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armsword的涅槃之地

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armsword的涅槃之地 | armsword.com Reviews
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搜索引擎,调度系统,北邮人,阿里巴巴,美团,滴滴出行,Presto,Linux,C/C++
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1 archives
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3 分布式sql查询引擎presto原理介绍
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5 2012年秋季,facebook启动presto项目
6 功能和优点
7 ad hoc,期望查询时间秒级或几分钟
8 支持jdbc/odbc连接
9 ansi sql,支持窗口函数,join,聚合,复杂查询等
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armsword的涅槃之地 | armsword.com Reviews

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Category: 我的生活 - armsword的涅槃之地

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Category: Database - armsword的涅槃之地

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Category: 计算机网络 - armsword的涅槃之地

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Category: 算法/数据结构 - armsword的涅槃之地

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几种Hash算法的实现 - armsword的涅槃之地

http://armsword.com/2015/03/02/several-realization-of-hash-algorithm

本算法由于在Brian Kernighan与Dennis Ritchie的 The C Programming Language 一书被展示而得名. Ch = ( size t. Hash = hash * 131. Ch; / 也可以乘以31、131、1313、13131、131313. 如将上式表达为 hash = hash 7 hash 1 hash ch;. Val = (val 5. Val (*str );. Val = val * num (*str );. Ch = ( size t. Hash = (size t)ch (hash 6) (hash 16) - hash;. Unsigned int APhash(char *str). Int i = 0. Str ) ( val. Str ) ( val. Ch = ( size t. Hash = ch;. 其实关于为什么要用异或,我搜索了下原因,见 Why is XOR the default way to combine hashes? Nr = ( (nr and 63. Str ) (nr 8.

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About

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This is Xu Ruochen’s blog.

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过年了 | Eric's World

http://dreamshield.net/2015/02/17/Lunar-New-Year-Is-Coming

厌倦了 靠天吃饭的日子 : 每当单位里的同事聊起工资,在那里抱怨,我只会以微笑进行回复。 但是我坚信:在尊重客观规律的前提下 天道酬勤 你努力了,不一定会有收获 但是如果你不努力,那么一定不会有收获的。 没有伞的孩子,一定要努力奔跑 最后以苏轼的一首 定风波 来结束吧!

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MySQL | Eric's World

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算法与数据结构 | Eric's World

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单链表基本操作 | Eric's World

http://dreamshield.net/2015/02/19/Basic-Operations-of-Single-Linked-List

Linkedlst.h文件包含了数据类型的定义与单链表操作的声明;linkedlist.c文件包含了单链表操作的具体实现。 DATAFIELD data; / 链表节点数据域. Node *next; / 链表节点指针域. 125; Node, *List;. DATAFIELD data, List pNode). DATAFIELD data, const. DATAFIELD data, const. DATAFIELD data, const. DATAFIELD data, const. Return [List] pHead 链表头指针. PHead = (List) malloc. Node) ; / 申请空间. PHead- next = NULL. Param [const list] pHead 链表头指针. Return [Boolean] 空则返回真,非空返回假. Param [List] pHead 链表头指针. List pTmp = pHead- next;. PTmp = pTmp- next;. Param [const list] pHead 链表头指针. PTmpN...

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MySQL | Eric's World

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Arms With Ethics partners with communities, law enforcement agencies, businesses and local governments in every region of the country to help reduce the illegal flow and use of firearms. What if we could stop the illegal flow of guns in our country? Each year we would help protect more than:. To learn more about our cause or to join with us, click here. Or on the appropriate link below. Arms With Ethics acknowledges and respects America’s responsible gun owners and we are committed to helping them keep t...

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Arms With Ethics partners with communities, law enforcement agencies, businesses and local governments in every region of the country to help reduce the illegal flow and use of firearms. What if we could stop the illegal flow of guns in our country? Each year we would help protect more than:. To learn more about our cause or to join with us, click here. Or on the appropriate link below. Arms With Ethics acknowledges and respects America’s responsible gun owners and we are committed to helping them keep t...

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Arms With Ethics partners with communities, law enforcement agencies, businesses and local governments in every region of the country to help reduce the illegal flow and use of firearms. What if we could stop the illegal flow of guns in our country? Each year we would help protect more than:. To learn more about our cause or to join with us, click here. Or on the appropriate link below. Arms With Ethics acknowledges and respects America’s responsible gun owners and we are committed to helping them keep t...

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Arms With Ethics partners with communities, law enforcement agencies, businesses and local governments in every region of the country to help reduce the illegal flow and use of firearms. What if we could stop the illegal flow of guns in our country? Each year we would help protect more than:. To learn more about our cause or to join with us, click here. Or on the appropriate link below. Arms With Ethics acknowledges and respects America’s responsible gun owners and we are committed to helping them keep t...

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Funding Comprehensive Prosthetic Rehabilitation for Upper Extremity Amputees. Amputee Coalition of America. Our hands are our tools with which we connect to the physical world.". Kathleen Yancosek, ABD, OTR/L, CHT. Steve, 39, lost arm and hand by electrocution; "Since I received my prostheses, I enjoy eating again. I'm even back to driving a race car! Jason Koger - Life Resumed. How You Can Help/Donate Now. Arms Within Reach Foundation. 3606 N. 156th Street • Suite 101-117. Omaha, NE 68116.

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armsword的涅槃之地

2017年11月,11888 commits,203 releases,198 contributors. Client Protocol: HTTP JSON, support various languages(Python, Ruby, PHP, Node.js Java). No fault tolerance 当一个Query分发到多个Worker去执行时,当有一个Worker因为各种原因查询失败,那么Master会感知到,整个Query也就查询失败了,而Presto并没有重试机制,所以需要用户方实现重试机制。 Memory Limitations for aggregations, huge joins 比如多表join需要很大的内存,由于Presto是纯内存计算,所以当内存不够时,Presto并不会将结果dump到磁盘上,所以查询也就失败了,但最新版本的Presto已支持写磁盘操作,这个待后续测试和调研。 Https:/ tech.meituan.com/presto.html. Agent = localhost:9312:chunk2 本地. Https:/ share.wei...

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