MongoDB 2.2 Released

  Sent to you by Martin via Google Reader: MongoDB 2.2 Released via The
MongoDB NoSQL Database Blog on 8/29/12

We are pleased to announce the release of MongoDB version 2.2. This
release includes over 1,000 new features, bug fixes, and performance
enhancements, with a focus on improved flexibility and performance. For
additional details on the release:

- 2.2 Release Notes
- MongoDB Downloads
- MongoDB Manual
- Version 2.2 Online Conference New Features Aggregation Framework
The Aggregation Framework is available in its first production-ready
release as of 2.2. The aggregation framework makes it easier to
manipulate and process documents inside of MongoDB, without needing to
use Map Reduce, or separate application processes for data manipulation.

See the aggregation documentation for more information.
Additional “Data Center Awareness” Functionality
2.2 also brings a cluster of features that make it easier to use
MongoDB for larger more geographically distributed contexts. The first
change is a standardization of read preferences across all drivers and
sharded (i.e. mongos) interfaces. The second is the addition of “tag
aware sharding,” which makes it possible to ensure that data in a
geographically distributed sharded cluster is always closest to the
application that will use that data the most.
Improvements to Concurrency
v2.2 eliminates the global lock in the mongod process. Locking is now
per database. In addition a new subsystem avoids locks under most
page-fault events; thus concurrency improves even on systems with a
single database. Parallelism in application of writes on secondaries is
enhanced also. See this video for more details.

We’re looking forward to your feedback on 2.2. Keep the Jira Issues,
blog posts, user group posts, and tweets coming.

- Eliot and the 10gen/MongoDB team

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