{"id":1972,"date":"2018-11-30T11:20:10","date_gmt":"2018-11-30T03:20:10","guid":{"rendered":"https:\/\/yanjingang.com\/blog\/?p=1972"},"modified":"2018-12-17T17:17:02","modified_gmt":"2018-12-17T09:17:02","slug":"lsm-vs-b-tree","status":"publish","type":"post","link":"https:\/\/yanjingang.com\/blog\/?p=1972","title":{"rendered":"LSM VS B-Tree"},"content":{"rendered":"

\u5b58\u50a8\u5f15\u64ce\u7c7b\u578b \u529f\u80fd \u5e94\u7528
\nhash \u589e\u5220\u6539\u3001\u968f\u673a\u8bfb\u3001\u987a\u5e8f\u626b\u63cf Key-Value\u5b58\u50a8\u7cfb\u7edf
\nB-Tree \u589e\u5220\u6539\u3001\u968f\u673a\u8bfb\u3001\u987a\u5e8f\u626b\u63cf \u5173\u7cfb\u578b\u6570\u636e\u5e93
\nLSM \u589e\u5220\u6539\u3001\u968f\u673a\u8bfb\u3001\u987a\u5e8f\u626b\u63cf \u5206\u5e03\u5f0f\u5b58\u50a8\u7cfb\u7edf\uff0c\u5982cassandra\u3001google LevelDB<\/p>\n

B-Tree<\/strong>
\n\u7f13\u5b58\u7ba1\u7406<\/p>\n

\u7f13\u5b58\u7ba1\u7406\u7684\u6838\u5fc3\u5728\u4e8e\u7f6e\u6362\u7b97\u6cd5\uff0c\u7f6e\u6362\u7b97\u6cd5\u5e38\u89c1\u7684\u6709FIFO\uff08First In First Out\uff09\uff0cLRU(Least Recently Used)\u3002\u5173\u7cfb\u578b\u6570\u636e\u5e93\u5728LRU\u7684\u57fa\u7840\u4e0a\uff0c\u8fdb\u884c\u4e86\u6539\u8fdb\uff0c\u4e3b\u8981\u4f7f\u7528LIRS(Low Inter-reference Recency Set)
\n\u5c06\u7f13\u5b58\u5206\u4e3a\u4e24\u7ea7\uff0c\u7b2c\u4e00\u6b21\u91c7\u7528LRU\uff0c\u6700\u8fd1\u88ab\u4f7f\u7528\u5230\u7684\u6570\u636e\u4f1a\u8fdb\u7b2c\u4e00\u7ea7\uff0c\u5982\u679c\u6570\u636e\u5728\u8f83\u77ed\u65f6\u95f4\u5185\u88ab\u8bbf\u95ee\u4e86\u4e24\u6b21\u6216\u4ee5\u4e0a\uff0c\u5219\u6210\u4e3a\u70ed\u70b9\u6570\u636e\uff0c\u8fdb\u5165\u7b2c\u4e8c\u7ea7\u3002\u907f\u514d\u4e86\u8fdb\u884c\u5168\u8868\u626b\u63cf\u7684\u65f6\u5019\uff0c\u53ef\u80fd\u4f1a\u5c06\u7f13\u5b58\u4e2d\u7684\u5927\u91cf\u70ed\u70b9\u6570\u636e\u66ff\u6362\u6389\u3002<\/p>\n

LSM<\/strong>
\nLog-Structured Merge Tree:\u7ed3\u6784\u5316\u5408\u5e76\u6811\uff0c\u6838\u5fc3\u601d\u60f3\u5c31\u662f\u4e0d\u5c06\u6570\u636e\u7acb\u5373\u4ece\u5185\u5b58\u4e2d\u5199\u5165\u5230\u78c1\u76d8\uff0c\u800c\u662f\u5148\u4fdd\u5b58\u5728\u5185\u5b58\u4e2d\uff0c\u79ef\u7d2f\u4e86\u4e00\u5b9a\u91cf\u540e\u518d\u5237\u5230\u78c1\u76d8\u4e2d<\/p>\n

LSM VS B-Tree<\/strong>
\nLSM\u5728B-Tree\u7684\u57fa\u7840\u4e0a\u4e3a\u4e86\u83b7\u53d6\u66f4\u597d\u7684\u5199\u6027\u80fd\u800c\u727a\u7272\u4e86\u90e8\u5206\u7684\u8bfb\u6027\u80fd\uff0c\u540c\u65f6\u5229\u7528\u5176\u5b83\u7684\u5b9e\u73b0\u6765\u5f25\u8865\u8bfb\u6027\u80fd\uff0c\u6bd4\u5982boom-filter.<\/p>\n

1.\u5199<\/p>\n

B\u6811\u7684\u5199\u5165\uff0c\u662f\u9996\u5148\u627e\u5230\u5bf9\u5e94\u7684\u5757\u4f4d\u7f6e\uff0c\u7136\u540e\u5c06\u65b0\u6570\u636e\u63d2\u5165\u3002\u968f\u7740\u5199\u5165\u8d8a\u6765\u8d8a\u591a\uff0c\u4e3a\u4e86\u7ef4\u62a4B\u6811\u7ed3\u6784\uff0c\u8282\u70b9\u5f97\u5206\u88c2\u3002\u8fd9\u6837\u63d2\u5165\u6570\u636e\u7684\u968f\u673a\u5199\u6982\u7387\u5c31\u4f1a\u589e\u5927\uff0c\u6027\u80fd\u4f1a\u51cf\u5f31<\/span>\u3002<\/p>\n

