Node.js server crashes , Database operations halfway?

Posted by Ranadeep on Server Fault See other posts from Server Fault or by Ranadeep
Published on 2013-10-20T08:44:36Z Indexed on 2013/10/20 9:56 UTC
Read the original article Hit count: 402

Filed under:

mongodb

|

node.js

|

production-environment

|

server-crashes

I have a node.js app with mongodb backend going to production in a week and i have few doubts on how to handle app crashes and restart .

Say i have a simple route /followUser in which i have 2 database operations

/followUser
----->Update User1 Document.followers = User2
----->Update User2 Document.followers = User1
----->Some other mongodb(via mongoose)operation

What happens if there is a server crash(due to power failure or maybe the remote mongodb server is down ) like this scenario :

----->Update User1 Document.followers = User2
 SERVER CRASHED , FOREVER RESTARTS NODE

What happens to these operations below ? The system is now in inconsistent state and i may have error everytime i ask for User2 followers

----->Update User2 Document.followers = User1
----->Some other mongodb(via mongoose)operation

Also please recommend good logging and restart/monitor modules for apps running in linux

© Server Fault or respective owner

Related posts about mongodb

MongoDB usage best practices

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
The project I'm working on uses MongoDB for some stuff so I'm creating some documents to help developers speedup the learning curve and also avoid mistakes and help them write clean & reliable code. This is my first version of it, so I'm pretty sure I will be adding more stuff to it, so stay tuned… >>> More
Errors trying to run MongoDB

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I'm running Ubuntu Server 12.04 (32 bit) on an old (1998) computer. Everything's working fine until I try and start MongoDB. somekittens@DLserver01:~$ mongo MongoDB shell version: 2.2.2 connecting to: test Sun Dec 16 22:47:50 Error: couldn't connect to server 127.0.0.1:27017 src/mongo/shell/mongo… >>> More
push new value to mongodb inner array - mongodb/php

as seen on Stack Overflow - Search for 'Stack Overflow'
hi i have this document in mongo: { "_id": ObjectId("4d0b9c7a8b012fe287547157"), "done_by": ["1"] } and i want to add another value to "done_by" field, so my expected document will be:: { "_id": ObjectId("4d0b9c7a8b012fe287547157"), "done_by": ["1","2","3"] } i try this: $conn… >>> More
Write-only collections in MongoDB

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm currently using MongoDB to record application logs, and while I'm quite happy with both the performance and with being able to dump arbitrary structured data into log records, I'm troubled by the mutability of log records once stored. In a traditional database, I would structure the grants for… >>> More
How to install mongoDB on windows?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi! I am trying to test out mongoDB and see if it is anything for me. I downloaded the 32bit windows version, but have no idea on how to continue from now on. I normally use the WAMP services for developing on my local computer. Can i run mongoDB on Wamp? However, what's the best (easiest!) way… >>> More

Related posts about node.js

Node.js Adventure - Node.js on Windows

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
Two weeks ago I had had a talk with Wang Tao, a C# MVP in China who is currently running his startup company and product named worktile. He asked me to figure out a synchronization solution which helps his product in the future. And he preferred me implementing the service in Node.js, since his worktile… >>> More
Node.js Adventure - Host Node.js on Windows Azure Worker Role

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
In my previous post I demonstrated about how to develop and deploy a Node.js application on Windows Azure Web Site (a.k.a. WAWS). WAWS is a new feature in Windows Azure platform. Since it’s low-cost, and it provides IIS and IISNode components so that we can host our Node.js application though Git… >>> More
Sending data through POST request from a node.js server to a node.js server

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to send data through a POST request from a node.js server to another node.js server. What I do in the "client" node.js is the following: var options = { host: 'my.url', port: 80, path: '/login', method: 'POST' }; var req = http.request(options, function(res){ console… >>> More
node.js on multi-core machines

as seen on Stack Overflow - Search for 'Stack Overflow'
node.js looks interesting BUT... I must miss something - isn't node.js tuned only to run on a single process & thread? Then how does it scale for multi-core CPUs and multi-CPU servers? After all, it is all great to make fast as possible single-thread server, but for high loads I would want to… >>> More
Node.js as a custom (streaming) upload handler for Django

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to build an upload-centric app using Django. One way to do this is with nginx's upload module (nonblocking) but it has its problems. Node.js is supposed to be a good candidate for this type of application. But how can I make node.js act as an upload_handler() for Django (http://docs.djangoproject… >>> More