Data deduplication provides a new approach to store data and eliminate duplicate data in chunk level. A typical data deduplication workflow can be explained like this. File metadata describes how to restore the file use unique chunks. Chunk level ded…

偶尔看到data deduplication的博客,还挺有意思,记录之 http://blog.csdn.net/liuben/article/details/5829083?reload http://qing.blog.sina.com.cn/tj/88ca09aa33000uyo.html…

数据去重(data deduplication)是大数据领域司空见惯的问题了.除了统计UV等传统用法之外,去重的意义更在于消除不可靠数据源产生的脏数据--即重复上报数据或重复投递数据的影响,使计算产生的结果更加准确. 介绍下经常使用的去重方案: 一.布隆过滤器(BloomFilter) 基本原理: BloomFilter是由一个长度为m比特的位数组(bit array)与k个哈希函数(hash function)组成的数据结构.位数组均初始化为0,所有哈希函数都可以分别把输入数据尽量均匀地散列.…

What Design and implement ClearBox which allows a storage service provider to transparently attest to its customers the deduplication patterns of the (encrypted) data that it is storing. Why Storage saving has not directly benefit to users as there i…

论文链接 https://link.springer.com/article/10.1007/s11704-017-7119-0 这篇论文试图解决的问题是在cache 环节之前,prefetch-cache 进来的可能无关的 fingerprint 造成的cache pollution问题,即可能把没有用的 fingerprint 换入 cache,造成 cache 污染的问题. 这篇论文的贡献:提出了一种新的针对 prefetch 进来的 fingerprint 替换策略,并且提出了一种 ad…

https://blogs.technet.microsoft.com/filecab/2012/05/20/introduction-to-data-deduplication-in-windows-server-2012/ https://msdn.microsoft.com/en-us/library/windows/desktop/hh449202(v=vs.85).aspx https://www.usenix.org/conference/atc12/technical-sessio…

Zero-Chunk Suppression 检测全0数据块,将其用预先计算的自身的指纹信息代替. Detect zero chunks and replace them with a special code word by pre-calculating the fingerprint of the chunk filled with zeros. Chunk Index Page-oriented Approach 通过数据块索引来分配编码,假设使用基于分页的磁盘的哈希表来实现块索引,并且…

这篇文章主要基于上一篇http://www.cnblogs.com/qindy/p/6242714.html的基础上,create a sample workflow by SharePoint Designer 2013. 这里简要说一下我们接下来需要应用workflow完成怎样的一个功能:当在list中add item的时候自动触发workflow来更新title的value. 首先创建一个Custom List named 'MyList'  Site Contents-->add an…

Seven Python Tools All Data Scientists Should Know How to Use If you’re an aspiring data scientist, you’re inquisitive – always exploring, learning, and asking questions. Online tutorials and videos can help you prepare you for your first role, but t…

dedup util是一款开源的轻量级文件打包工具,它基于块级的重复数据删除技术,可以有效缩减数据容量,节省用户存储空间.目前已经在Sourceforge上创建项目,并且源码正在不断更新中.该工具生成的数据包内部数据部局(layout)如下: --------------------------------------------------| header | unique block data | file metadata |--------------------------------…