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Questions tagged [mongodb-3.4]

This tag is for MongoDB major version 3.4

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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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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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1answer
37 views

MongoDB 3.6, adding replica set always fails as on production setup with cannot open /dev/urandom Too many open files

I am trying on add a 3.6 mongoDB node to a 3 member replica set running 3.4. Doing this as a part of DB upgrade from 3.4 to 3.6. When I add the new member to replica set, it goes to STARTUP2, data ...
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21 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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17 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
53 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
27 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
30 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
366 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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0answers
49 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
464 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
289 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
41 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
19 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
97 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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83 views

MongoImport stuck in loop?

This question is for anyone that knows mongoimport. I have mongo v3.4.9 locally, as well as Robo3T. Using Robo3T I can check the status of my database user (db=admin, collection=system.users) and can ...
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0answers
53 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
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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
351 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
888 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
851 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
298 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
218 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
642 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
345 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
166 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
22 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
2k 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
1k 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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1answer
2k 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
640 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 ...
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1answer
224 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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392 views

mongoimport performance

I'm working with a mongodb 3.4.10 and need to process several million documents daily. Using mongoimport I am achieving insert rate of around 40,000/sec. If i then try to reprocess the file and add -...
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1answer
119 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
166 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
98 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 ...
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2answers
820 views

What is the behavior of null/empty value in compound shard key?

I have a shard key based on {Field1:1,Field2:1} where Field2 can be null. So if two documents have same value for Field1 and null/empty value of Field2 then are they considered to belong to the ...
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1answer
422 views

Mongodb: Determining shard key strategy on compound index

I have a collection with 170 millions+ documents and it is only going to increase. The size of the collection is not that huge, currently around 70 GB. The collection has two fields indexed on: {...
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2answers
3k views

how to set Mongod config set multiple bindIp addresses

I have the following config file: net: bindIp: 127.0.0.1 port: 27017 storage: dbPath: c:\mongoDATA\db journal: enabled: true ##systemLog: ## destination: file ## path: C:\mongoDATA\...
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0answers
103 views

MongoDB not performing well when set Read from secondary

I have a mongoDB database, with 1 primary and 1 secondary in replicaset(and 1 arbiter). Both the servers are hosted on aws on c4.2xlarge instances(with 1.5 TB of SSD on each). Mongo version of primary ...
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225 views

MongoDB 64 on Raspberry Pi 3 with SLES 12 64 bit

I am trying to run MongoDB 3.4 on raspberry pi 3 with an OS which was made by SUSE and SUSE is the only official 64 bit OS for raspberry pi (SLES 12 SP2). I have downloaded the MongoDB from the link ...
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1answer
2k views

Multiple BindIp in MongoDB 3.4.1 on Debian Jessie

I just upgraded from MongoDB 3.2 to 3.4.1. /etc/mongod.conf had a multiple BindIP: bindIp: [127.0.0.1,192.168.20.1] This is not working anymore. I get this error : Scalar option 'net.bindIp' must ...
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1answer
139 views

Issue with MongoDB Replication Set

I have 3 "CentOs 7" VM's in AWS environment in which I have setup MongoDB Repication Set using below command. mongod --fork --logpath "/var/rs1/1.log" --replSet yogi --dbpath "/var/rs1/" --port 27017 ...
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1answer
355 views

What's the difference between DISTINCT_SCAN and IXSCAN in explain output?

In Mongo 3.4 explain("executionStats").distinct(...), for some queries the winning plan contains an IXSCAN step, and for other queries it contains an DISTINCT_SCAN step. What is the difference ...
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1answer
18 views

Mongodb: how to move a member to a backup site?

It is stated in the docs, that any replica set should have an odd number of members. Let's say I have a primary site with 3 members. I need to move one member to a backup site. In order to do this, do ...
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1answer
3k views

MongoDB Shutting down. Signal 15

Using MongoDB in a live server. Everyday in the morning, I find that mongod process is shutdown. The mongodb log is as follows: 2017-11-02T11:19:49.173+0000 I FTDC [initandlisten] Initializing ...
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2answers
318 views

mongodb sharded cluster configured but not working

I have configured a sharded cluster on aws on a replicaSet composed on two server, a config server and a front server and mongo 3.4. I followed mainly this tutorial : The configuration seems correct....
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506 views

MongoDB collection.count() return 0 after restore

I have restored a 1.74G data into my MongoDB 3.4.4. The mongorestore command returns successfully. But when I run the count on the collection I always got 0. Below is the output: mongos> db.orders....
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2answers
333 views

Shards error msg “can't use localhost … either use localhost or ipadresses”

I'm trying to set up a a test environment on my pc including sharding. I've added 2 shardservers, a configsvr and a router instance. When i'm trying to add a shard I get following errormsg: "Can't use ...
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261 views

Mongodb 3.4 keyFile Not working

I am newbee in mongodb. I am trying to create replica set with authentication. I have followed the official guide documentation but stuck after adding the keyFile: Path to config file. After adding ...