{"id":1814,"date":"2020-07-01T05:50:34","date_gmt":"2020-06-30T21:50:34","guid":{"rendered":"http:\/\/39.97.231.10\/?p=1814"},"modified":"2020-07-01T05:50:34","modified_gmt":"2020-06-30T21:50:34","slug":"hdfs%e8%af%bb%e5%86%99%e6%b5%81%e7%a8%8b","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=1814","title":{"rendered":"HDFS\u8bfb\u5199\u6d41\u7a0b"},"content":{"rendered":"<article class=\\\"_2rhmJa\\\">HDFS \u662f\u4e00\u4e2a\u80fd\u591f\u9762\u5411\u5927\u89c4\u6a21\u6570\u636e\u4f7f\u7528\u7684\uff0c\u53ef\u8fdb\u884c\u6269\u5c55\u7684\u6587\u4ef6\u5b58\u50a8\u4e0e\u4f20\u9012\u7cfb\u7edf\u3002\u662f\u4e00\u79cd\u5141\u8bb8\u6587\u4ef6\u901a\u8fc7\u7f51\u7edc\u5728\u591a\u53f0\u4e3b\u673a\u4e0a\u5206\u4eab\u7684\u6587\u4ef6\u7cfb\u7edf\uff0c\u53ef\u8ba9\u591a\u673a\u5668\u4e0a\u7684\u591a\u7528\u6237\u5206\u4eab\u6587\u4ef6\u548c 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\u800c\u4e0d\u4f1a\u6709\u6570\u636e\u635f\u5931\u3002<\/p>\n<h4>HDFS\u5199\u6d41\u7a0b\uff1a<\/h4>\n<ul>\n<li>1.\u521d\u59cb\u5316FileSystem\uff0c\u5ba2\u6237\u7aef\u8c03\u7528create()\u6765\u521b\u5efa\u6587\u4ef6<\/li>\n<li>2.FileSystem\u7528RPC\u8c03\u7528\u5143\u6570\u636e\u8282\u70b9\uff0c\u5728\u6587\u4ef6\u7cfb\u7edf\u7684\u547d\u540d\u7a7a\u95f4\u4e2d\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6\uff0c\u5143\u6570\u636e\u8282\u70b9\u9996\u5148\u786e\u5b9a\u6587\u4ef6\u539f\u6765\u4e0d\u5b58\u5728\uff0c\u5e76\u4e14\u5ba2\u6237\u7aef\u6709\u521b\u5efa\u6587\u4ef6\u7684\u6743\u9650\uff0c\u7136\u540e\u521b\u5efa\u65b0\u6587\u4ef6\u3002<\/li>\n<li>3.FileSystem\u8fd4\u56deDFSOutputStream\uff0c\u5ba2\u6237\u7aef\u7528\u4e8e\u5199\u6570\u636e\uff0c\u5ba2\u6237\u7aef\u5f00\u59cb\u5199\u5165\u6570\u636e\u3002<\/li>\n<li>4.DFSOutputStream\u5c06\u6570\u636e\u5206\u6210\u5757\uff0c\u5199\u5165data queue\u3002data queue\u7531Data 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src=\\\"https:\/\/upload-images.jianshu.io\/upload_images\/11096896-a32feb1e859dcd91.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/561\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/11096896-a32feb1e859dcd91.png\\\" data-original-width=\\\"561\\\" data-original-height=\\\"345\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"150371\\\" data-image-index=\\\"0\\\" \/><\/div>\n<\/div>\n<div class=\\\"image-caption\\\"><\/div>\n<\/div>\n<\/li>\n<\/ul>\n<h4>HDFS\u8bfb\u6d41\u7a0b\uff1a<\/h4>\n<ul>\n<li>1.\u521d\u59cb\u5316FileSystem\uff0c\u7136\u540e\u5ba2\u6237\u7aef(client)\u7528FileSystem\u7684open()\u51fd\u6570\u6253\u5f00\u6587\u4ef6<\/li>\n<li>2.FileSystem\u7528RPC\u8c03\u7528\u5143\u6570\u636e\u8282\u70b9\uff0c\u5f97\u5230\u6587\u4ef6\u7684\u6570\u636e\u5757\u4fe1\u606f\uff0c\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u6570\u636e\u5757\uff0c\u5143\u6570\u636e\u8282\u70b9\u8fd4\u56de\u4fdd\u5b58\u6570\u636e\u5757\u7684\u6570\u636e\u8282\u70b9\u7684\u5730\u5740\u3002<\/li>\n<li>3.FileSystem\u8fd4\u56deFSDataInputStream\u7ed9\u5ba2\u6237\u7aef\uff0c\u7528\u6765\u8bfb\u53d6\u6570\u636e\uff0c\u5ba2\u6237\u7aef\u8c03\u7528stream\u7684read()\u51fd\u6570\u5f00\u59cb\u8bfb\u53d6\u6570\u636e\u3002<\/li>\n<li>4.DFSInputStream\u8fde\u63a5\u4fdd\u5b58\u6b64\u6587\u4ef6\u7b2c\u4e00\u4e2a\u6570\u636e\u5757\u7684\u6700\u8fd1\u7684\u6570\u636e\u8282\u70b9\uff0cdata\u4ece\u6570\u636e\u8282\u70b9\u8bfb\u5230\u5ba2\u6237\u7aef(client)<\/li>\n<li>5.\u5f53\u6b64\u6570\u636e\u5757\u8bfb\u53d6\u5b8c\u6bd5\u65f6\uff0cDFSInputStream\u5173\u95ed\u548c\u6b64\u6570\u636e\u8282\u70b9\u7684\u8fde\u63a5\uff0c\u7136\u540e\u8fde\u63a5\u6b64\u6587\u4ef6\u4e0b\u4e00\u4e2a\u6570\u636e\u5757\u7684\u6700\u8fd1\u7684\u6570\u636e\u8282\u70b9\u3002<\/li>\n<li>6.\u5f53\u5ba2\u6237\u7aef\u8bfb\u53d6\u5b8c\u6bd5\u6570\u636e\u7684\u65f6\u5019\uff0c\u8c03\u7528FSDataInputStream\u7684close\u51fd\u6570\u3002<\/li>\n<li>7.\u5728\u8bfb\u53d6\u6570\u636e\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5982\u679c\u5ba2\u6237\u7aef\u5728\u4e0e\u6570\u636e\u8282\u70b9\u901a\u4fe1\u51fa\u73b0\u9519\u8bef\uff0c\u5219\u5c1d\u8bd5\u8fde\u63a5\u5305\u542b\u6b64\u6570\u636e\u5757\u7684\u4e0b\u4e00\u4e2a\u6570\u636e\u8282\u70b9\u3002<\/li>\n<\/ul>\n<div class=\\\"image-package\\\">\n<div class=\\\"image-container\\\">\n<div class=\\\"image-container-fill\\\"><\/div>\n<div class=\\\"image-view\\\" data-width=\\\"556\\\" data-height=\\\"339\\\"><img class=\\\"\\\" src=\\\"https:\/\/upload-images.jianshu.io\/upload_images\/11096896-f642dca06447aa05.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/556\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/11096896-f642dca06447aa05.png\\\" data-original-width=\\\"556\\\" data-original-height=\\\"339\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"142496\\\" data-image-index=\\\"1\\\" \/><\/div>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>HDFS 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&raquo;<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[135,118],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"HDFS 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