Recently in Distributed Computing Category

最近看代码时了解到的，顺手查了一下，在此留个记录：

SRV记录的作用是指明某域名下提供的服务。

例子：

_http._tcp.example.com. SRV 10 5 80. www.example.com

SRV后面项目的含义：

10 - 优先级，类似MX记录
5 - 权重
80 - 端口
www.example.com - 实际提供服务的主机名。

不过实际在Internet上用这个的似乎非常之少。

据 新浪科技 报道，受强烈地震影响，中美海缆、亚太1号、亚太2号海缆、FLAG海缆、亚欧海缆、FNAL海缆等多条国际海底通信光缆发生中断，中断点在台湾以南15公里的海域，造成附近国家和地区的国际和地区性通信受到严重影响。

以下场景纯属虚构，请勿对号入座。

技术：现在您的计算机名叫“COMPUTER-X5V89KP”，您需要我帮您做点什么吗？
客户：我需要让我这台计算机的计算机名叫“电脑”。
技术：很抱歉，这样做不太好，我建议您把计算机命名为“COMPUTER-X5V89KP”，这是因为您的计算机名中只能出现字母、数字和连字号(-)，并且连字号不能出现在第一个字符的位置，否则可能会给您的使用带来困难……
客户（不耐烦，打断）：电脑是你的还是我的？我就要让它叫“电脑”！
技术：好吧。

右下角的“WooCall”。

Junsu has mentioned SCTP, a stream protocol that is quite interesting. A KAME implementation for FreeBSD is available for years.

Google了一下发现无数模块的实现……

Today I have some ideas about P2P application framework. Would check if there is any available ones and whether they can fulfil my ideas. Maybe I would start a project to implement these ideas in Python and/or C++.

由于某种原因需要一口气inject大约80万封信，结果中间就不成了。后来发现似乎3000-10000/queue为宜。什么原因呢？

So it happens.

As the website states, it works by:

- Sending your page requests through Google machines dedicated to handling Google Web Accelerator traffic.
- Storing copies of frequently looked at pages to make them quickly accessible.
Downloading only the updates if a web page has changed slightly since you last viewed it.
- Prefetching certain pages onto your computer in advance.
- Managing your Internet connection to reduce delays.
- Compressing data before sending it to your computer.

Today, Wietse Venema has announced postfix 2.2.0-RELEASE. To quote him:

The official Postfix 2.2 release adopts widely used third-party patches and a bunch of new functionality that was developed over the past year.

Below is a summary of the changes. These and more are detailed in the RELEASE_NOTES document, which also describe the incompatible changes that you should be aware of BEFORE upgrading from Postfix
2.1 or earlier.

- TLS and IPv6 support are now built into Postfix, based on code
from third-party patches.

- Extended query interface for LDAP, MySQL and PostgreSQL with free
form SQL queries, and domain name filters to reduce unnecessary
lookups.

Someone has disclosed that he is implementing iSCSI on FreeBSD, at scsi@. iSCSI is essential technology that is highly scalable and looks quite promising.

在火车上跟HD聊了聊关于GNS等等一系列项目的想法。所谓GNS是一个全局的目录服务，包括客户和服务器两部分，客户运行在提供各种不同服务的机器上(www, databases, etc)。

客户启动时，向服务器发出一个“WAKEUP”信号，服务器则向需要该服务的所有服务器发出同样信号；反之，当客户所在的机器准备下线时，也类似地发出信号。

www, databases等服务的consumer据此在自己的本地可用服务表中添加/删除目录项。