LSM \u5219\u662f\u5728\u5185\u5b58\u4e2d\u5f62\u6210\u5c0f\u7684\u6392\u597d\u5e8f\u7684\u6811\uff0c\u7136\u540eflush\u5230\u78c1\u76d8\u7684\u65f6\u5019\u4e0d\u65ad\u7684\u505amerge.\u56e0\u4e3a\u5199\u5165\u90fd\u662f\u5185\u5b58\u5199\uff0c\u4e0d\u5199\u78c1\u76d8\uff0c\u6240\u4ee5\u5199\u4f1a\u5f88\u9ad8\u6548\u3002<\/p>\n

2.\u8bfb<\/p>\n

B\u6811\u4ece\u6839\u8282\u70b9\u5f00\u59cb\u4e8c\u5206\u67e5\u8be2\u76f4\u5230\u53f6\u5b50\u8282\u70b9\uff0c\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u8282\u70b9\uff0c\u5982\u679c\u5bf9\u5e94\u7684\u9875\u9762\u4e0d\u5728\u5185\u5b58\u4e2d\uff0c\u5219\u8bfb\u53d6\u78c1\u76d8\uff0c\u7f13\u5b58\u6570\u636e\u3002<\/p>\n

LSM\u6811\u6574\u4e2a\u7ed3\u6784\u4e0d\u662f\u6709\u5e8f\u7684<\/span>\uff0c\u6240\u4ee5\u4e0d\u77e5\u9053\u6570\u636e\u5728\u4ec0\u4e48\u5730\u65b9\uff0c\u9700\u8981\u4ece\u6bcf\u4e2a\u5c0f\u7684\u6709\u5e8f\u7ed3\u6784\u4e2d\u505a\u4e8c\u5206\u67e5\u8be2\uff0c\u627e\u5230\u4e86\u5c31\u8fd4\u56de\uff0c\u627e\u4e0d\u5230\u5c31\u7ee7\u7eed\u627e\u4e0b\u4e00\u4e2a\u6709\u5e8f\u7ed3\u6784\u3002\u6240\u4ee5\u8bf4LSM\u727a\u7272\u4e86\u8bfb\u6027\u80fd\u3002\u4f46\u662fLSM\u4e4b\u6240\u4ee5\u80fd\u591f\u4f5c\u4e3a\u5927\u89c4\u6a21\u6570\u636e\u5b58\u50a8\u7cfb\u7edf\u5728\u4e8e\u8bfb\u6027\u80fd\u53ef\u4ee5\u901a\u8fc7\u5176\u4ed6\u65b9\u5f0f\u6765\u63d0\u9ad8\uff0c\u6bd4\u5982\u8bfb\u53d6\u6027\u80fd\u66f4\u591a\u7684\u4f9d\u8d56\u4e8e\u5185\u5b58\/\u7f13\u5b58\u547d\u4e2d\u7387<\/span>\u800c\u4e0d\u662f\u78c1\u76d8\u8bfb\u53d6\u3002<\/p>\n

\u6458\u81ea\uff1ahttps:\/\/blog.csdn.net\/fs1360472174\/article\/details\/55056709 <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

LSM\u6811\u6574\u4e2a\u7ed3\u6784\u4e0d\u662f\u6709\u5e8f\u7684\uff0c\u6240\u4ee5\u4e0d\u77e5\u9053\u6570\u636e\u5728\u4ec0\u4e48\u5730\u65b9\uff0c\u9700\u8981\u4ece\u6bcf\u4e2a\u5c0f\u7684\u6709\u5e8f\u7ed3\u6784\u4e2d\u505a\u4e8c\u5206\u67e5\u8be2\uff0c\u627e\u5230\u4e86\u5c31\u8fd4\u56de\uff0c\u627e\u4e0d\u5230\u5c31\u7ee7\u7eed\u627e\u4e0b\u4e00\u4e2a\u6709\u5e8f\u7ed3\u6784\u3002\u6240\u4ee5\u8bf4LSM\u727a\u7272\u4e86\u8bfb\u6027\u80fd\u3002\u4f46\u662fLSM\u4e4b\u6240\u4ee5\u80fd\u591f\u4f5c\u4e3a\u5927\u89c4\u6a21\u6570\u636e\u5b58\u50a8\u7cfb\u7edf\u5728\u4e8e\u8bfb\u6027\u80fd\u53ef\u4ee5\u901a\u8fc7\u5176\u4ed6\u65b9\u5f0f\u6765\u63d0\u9ad8\uff0c\u6bd4\u5982\u8bfb\u53d6\u6027\u80fd\u66f4\u591a\u7684\u4f9d\u8d56\u4e8e\u5185\u5b58\/\u7f13\u5b58\u547d\u4e2d\u7387\u800c\u4e0d\u662f\u78c1\u76d8\u8bfb\u53d6\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[660],"tags":[668,669],"_links":{"self":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1972"}],"collection":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1972"}],"version-history":[{"count":0,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1972\/revisions"}],"wp:attachment":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1972"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1972"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}