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社会化海量数据采集爬虫框架搭建 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...他的好处可以支持规整网页数据抓取。我们使用的是google插件 XPath Helper，这个玩意可以支持在网页点击元素生成xpath，就省去了自己去查找xpath的功夫，也便于未来做到所点即所得的功能。正则表达式补充xpath抓取不到的数据，...
Logstash实践: 分布式系统的日志监控 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...到Email，File，Tcp，或者作为其它程序的输入，又或者安装插件实现和其他系统的对接，比如搜索引擎Elasticsearch。
总结：Logstash概念简单，通过组合可以满足多种需求。
3. Logstash的安装，搭建和配置
3.1. 安装Java
下载JDK压缩包...
How to configure PostgreSQL to accept all incoming connections
...of IPs to be authorized, you could edit /var/lib/pgsql/{VERSION}/data file and put something like
host all all 172.0.0.0/8 trust
It will accept incoming connections from any host of the above range.
Source: http://www.linuxtopia.org/online_books/database_guides/P...
How to correct TypeError: Unicode-objects must be encoded before hashing?
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The error already says what you have to do. MD5 operates on bytes, so you have to encode Unicode string into bytes, e.g. with line.encode('utf-8').
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How connect Postgres to localhost server using pgAdmin on Ubuntu?
I installed Postgres with this command
6 Answers
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How do you use bcrypt for hashing passwords in PHP?
Every now and then I hear the advice "Use bcrypt for storing passwords in PHP, bcrypt rules".
11 Answers
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namespaces for enum types - best practices
... a class you can:
prohibit (sadly, not compile-time) C++ from allowing a cast from invalid value,
set a (non-zero) default for newly-created enums,
add further methods, like for returning a string representation of a choice.
Just note that you need to declare operator enum_type() so that C++ wou...
Storing SHA1 hash values in MySQL
...d just waste an additional byte for the length of the fixed-length field.
And I also wouldn’t store the value the SHA1 is returning. Because it uses just 4 bit per character and thus would need 160/4 = 40 characters. But if you use 8 bit per character, you would only need a 160/8 = 20 character l...
Greenlet Vs. Threads
I am new to gevents and greenlets. I found some good documentation on how to work with them, but none gave me justification on how and when I should use greenlets!
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海量数据相似度计算之simhash和海明距离 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...实不是这样的，传统hash函数解决的是生成唯一值，比如 md5、hashmap等。md5是用于生成唯一签名串，只要稍微多加一个字符md5的两个数字看起来相差甚远；hashmap也是用于键值对查找，便于快速插入和查找的数据结构。不过我们主...