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hiromark 2009/12/28
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hiromark 2009/11/13
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Brewerâ€™s CAP Theorem
We know three chords but you can only pick two On Friday 4th June 1976, in a small upstairs room away from the main concert auditorium, the Sex Pistols kicked off their first gig at Manchesterâ€™s Lesser Free Trade Hall. Thereâ€™s some confusion as to who exactly was there in the audience that night, partly because there was another concert just six weeks later, but mostly because itâ€™s considered to b
hiromark 2009/09/07
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BrewersCapTheorem - ãƒ–ãƒªãƒ¥ãƒ¯ãƒ¼ã® CAP å®šç†
BrewersCapTheorem - ãƒ–ãƒªãƒ¥ãƒ¯ãƒ¼ã® CAP å®šç† ç›®æ¬¡ ã“ã®æ–‡æ›¸ã«ã¤ã„ã¦ ãƒ–ãƒªãƒ¥ãƒ¯ãƒ¼ã® CAP å®šç† - Amazon ã¨ eBay ã®ã‚¯ãƒ¼ãƒ«ã‚¨ã‚¤ãƒ‰ ãƒ–ãƒªãƒ¥ãƒ¯ãƒ¼ã®(CAP)å®šç† ä¸€è²«æ€§ (Consistency) å¯ç”¨æ€§ (Availability) åˆ†å‰²è€æ€§(Partition Tolerance) å®šç†ã®é‡è¦æ€§ å›³è§£ã§è¨¼æ˜Ž CAP ã¨æŠ˜ã‚Šåˆã† 1. åˆ†å‰²è€æ€§ã‚’è«¦ã‚ã‚‹ 2. å¯ç”¨æ€§ã‚’è«¦ã‚ã‚‹ 3. ä¸€è²«æ€§ã‚’è«¦ã‚ã‚‹ 4. BASE ã«è·³ã¶ 5. å•é¡Œã‚’ã‹ã‚ã—ã¦è¨è¨ˆã™ã‚‹ ã¾ã¨ã‚ å‚è€ƒæ–‡çŒ® ãƒ–ãƒªãƒ¥ãƒ¯ãƒ¼ã® CAP å®šç† ã“ã®æ–‡æ›¸ã«ã¤ã„ã¦ "Brewer's CAP Theorem - The kool aid Amazon and Ebay have been drinking" ã®æ—¥æœ¬èªžè¨³ã§ã™. http://www.julianbrowne.com/article/view
hiromark 2009/09/07
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Eventually Consistent
Eventually ConsistentDecember 19, 2007 â€¢ 2491 words I wrote a first version of this posting on consistency models in December 2007, but I was never happy with it as it was written in haste and the topic is important enough to receive a more thorough treatment. ACM Queue asked me to revise it for use in their magazine and I took the opportunity to improve the article. I posted an update to this art
hiromark 2009/06/03
