MongoDB Driver Releases: April
We’ve had a big month with updates and improvements to our drivers. Here’s a summary:
- We released v1.0 of the Mongo-Hadoop connector, which provides working input and output adapters for MongoDB on Hadoop’s MapReduce.
- We released Node.js Driver v1.0.
- Aaron Heckmann made a bunch of bug fixes and feature updates to Mongoose 2.6.x
- The 1.4 release of the C# Driver now supports LINQ queries.
- The 1.6.2 release of the Ruby driver now implements socket timeout using non-blocking IO. This change improve performance when timeouts are enabled.
- There are a number of bug fixes in the PHP driver’s 1.2.10 release
- The PyMongo team pushed PyMongo 2.2, which has support for Python 3, Gevent and improved pooling.
MongoDB at Craigslist: 1 Year Later
Update: watch the video of Jeremy Zawodny and Chris Mooney’s talk on A Year of MongoDB at Craigslist at MongoSF ‘12
Last year, Craigslist moved their archive to MongoDB from MySQL. After the initial set up, we spoke with Jeremy Zawodny, software engineer at Craigslist and the author of High Performance MySQL (O’Reilly), and asked him some questions about their cluster. In advance of their talk at MongoSF tomorrow, we caught up with Jeremy to get the scoop on what’s happening at Craigslist one year later.
Last time we spoke you were building a MongoDB store for 5 Billion Documents. What do your numbers look like now?
We’re currently approaching the 3 billion mark. The 5 billion number was our target capacity when building the system. Back then we had about 2.5 billion documents that we migrated into MongoDB, and we’ve continued to add documents ever since then.
MongoDB: Powering the Magic and the Monsters at Stripe
Update: Watch the video of Greg Brockman’s talk on MongoDB for High Availability at MongoSF ‘12
Stripe offers a simple platform for developers to accept online payments. They are a long-time user of MongoDB and have built a powerful and flexible system for enabling transactions on the web. In advance of their talk at MongoSF on MongoDB for high availability, Stripe’s engineer, Greg Brockman spoke with us about what’s going on with MongoDB at Stripe.
Revamp of MongoDB’s Documentation
We’re revamping MongoDB’s documentation. The new design in the MongoDB Manual has an improved reference section and an index for simplified search. It will also eventually support multiple MongoDB versions at the same time.
This project is a work in progress, and things are changing quickly. Our goal is to consolidate, sharpen, organize, and continue to improve the documentation in support of MongoDB. For now, the new docs will live alongside the original MongoDB Wiki. But over the next few months, we’ll be transitioning everything to the new manual.
In the spirit of open source, the docs are housed on Github. Feedback is welcome! Feel free to fork the repository and issue pull requests. You can also open tickets in JIRA, and we’ll promptly address any suggestions.
Meet Variety, a Schema Analyzer for MongoDB
Variety is a lightweight tool which gives a feel for an application’s schema, as well as any schema outliers. It is particularly useful for
• quickly learning how data is structured, if inheriting a codebase with a production data dump
• finding all rare keys in a given collection
An Easy Example
We’ll make a collection, within the MongoDB shell:
db.users.insert({name: "Tom", bio: "A nice guy.", pets: ["monkey", "fish"], someWeirdLegacyKey: "I like Ike!"});
db.users.insert({name: "Dick", bio: "I swordfight."});
db.users.insert({name: "Harry", pets: "egret"});
db.users.insert({name: "Geneviève", bio: "Ça va?"}); MongoDB and Node.js at 10gen
With their strong roots in JavaScript, Node.js and MongoDB have always been a natural fit, and the Node.js community has embraced MongoDB with a number of open source projects. To support the community’s efforts, 10gen is happy to announce that the MongoDB Node.js driver will join the existing set of 12 officially supported drivers for MongoDB.
The Node.js driver was born out of necessity. Christian Kvalheim started using Node.js in early 2010. He had heard good things about MongoDB but was disappointed to discover that no native driver had yet been developed. So, he got to work. Over the past two years, Christian has done amazing work in his driver, and it has matured through the contributions of a large community and the rigors of production. For some time now, the driver has been on par with 10gen’s officially supported MongoDB drivers. So we were naturally thrilled to welcome Christian full time at 10gen to continue his work on the Node.js driver.
Grails in the Land of MongoDB
Groovy and Grails’ speed and simplicity are a perfect match to the flexibility and power of MongoDB. Dozens of plugins and libraries connect these two together, making it a breeze to get Grooving with MongoDB.
