I'm pleased to announce the release of swift 1.5.0. This is a big release with some big changes. I recommend that deployers upgrade, and, as always, you can upgrade your production cluster with no downtime.
Swift docs: http://swift.openstack.org Swift code: http://github.com/openstack/swift Openstack swift PPAs: https://launchpad.net/~swift-core/+archive/release Launchpad page: https://launchpad.net/swift/folsom/1.5.0 The changelog for 1.5.0 is at https://github.com/openstack/swift/blob/master/CHANGELOG. I'd like to highlight a few of the more significant changes. First, you will notice that the top three bullet points in the 1.5.0 changelog mention that config changes are required. Proxy server logging has been refactored to live in a new middleware module, proxy-logging. The sample config file for the proxy server has been updated to show how this new middlware fits into the proxy server (https://github.com/openstack/swift/blob/master/etc/proxy-server.conf-sample). This change requires a config change for all existing deployments, but it does not introduce any new dependencies. We have also remove the swift3 middleware from the swift project. This is the AWS S3 API compatibility layer for swift. The Openstack PPB has decided that 3rd party APIs should be external to the Openstack projects (http://eavesdrop.openstack.org/meetings/openstack-meeting/2012/openstack-meeting.2012-05-08-20.00.html). As a result, the swift3 middleware now lives at https://github.com/fujita/swift3 and is managed as a separate project apart from swift. Any deployers who have been using the swift3 middleware will now have a dependency on the swift3 project and need to update their proxy config to reflect the new dependency. The last big change requiring config changes when upgrading to 1.5.0 is a DB preallocation feature that has been added. Swift account and containers are implemented on disk as sqlite databases. In order to increase performance on spinning media, the code that accesses these DBs may at times preallocate disk space for the data. While this obviously uses more disk space, it also limits disk fragmentation and therefore increases performance on spinning media where random IO is very expensive. However, if a deployment uses SSDs, space is very expensive and random IO is not. In this case, DB preallocation is a bad idea. Because any process that uses swift's code to access the DB but has not explicitly told the DB to not preallocate space may trigger the preallocation code path, the preallocation default has been set to False. This is a change from previous version of swift which always preallocated space. It is very important to explicitly turn this option on for account and container servers that are using traditional (spinning) media to store the data[1]. The provided sample config files for the account and container servers show how this value should be set. https://github.com/openstack/swift/blob/master/etc/account-server.conf-sample https://github.com/openstack/swift/blob/master/etc/container-server.conf-sample There are also two other new features in swift that should be mentioned. First, swift now supports versioned objects. Docs for this feature are found at http://swift.openstack.org/overview_object_versioning.html. Second, swift now has a deep integration with StatsD metrics. Nearly every part of the system can now be monitored with StatsD. You can find more details at http://swift.openstack.org/admin_guide.html#reporting-metrics-to-statsd. Note that this feature is considered "beta" since some of the metric names may change. The "beta" label does not reflect this feature's stability or fitness for production--it is both stable and production-ready. On a community side, Swift 1.5.0 is the work of 23 contributors, including 7 new contributors. I'm happy to see the continued growth of the swift developer community. --John [1] As a footnote, it is a good idea to consider using SSDs for account and container servers on larger clusters and clusters that require higher performance.
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