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BASE: An Acid Alternative - ACM Queue
July 28, 2008 Volume 6, issue 3 PDF Base: An Acid Alternative In partitioned databases, trading some consistency for availability can lead to dramatic improvements in scalability. Dan Pritchett, Ebay Web applications have grown in popularity over the past decade. Whether you are building an application for end users or application developers (i.e., services), your hope is most likely that your app
hiromark 2009/05/27
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hiromark 2009/05/22
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CAPå®šç†ã¨ã„ã†ã®ã¯ã€ Consistency Availability Partitions ã¨ã„ã†çŠ¶æ…‹ã®2ã¤ã¾ã§ã—ã‹é”æˆã§ããªã„ã€‚ï¼“ã¤ã™ã¹ã¦ã‚’é”æˆã™ã‚‹ã“ã¨ã¯ã§ããªã„ã¨ã„ã†å®šç†ã§ã‚ã‚‹ã€‚ä¾‹ãˆã°Consistencyï¼ˆä¸€è²«æ€§ï¼‰ã¨Availability(å¯ç”¨æ€§)ã‚’åŒæ™‚ã«æº€è¶³ã•ã›ã‚‹ã¨Partitions(åˆ†æ•£)ã‚’é”æˆã™ã‚‹ã®ã‚’ã‚ãã‚‰ã‚ã‚‹ã—ã‹ãªã„ã€‚å¯ç”¨æ€§ã¨åˆ†æ•£æ€§ã‚’åŒæ™‚ã«æº€è¶³ã•ã›ã‚‹ã«ã¯Consistencyï¼ˆä¸€è²«æ€§ï¼‰ã‚’ã‚ãã‚‰ã‚ã‚‹ã€‚ã™ãªã‚ã¡Eventually ConsistentãªçŠ¶æ…‹ã‚’å—ã‘å…¥ã‚Œã‚‹ã€‚ ããƒ¼ã‚†ãƒ¼çŠ¶æ…‹ã‚’å—ã‘å…¥ã‚Œã‚‹ã¨ã‚¹ã‚±ãƒ¼ãƒ©ãƒ“ãƒªãƒ†ã‚£ã‚’é”æˆã§ãã‚‹ã‚ˆã†ã«ãªã‚‹ã®ã§ã€å·¨å¤§ãªãƒ‡ãƒ¼ã‚¿ã‚»ãƒ³ã‚¿ãƒ¼ã®ä¸ã«å®‰ã„PCã‚µãƒ¼ãƒãƒ¼ã‚’å¤§é‡ã«ãŠã„ã¦CAPã®Cã‚’è‹¥å¹²çŠ ç‰²ã«ã—ã¤ã¤ã€é«˜é€Ÿãªãƒ‡ãƒ¼ã‚¿å‡¦ç†ã‚’è¡Œã†ã€‚ãã®ã‚ˆã†ãªè¨ˆç®—ãƒ¢ãƒ‡ãƒ«ã§ã‚ã‚‹ã€‚ ã‚¯ãƒ©ã‚¦ãƒ‰æ™‚ä»£ã®è¨ˆç®—ãƒ‘ãƒ©ãƒ€ã‚¤ãƒ ãŒRDBMSãŒ30å¹´é–“ç ”ç©¶é–‹ç™ºã—ã¦ã„ãŸACIDãƒ‘ãƒ©ãƒ€ã‚¤ãƒ ã‹ã‚‰CAP
hiromark 2009/05/21
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yohei-y:weblog: CAPã®Cã¨ACIDã®C
CAP å®šç†ã¨ BASE ã®æ¦‚å¿µã‚’è€ƒãˆãŸã®ã¯ UCB ã® Brewer å…ˆç”Ÿã§ã€å½¼ã¯ inktomi ã®å‰ã„äººã ã£ãŸã¨ã„ã†ã®ã¯å‰å›žè¿°ã¹ãŸã€‚ å½“æ™‚ã®inktomiã¯Yahoo!