Using Grails with MongoDB
For the purpose of this post, let’s pretend we’re writing a hospital application that uses the following domain class.
class Doctor {
String first
String last
String degree
String specialty
} There are a few grails plugins that help communicate with MongoDB, but one of the easiest to use is the one created by Graeme Rocher himself (Grails project lead). The MongoDB GORM plugin allows you to persist all your domain classes in MongoDB. To use it, first remove any unneeded persistance-related plugins after you’ve executed the ‘grails create-app’ command, and install the MongoDB GORM plugin.
Operations in the New Aggregation Framework
Available in 2.1 development release. Will be stable for production in the 2.2 release
Built by Chris Westin (@cwestin63)
MongoDB has built-in MapReduce functionality that can be used for complex analytics tasks. However, we’ve found that most of the time, users need the kind of group-by functionality that SQL implementations have. This can be implemented using map/reduce, but doing so is more work than it was in SQL. In version 2.1, MongoDB is introducing a new aggregation framework that will make it much easier to obtain the kind of results SQL group-by is used for, without having to write custom JavaScript.
MongoSV Recap
Last week over 1,100 developers came together for MongoSV, the largest MongoDB conference to date. 10gen kicked off MongoSV with our inaugural MongoDB Masters program, which brought together MongoDB evangelists from around the world.
At the opening keynote, 10gen CTO Eliot Horowitz demoed a twitter app for #mongoSV tweets, featuring the new aggregation framework expected for the MongoDB 2.2 release. These gather all the tweets sent out with the hashtag #mongoSV and organizes them in by recency and most retweets. Get the source code for the demo app here
MongoDB On Microsoft Azure
A new preview release of the MongoDB controller for Azure is available. This release includes support for replica sets, and over the coming months, we’ll be adding support for MongoDB’s sharding facilities. We’ll also be working to more tightly integrate MongoDB with the features of Azure platform. Each member of a replica set is hosted by an instance of an Azure worker role, so the size of the replica set is determined by the number of instances configured for the the replica set worker roles. Each replica set worker role creates a child process to run the mongod server process. The controller defines an Azure worker role which represents a MongoDB cluster.
MongoDB Monitoring Service Docs Available
MongoDB Monitoring Service (MMS) documentation now available: http://mms.10gen.com/help/
Mongo Boston Recap
Last week 250 developers converged at the Microsoft New England Research and Design Center for Mongo Boston. Highlights from the event include presentations on MongoDB 2.0, how MTV leverages MongoDB for CMS, rapid prototyping, and more.
More photos from the event are available on the MongoDB Flickr page.
If you missed the event, join the Boston MongoDB User Group, which also meets at NERD. The next meeting is on November 15.
2.0 Presentation at New York MongoDB User Group
On Thursday MongoDB core committer Eliot Horowitz presented to the New York MongoDB User Group on the latest features in v2.0. The event was hosted by Sailthru, a MongoDB-powered startup doing intelligent email marketing. The meetup was announced Monday night and within a day was oversubscribed. After the presentation, we all went out for drinks to celebrate the release.
The NY MUG has over 1,000 members and meets monthly. There are also MongoDB user groups in San Francisco, Washington DC, London, Boston, Japan, and more. And if there isn’t a MongoDB meetup in your city, we’re happy to support you if you would like to start one.
Cache Reheating - Not to be Ignored
An important aspect to keep in mind with databases is the cost of cache reheating after a server restart. Consider the following diagram which shows several cache servers (e.g., memcached) in front of a database server.
This sort of setup is common and can work quite well when appropriate; it removes read load from the database and allows more RAM to be utilized for scaling (when the database doesn’t scale horizontally). But what happens if all the cache servers restart at the same time, say, on a power glitch in a data center?
MongoDB 2.0 Released
The MongoDB development team is pleased to announce the release of version 2.0.0. Version 2.0 is the latest stable release, following the March 2011 release of version 1.8. This release includes many new features, improvements to existing features, and performance enhancements.
Please note version 2.0 is a significant new release, but is 2.0 solely because 1.8 + 0.2 = 2.0; for example the upgrade from 1.6 to 1.8 was similar in scope.
Highlights of the 2.0 release:
- Concurrency improvements
- Index enhancements to improve size and performance
- Authentication with sharded clusters
- Replica Set Data Center Awareness
- Journaling is now enabled by default. Journal files are now compressed.
- User defined getLastError options
- Smaller default stack size to accommodate more connections
- Compact Command
- Geo-spatial features
- Multi-location documents
- Polygon searches
- Output map/reduce results to sharded collection
Source : http://blog.mongodb.org
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