分散システム処ç†ãƒ¢ãƒ‡ãƒ«ã«é–¢ã™ã‚‹å‹•å‘ã«ã¤ã„ã¦ï¼ˆMapReduceã‹ã‚‰Borgã¾ã§ï¼‰è©³ç´°ã«ã¤ã„ã¦ã¯å¾Œè¿°ã—ã¾ã™ãŒã€MapReduceã®å‡¦ç†ãƒ¢ãƒ‡ãƒ«ã¯ã€ä¸Šè¨˜ã®é€šã‚Šå„区分ã”ã¨ã«ãã‚Œãžã‚Œå˜ç´”化（é™å®šï¼‰ã•ã‚ŒãŸãƒ¢ãƒ‡ãƒ«ã§ã‚ã£ãŸã¨è¨€ãˆã¾ã™ã€‚ ã¾ãŸã€MapReduceã®é–¢æ•°ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ãŠã‚ˆã³ã‚°ãƒ©ãƒ•çš„ãªç‰¹å¾´ã‚‚åˆã‚ã›ã¦ä»¥ä¸‹ã«æ•´ç†ã—ã¦ã¿ã¾ã™ã€‚ 関数プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°çš„ãªç‰¹å¾´ MapãŠã‚ˆã³Reduceフェーズã¯ã€ãã‚Œãžã‚Œé–¢æ•°åž‹ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®MapãŠã‚ˆã³Reduce処ç†ã‚’モデル化ã—ãŸã‚‚ã®ã§ã™ã€‚MapReduceã¯ã€å‚ç…§é€éŽæ€§ãŒã‚る純粋ãªé–¢æ•°å‡¦ç†ã¨è¨€ãˆã¾ã™ã€‚å‚ç…§é€éŽæ€§ã¨ã¯å…¥åŠ›ã«ã‚ˆã‚Šå‡ºåŠ›ãŒä¸€æ„ã«æ±ºã¾ã‚‹æ€§è³ªã®ã“ã¨ã§ã™ã€‚言ã„æ›ãˆã‚Œã°MapReduceã®å‡¦ç†ã¯ã€å¤§åŸŸãªã©ã®å‡¦ç†ã«å½±éŸ¿ã™ã‚‹å¤–部ã®ç’°å¢ƒã¯æŒãŸãšã€å†…部的ã«ã‚‚é™çš„ãªä¸€æ™‚変数ãªã©ã®çŠ¶æ…‹ã‚‚æŒãŸãªã„ã“ã¨ã‚’æ„味ã—ã¾ã™ã€‚ 純粋ãªé–¢æ•°å‡¦ç†ã¯è¤‡æ•°ã®å‡¦ç†ãŒåŒæ™‚ã«å®Ÿè¡Œã•ã‚Œã¦ã‚‚ä»–ã®ä¸¦åˆ—ã«å‹•ä½œã—ã¦ã„る処ç†ã®çŠ¶æ…‹ã«ã¯å·¦å³ã•ã‚Œãªã„ãŸã‚ã€ã“ã®å‚ç…§é€éŽæ€§ã¯ä¸¦åˆ—化ã«å‘ã„ã¦ã„る性質ãŒã‚ã‚Šã¾
https://jp.techcrunch.com/2015/03/12/20150311google-launches-cloud-storage-nearline-a-low-cost-storage-service-for-cold-data/
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