brake" when DB space should be full-filled (all is due ...
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283 views

MongoDB 3.4.10 queries getting very slow after couple hours/days of running

We have a MongoDB pod running on CGP Kubernates with 2 replicas. Microservices are written in Java and use Mophia to access MongoDB. The database only has 6 million data. One collection, in particular,...
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397 views

MongoDB Indexes [getting deleted automatically] | Missing

This problem might look strange. Please bear with me :) It's an application(NodeJS - MongoDB) helping with storing and viewing of LoRa Packets. Background: It's a CentOS 7 on Azure Instance. ...
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1answer
43 views

Mongodb creating historical cluster replicaset

I've a use case which I'm trying to implement.. There is a replicaset(3 nodes) which is primary production cluster, I want to set up a historical cluster another replicaset(3 nodes) which replicates ...
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2answers
1k views

MongoDB - Mongorestore is not working as expected

A Very Good Day, I have the user in the mongodb like below who has the superuser privileges (I confirmed the role setting using show users command) { "_id" : "admin.mongoadmin", "user" : "...
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62 views

MongoDB ticket availability reaching zero

I recently came across intresting issue. I have a sharded cluster which has two replication sets with 2 secondaries. On my primaries, there were 300-400 connections at a point in time, shortly after ...
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82 views

Fetcher stopped querying remote oplog with error: InvalidSyncSource: sync source's last applied OpTime is not greater than our last fetched OpTime

we are having one primary, secondary and arbiter in replica set so we are recieving errors in our secondary instances so what causes the errors and is there any risk factor to our cluster what are ...
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24 views

Mongo Collection Mysteriously unavailable

We are running a mongo on single EC2 instance, we were not able to connect to it , upon debugging we saw CPU usage was spiking , this was the problem we faced previously we then restarted the instance ...
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0answers
53 views

One of the mongo shards consuming too much disk space.

We have mongo cluster with 10 shards of each having 3 replicas. Recently we are facing an issue, exceptionally in a couple of shards, the disk space among all the 3 replicas has reached above 90%. ...
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1answer
190 views

Mongo WriteConflictException in log file

I am experiencing ALOT of this WriteConflictException in my mongo log file, this does not seem to affect the application, because I am not seeing any special errors and everything seems to work fine. ...
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1answer
78 views

Getting exception on running sh.status() command on MongoDB sharded cluster

I am running sh.status() command on my mongos instance of sharded Mongo cluster and I am getting below exception. mongos> sh.status() assert: command failed: { "ok" : 0, "errmsg" : "error ...
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1answer
176 views

Mongodb ReplicaSet Changing Config Format

I have a 3 node mongodb replica set which uses the old syntax (non-Yaml) syntax that I am trying to change to use the new Yaml syntax old syntax auth = true bind_ip = 0.0.0.0 dbpath = /var/lib/...
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1answer
2k views

Not authorized on admin to execute command mongoDB: Atlas M0 Free Tier cluster

My MongoDB shell has version v3.6.5 (the same with older versions) & MongoDB server has version: 3.6.8 I have MongoDB M0 Free Tier cluster and I want to use from shell different commands. So, I ...
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130 views

timeout while dropping database - MongoDB

Getting time out issue while dropping database from mongoDB. Database size is around 200GB. {          "code" : 46,          "ok" : 0,          "errmsg" : "timed out waiting for DBNAME....
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1answer
4k views

MongoDB update multiple sub documents inside array, each according to a condition

I have a document like this: { wid: 1, items: [ {nid: 1, sent: 900}, {nid: 2, sent: 12}, {nid: 3, sent: 0}, {nid: 4, sent: 1} ] } Now consider I want to ...
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1answer
1k views

mongodb setFeatureCompatibilityVersion command not found

I'm trying to upgrade my mongodb from 3.2 to 3.4 and I try to set the compatibility version by: db.adminCommand( { setFeatureCompatibilityVersion: "3.2" } ) But it says { "ok" : 0, ...
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1answer
164 views

MongoDB secondaries become unresponsive during replication

We got 3 Servers running. One Primary, two as secondaries. Primary has 4 vcpus, 16 GB memory, both secondaries have 8 vcpus, 64 GB memory. Every night, we run a full sync with several large ...
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1answer
27 views

Why MongoDB not running SSL?