ã‚„ Microsoftã€ãã‚Œã«gooã«ã‚‚æ¤œç´¢ã‚¨ãƒ³ã‚¸ãƒ³ã‚’æä¾›ã—ã¦ã„ã¦ã€1å„„ä»¥ä¸Šã®Webãƒšãƒ¼ã‚¸(ãƒ†ãƒ©ãƒã‚¤ãƒˆç´šã®ãƒ‡ãƒ¼ã‚¿)ã‚’æ‰±ã£ã¦ã„ãŸã‚ˆã†ã ã€‚ æ‰‹å…ƒã®WEB+DB PRESS Vol.49 ã®ã¯ã¦ãªãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ãƒªãƒ‹ãƒ¥ãƒ¼ã‚¢ãƒ«è¨˜äº‹ã«ã‚ˆã‚‹ã¨ã€ç¾åœ¨ã®ã¯ã¦ãªãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ã¯1160ä¸‡URLã¨100GBã®HTMLãƒ‡ãƒ¼ã‚¿(åœ§ç¸®æ¸ˆã¿)ã‚’æ‰±ã£ã¦ã„ã‚‹ã‚‰ã—ã„ã®ã§ã€ã–ã£ãã‚Šã„ã£ã¦98å¹´ã®æ™‚ç‚¹ã§inktomi ã¯ç¾åœ¨ã®ã¯ã¦ãƒ–ã®10å€ã®ãƒ‡ãƒ¼ã‚¿ã‚’æ‰±ã£ã¦ã„ãŸã¨ã„ã£ã¦ã‚‚ã„ã„ã€‚inktomiã§ä½¿ã£ã¦ã„ãŸã‚³ãƒ³ãƒ”ãƒ¥ãƒ¼ã‚¿ã®æ€§èƒ½ã¯ç¾åœ¨ã®PCã‚µ ãƒ¼ãƒã«æ¯”ã¹ã‚Œã°1/10ç¨‹åº¦ã®æ€§èƒ½ãªã®ã§ã€ã‚·ã‚¹ãƒ†ãƒ å…¨ä½“ã§ã¿ã‚‹ã¨ç¾åœ¨ã®ã¯ã¦ãƒ–ã®100å€ã®è¦æ¨¡ã«ãªã‚‹ã ã‚ã†ã‹ã€‚ çµæžœçš„ã«ã¯ã€inktom
hiromark 2009/05/12
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yohei-y:weblog: yokohama.pm ã§ Eventually Consistent ã®è©±ã‚’ã—ã¦ãã¾ã—ãŸ
å…ˆé€±ã®é‡‘æ›œæ—¥ã«é–‹å‚¬ã•ã‚ŒãŸ yokohama.pm ã§ã€æœ€è¿‘ã®ã“ã®ãƒ–ãƒã‚°ã®ãƒ¡ã‚¤ãƒ³ãƒã‚¿ã§ã‚ã‚‹ CAPã¨BASEã¨Eventually Consistentã«ã¤ã„ã¦ãŠè©±ã—ã¦ãã¾ã—ãŸã€‚ ã“ã®ãƒã‚¿ã€ã‚ã¾ã‚Šå…¬ã®å ´ã§è©±ã™ãƒãƒ£ãƒ³ã‚¹ãŒãªã„ã®ã§ã“ã†ã„ã†æ©Ÿä¼šã‚’ã„ãŸã ã‘ã¦ã‚ˆã‹ã£ãŸã§ã™ã€‚ ã‚ã‚ŠãŒã¨ã†ã”ã–ã„ã¾ã—ãŸã€‚ CAPã¨BASEã¨Eventually ConsistentView more presentations from yohei. æœ€è¿‘ãªã«ã‹ã¨å¿™ã—ãã¦ã‚ã‚“ã¾ã‚Šæ›´æ–°ã§ãã¾ã›ã‚“ãŒã€ ã¾ã ç¶šãäºˆå®šã§ã™ã€‚ ãã‚“ã˜ã‚ƒãƒ¼ã
hiromark 2009/05/12
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yohei-y:weblog: CAP ã¨ BASE ã«ã¤ã„ã¦èª¿ã¹ãŸã“ã¨
æ™‚ç³»åˆ—ã§ 1990å¹´ä»£å¾ŒåŠ: Eric Brewer (UCB)ãŒ inktomi ã§ã„ã‚ã„ã‚ä½œã‚‹ CAPã¨BASEã®åŸºç¤ŽãŒã§ãã‚‹ http://www.ccs.neu.edu/groups/IEEE/ind-acad/brewer/ 2000å¹´7æœˆ19æ—¥: Eric Brewer ãŒ PODC (Principles of Distributed Computing) ã®åŸºèª¿è¬›æ¼”ã§ CAP å®šç†?ã¨ BASE ã‚’ç™ºè¡¨ CAP ã¯ Brewer äºˆæ¸¬ã¨ã—ã¦çŸ¥ã‚‰ã‚Œã‚‹ã‚ˆã†ã«ãªã‚‹ ã“ã®æ™‚ç‚¹ã§ã€inktomiã¨åŒç‰ã‚¹ã‚±ãƒ¼ãƒ«ã®Webã‚µãƒ¼ãƒ“ã‚¹ã®å•é¡Œã«å¯¾å‡¦ã—ã¦ã„ãŸäººã¯ã‚ã¾ã‚Šã„ãªã‹ã£ãŸã®ã‹ã‚‚ã—ã‚Œãªã„ 2002å¹´ MIT ã® Seth Gilbert ã¨ Nancy Lynch ãŒ CAP ã‚’å½¢å¼åŒ– ã“ã“ã§ Brewer ã® CAP ãŒæ™´ã‚Œã¦å®šç†ã¨ãªã£ãŸ ã“ã®é–“ã€ã‚ˆãã‚ã‹ã‚‰ãš 2007å¹´-: eBay ã®
hiromark 2009/03/03
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