First ScyllaDB Summit

http://www.scylladb.com/summit/

Scylla is the world’s fastest column-store database: the functionality of Apache Cassandra with the speed of a light key/value store.

Raw speed isn’t just a nice benchmark or a low cloud bill. Scylla’s order of magnitude improvement in performance opens a wide range of possibilities.  Instead of designing a complex data model to achieve adequate performance, use a straightforward data model, eliminate complexity, and finish your NoSQL project in less time with fewer bugs.

Performance improvements enable not just reduction in hardware resources, but also a reduction in architecture, debugging, and devops labor. Scylla combines the  simple and familiar Cassandra architecture with new power to build a data model that fits the application, not tweak the model to fit the server.

Drop in replacement solution

THE TALKS

Come to Scylla Summit for talks on performance tuning, user success stories, data modeling, upcoming features, and more.

One event brings together the whole Scylla community – from core developers to DevOps professionals, to client developers, and NoSQL architects. We are still accepting proposals for talks—see the Call for Papers section for details.

CALL FOR PAPERS

Share your experience with ScyllaDB! Tell us how Scylla is used in your organization. Topics of interest include:

  • Best practices
  • Scylla use cases
  • Integration with analytics and IoT workloads
  • Scylla projects of all kinds – from small clusters to Internet scale

Please submit your abstract to cfp@scylladb.com. The deadline for abstracts is August 1, 2016.

Abstract should be no longer than 500 words. Please include a targeted audience level (novice, intermediate, expert), your name, affiliation, email address, a short speaker bio, and a phone number we can use to contact you.

More info:

http://www.scylladb.com/
http://www.scylladb.com/summit/

非root用户使用virt-manager关闭root认证

参考:https://ask.fedoraproject.org/en/question/45805/how-to-use-virt-manager-as-a-non-root-user/

从Fedora20开始,virt-manager实现了PlocyKit,所以普通用户使用virt-manager需要root权限验证。
如果想让某个组的用户使用virt-manager免去root权限验证,可以新增一个polkit规则。

polkit.addRule(function(action, subject) {
  if (action.id == "org.libvirt.unix.manage" && subject.local && subject.active && subject.isInGroup("wheel")) {
      return polkit.Result.YES;
  }
});

清理友情连接 cleanup links

今天把友情连接清理了以下,发现有很多链接已经失效,好多网站已经很久很久没有更新。但同时看到一些人很频繁的在做技术分享、读书分享、生活乐趣分享。

一是感慨时间变迁,二十为坚持下来的同学朋友感到欣慰,从这些人现在的生活状态能感受到很多积极向上的东西。当然不更新的朋友可能很忙,或者在专心做一些很有意义的事情。

现在各种媒体网络,分享很方便,但是网站、博客形式的深度思考分享,仍然有存在意义。这里只留给愿意来读的人,而不像朋友圈一样,强制分享,大家都很反感被广告、垃圾信息强奸。

推荐几个更新比较及时、且高质量的链接:

扩大亚马逊EC2上EBS分区的存储空间

Expanding the Storage Space of an EBS Volume on Linux

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-expand-volume.html

先为分区创建快照,然后再将快照恢复成新的分区,这个时候可以指定新分区大小。把原来磁盘卸掉,加载新分区。这里指定分区名为/dev/sda1,这样默认就是可启动的根分区了。

migrate to Fedora 24

After used Mac Pro more than one year as desktop, I bought a Dell XPS (13.3) laptop, and installed latest Fedora 24. Although I always use ubuntu/centos servers and ubuntu/fedora virtual machines, but the new system makes a exciting, the nature key shortcuts are very convenient.

Recommended some Gnome Extensions:
– Dash to Dock: use it to hold taskbar on the left side.
https://extensions.gnome.org/extension/307/dash-to-dock/

My friend Chun also loves my new system, he was shocked by big release number of Fedora, he still remember the days we were confused by unstable Feodra Core 5.

Continue reading “migrate to Fedora 24”