I need to run MongoDB with SSL, the version that is currently installed is 3.4.16 without SSL. Can I download 3.4.16 with SSL and just stop the service copy the Bin files across and then start up the ...
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0answers
230 views

MongoDB write locks on insert

Why would an insert into a MongoDB 3.4 collection require global write locks? I'm creating a copy of a large collection in a new replica set (via mongodump/restore) and I'm finding that some inserts ...
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0answers
116 views

MongoDb cleanupOrphaned() running for days

My cleanup orphans on a collection is running for 3 days now. Log shows a few million records being deleted once in a while. However, most of the time nothing is deleted. I SHARDING [conn3919] ...
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0answers
26 views

MongoDB 3.4 - Add nodes to Replica Set when only one is available

I originally had a Replica Set comprised of three nodes on different servers. As part of a contingency plan, I tested how long it would take to hot-swap from using a replica set to only using one node,...
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1answer
678 views

Authentication failed on secondary mongodb

I have primary mongodb v3.4.10 on ubuntu (bare metal) with these users: { "_id" : "admin.root", "user" : "root", "db" : "admin", "roles" : [ { "role" : "root", ...
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1answer
2k views

mongodump 3.4.1 error reading collection: Closed explicitly [closed]

[BACKUP COMMAND]: mongodump -u username -p password -d database --port port -o output path. [ISSUE]: error writing data for collection to disk: error reading collection: Closed explicitly. The ...
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2answers
2k views

MongoDB multiple Cluster data sync

Can we have this type of configuration? 1)MongoDB - Multiple cluster data synchronizing master to master 2)MongoDB - Multiple cluster DR 3)MongoDB - Multiple cluster Blue-green deployment
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1answer
1k views

mongodb set feature compatibility to 3.4 fail

I want to enable the features of my Mongodb 3.4 after upgrading. I have sharded cluster enviroment And after I ran the commands: use admin db.adminCommand ({setFeatureCompatibilityVersion: "3.4"}) ...
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2answers
384 views

How to change default mongo port on a bitnami instance

I am running a bitnami instance of mongodb for our pre-production. The default port for mongo is 27017. But for security reasons i want to change it but it is not possible. I have tried these things: ...
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2answers
2k views

Mongodb Standalone Performs better than Replica Set

I am currently using a standalone mongodb with high read operations. Since replica sets could provide high read performance, I setup a 3 node replica set on 3 vms with read preference as "secondary ...
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2answers
956 views

How to find a query that is use deprecated option?

Mongodb writes logs 2018-04-05T11:38:28.178+0000 W COMMAND [conn107] Use of the aggregate command without the 'cursor' option is deprecated. See http://dochub.mongodb.org/core/aggregate-...
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1answer
362 views

how to interact to second database through API on mongodb

I am on Windows environment. I am using Mongoose and nodejs for my project. I have MongoDB Replication i.e 27017(primary), 27018(slave)and 27020 is (Arbitar). now I have One more seperate db named as ...
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1answer
24 views

Embedding JSON in a string

Wondering if I could get some insight on a design I saw recently. A collection can contain a few or tens of thousands of documents. Each document has the same structure of _id and JSONValue. The ...
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2answers
4k views

How to install specific mongo version from the PPA?

Once you've setup the offical mongo PPA, Mongo's docs say that to install a specific version on Ubuntu, to run something like: sudo apt-get install -y mongodb-org=3.6.2 I'd like to install version 3....
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1answer
2k views

How to run mongod from the commandline?

How do you manually run mongod from the commandline, so it outputs all logging directly in your terminal? I'm trying to diagnose a crashing Mongo 3.4.11 database on Ubuntu 16. When I try and start it ...
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2answers
5k views

mongo crashing due to too many open files

I recently upgraded an Ubuntu 14 server, running mongo 3.4.11, to Ubuntu 16. I re-installed the identical version of mongodb-org from their PPA, but now when I start mongo, it's doesn't respond to ...
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1answer
1k views

MongoDB 3.4 Server not starting with bind error following a CentOS 7.4 security update

MongoDB 3.4 server is failing to start following a CentOS security update and reboot. No configuration changes made. The previous update and reboot a couple of days earlier did not cause any ...
2
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1answer
333 views

MongoDb linearizable read concern restrictions

Could someone explain me some part of Mongodb linearizable read concern documentation: Linearizable read concern guarantees only apply if read operations specify a query filter that uniquely ...
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1answer
173 views

Differential and log backup on MongoDB

Is it possible to take differential and log backup on mongodb like on microsoft SQL server?
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0answers
216 views

Quickest way to partially restore a mongodb instance from AWS snapshots?

I have multiple large mongodb clusters running mongodb 3.4 configured with wiredtiger. I would like to set up standalone instances with just a few DBs from these clusters, all on the same EC2 instance....
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1answer
171 views

Error Message while executing command in Arbiter for log rotation

While running the command in the shell db.adminCommand( { logRotate : 1 } ) of arbiter it showing an error message as not authorized to run this command but in primary and secondary of replicaset its ...