Questions tagged [mongodb-4.2]
The mongodb-4.2 tag has no usage guidance.
18
questions
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1
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15
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MongoDB OplogStart Missing
I understand that some times MongoDB secondary data becomes stale at which point, we need to perform an init sync from the Primary instance.
But sometimes we see error logs that look like this:
2022-...
- 103
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1
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103
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MongoDB aggregation. Trying to use switch in map
Hi im trying to use a switch statement inside of map to increment a value depending on the case but im getting
MongoServerError: $switch found an unknown argument: $$favcast
is this viable?
db....
- 11
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1
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93
views
Mongodb continuous schedule and cancel catchup takeover on replica set member
We have a mongodb 4.2 (stable branch) replica set with three members. It was working for several months without problems. Yesterday one of the secondary members started to do very strange things.
I ...
- 393
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88
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Queries on Mongo Secondary are not equally distributed
I have a MongoDB cluster setup with one primary and 2 Secondaries in a single shard setup. Every night we have a high load but one day and most of the read APIs have a SECONDARY_PREFERRED read ...
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2
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221
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Is there an automatic way for a secondary member to promote to primary member in a replica set?
Here is my setup:
Node 1 = 10.1.0.1 (Primary) - priority 1
Node 2 = 10.1.0.2 (Secondary) - priority 1
Node 3 = 10.1.0.3 (Secondary) - priority 0
In the event of Node 1 failure, Node 2 will be set to ...
- 59
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1
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772
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Rename all databases when doing a mongorestore?
I have a datadump but I need to change the name of every database while restoring them,
if a database is named "customers" it needs to be "customer2", "products" to "...
- 69
1
vote
0
answers
68
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Mongodb Downgrade issue
I have upgraded mongodb to 4.4 from 4.2 in our dev server(RHEL 8). But unable to downgrade it from version 4.4 to 4.2 (Tried after changing package /etc/yum.repos.d/mongodb.repo). Getting error ...
0
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1
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677
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MongoDB Aggregate Poor Index Usage
I've been trying to understand the MongoDB Aggregate process so I can better optimize my queries and I'm confused by usage and $match and $sort together.
Sample DB has only one collection people
[{
...
- 1
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1
answer
38
views
MongoDB replica set and db.stats()
We just added a node to our replica set. After the node's state switched to SECONDARY, I do
use obs
db.stats()
on both the PRIMARY node and the new SECONDARY.
PRIMARY SECONDARY
&...
- 1
2
votes
2
answers
131
views
Failed to start mongo.service on ubuntu 16.04 after update from 4.0 to 4.2
I'm trying to update my MongoDB installation from 3.6 to the latest version [4.4] on Ubuntu16.04 using apt-get. Going from 4.0 to 4.2 I faced a problem during the startup process after updating the ...
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1
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495
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Oplog incremental backup failure
I have scheduled oplog incremental dump using mongodump but it fails very often on majority of the servers. I have a shard cluster with around 200GB of oplog size defined and around 30-40 hours of ...
1
vote
1
answer
382
views
Consequences of increase Oplog to large size
I'm trying to add a new member (m*-server: 4.2.7) in my replica set (m*-servers: 4.2.1),
and it can't sync in time, after the initial sync it changes state to RECOVERING and have: (~ 4.3 - 6.31 hrs) ...
- 31
2
votes
1
answer
8k
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MongoDB - Replication Oplog Window has gone below 1 hours
I'm working with MongoDB Atlas and I have a cluster of 3 with M30 and 100gb of storage.
My current usecase is the following:
- An user dispatches one search in my platform
- The platform dispatches ...
- 63
0
votes
1
answer
30
views
Mongo assigning user permsions issue on docker
I'm using docker image mongo and I extend it to create a user and assign permissions on image build with such a line COPY init.sh /docker-entrypoint-initdb.d/
Here is the init.sh:
#!/bin/bash
set -e;...
- 101
0
votes
1
answer
406
views
Mongo slow startup after upgrade to 4.2.5
I have upgraded the MongoDB replica set, which consists of 3 members, from 4.0.11 to 4.2.5.
After upgrading, startup lasts about 5 minutes.
Before upgrading it was instant.
It is related to ...
- 1
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1
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284
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mongorestore - documents fail validation
The similar question already have been asked: How to validate a mongorestore
But how to actually validate the documents in mongodumb and mongorestore?
And also - can I see the documents that fail ...
- 101
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votes
3
answers
9k
views
Failed to start of service MongoDB community4.2 using Homebrew in Mac OS Mojave 10.14
Error message while starting the mongoDB service.
Error:
Permission denied @ rb_sysopen -
/Users/syedahmed/Library/LaunchAgents/homebrew.mxcl.mongodb-community.plist
I installed/reinstall the ...
0
votes
1
answer
547
views
MongoDB 4.2 using change streams with read concern majority disabled in a PSA deployment
I currently run a PSA (Primary, Secondary, Arbiter) deployment and thous only have two databearing nodes.
In case of a databearing node going down, read concern majority prevented the change stream to ...
