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                                ext文件系统


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                                    在一些高速发展的web系统中，传统的哈希函数，如hash取模法，存在明显缺陷。随着系统访问压力的增长，缓存系统不得不通过增加机器节点的方式提高集群的相应速度和数据承载量。增加机器意味着，如果按照hash取模的方式，在增加机器节点的这一时刻，大量的缓存不能命中，缓存数据需要重新建立，甚至是整体迁移，这一瞬间会给DB带来极高的系统负载。

一致性Hash算法背景

　　一致性哈希算法在...
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                                前言

  上一篇分别对三种云服务（IaaS、PaaS、SaaS）的应用模式进行了探讨，现在对IaaS云服务的相关流程基于框架和源码进行探索。

IaaS框架

  Openstack作为当前IaaS云服务中的一个开源的框架，被当前广泛的部署和实践，其中由于其开源的特性，也被作为研究云服务结构的典型。

   当前IaaS云服务应用最为广泛，主要提供云虚拟机相关服务，其中Openstac...
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                                这几天在重新配置openstack环境，正在对实例进行操作的时候，服务器报错了，如下图，一直重新登录也没用。忽然有点不知所措，于是去查看apache服务器的日志/var/log/httpd/error_log发现如下，可以看到，这个登录错误不是用户名和密码引起的，log日志说明已经登陆成功。然后我又去谷歌了一下相关的错误，终于在一个国外的网站上找到了答案，是网页的session到期了。[Sun
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                                一.什么是NativeMethod  简单地讲，一个NativeMethod就是一个java调用非java代码的接口。一个NativeMethod是这样一个java的方法：该方法的实现由非java语言实现，比如C。这个特征并非java所特有，很多其它的编程语言都有这一机制，比如在C＋＋中，你可以用extern“C”告知C＋＋编译器去调用一个C的函数。
“Anativemethod
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                                前言

    linux的日志系统一直以来都是在linux上开发必学的一部分内容。之前在学习openstack的时候，在对openstack组件的发生的错误进行调试时，老师就说要多看日志的报错，从这里找到相关线索再去修改配置文件。结果很多的报错都是通过组件对应的日志文件反映出来而修改成功的，因此使用好linux日志系统对了解linux编程有很大的帮助。
日志文件简述

其中日志一
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