MongoDB 1.2.2 is mostly a bug fix release as can be seen from the ☞ announcement.
Project Voldemort 0.70
This new version of Project Voldemort is including one of the most awaited features: online rebalancing. While the ☞ official announcement makes it clear that rebalancing has been extensively tested, I couldn’t find a good description of the rebalancing algorithm.
There are other interesting features in the release that I’d like to mention:
- New failure detector merged into the main branch
- Beta mechanism for restoring all of node’s data from replicas on demand. This is an alternative to a more gradual mechanism provided by read-repair.
While version change sounded like a minor release, the latest version of Terrastore, the partitioned and elastic document database built on top of Terracotta, features quite a few interesting new things:
- New, configurable, server-to-master reconnection procedure and improved graceful shutdown procedure for server nodes.
- New socket-based internal communication layer, improving multi-node performances and lowering resource consumption.
- New transparent rerouting of client requests in case of failing nodes.
- Improved rebalancing in case of nodes leaving or failing.
I must confess that if I’d be managing Terrastore releases and knew that these features are well tested, I would definitely jumped a couple of versions!
Riak 0.7.1 seems to be mostly a bugfix release, with a pretty cryptic ☞ announcement (at least for someone not familiar with the Riak source code).