Google\u7684\u4e09\u7bc7\u8bba\u6587\u5f71\u54cd\u4e86\u5f88\u591a\u5f88\u591a\u4eba\uff0c\u4e5f\u5f71\u54cd\u4e86\u5f88\u591a\u5f88\u591a\u7cfb\u7edf\u3002\u8fd9\u4e09\u7bc7\u8bba\u6587\u4e00\u76f4\u662f\u5206\u5e03\u5f0f\u9886\u57df\u4f20\u9605\u7684\u7ecf\u5178\u3002\u6839\u636eMapReduce\uff0c\u4e8e\u662f\u6211\u4eec\u6709\u4e86Hadoop\uff1b\u6839\u636eGFS\uff0c\u4e8e\u662f\u6211\u4eec\u6709\u4e86HDFS\uff1b\u6839\u636eBigTable\uff0c\u4e8e\u662f\u6211\u4eec\u6709\u4e86HBase\u3002\u800c\u5728\u8fd9\u4e09\u7bc7\u8bba\u6587\u91cc\u90fd\u63d0\u53caGoogle\u7684\u4e00\u4e2alock service\u2014Chubby\uff0c\u54e6\uff0c\u4e8e\u662f\u6211\u4eec\u6709\u4e86Zookeeper\u3002<\/p>\n
<\/p>\n
\u968f\u7740\u5927\u6570\u636e\u7684\u706b\u70ed\uff0cHxx\u4eec\u5df2\u7ecf\u53d8\u5f97\u8033\u719f\u80fd\u8be6\uff0c\u73b0\u5728\u4f5c\u4e3a\u4e00\u4e2a\u5f00\u53d1\u4eba\u5458\u5982\u679c\u90fd\u4e0d\u77e5\u9053\u8fd9\u51e0\u4e2a\u540d\u8bcd\u51fa\u95e8\u90fd\u597d\u50cf\u4e0d\u597d\u610f\u601d\u8ddf\u4eba\u6253\u62db\u547c\u3002\u4f46\u5b9e\u9645\u4e0a\u5bf9\u6211\u4eec\u8fd9\u4e9b\u975e\u5927\u6570\u636e\u5f00\u53d1\u4eba\u5458\u800c\u8a00\uff0cZookeeper\u662f\u6bd4Hxx\u4eec\u53ef\u80fd\u63a5\u89e6\u5230\u66f4\u591a\u7684\u4e00\u4e2a\u57fa\u7840\u670d\u52a1\u3002\u4f46\u662f\uff0c\u65e0\u5948\u7684\u662f\u5b83\u4e00\u76f4\u9ed8\u9ed8\u7684\u4f4d\u4e8e\u4e8c\u7ebf\uff0c\u4ece\u6765\u6ca1\u6709Hxx\u4eec\u90a3\u4e48\u8000\u773c\u3002\u90a3\u4e48\u5230\u5e95\u4ec0\u4e48\u662fZookeeper\u5462\uff1fZookeeper\u53ef\u4ee5\u7528\u6765\u5e72\u4ec0\u4e48\uff1f\u6211\u4eec\u5c06\u5982\u4f55\u4f7f\u7528Zookeeper\uff1fZookeeper\u53c8\u662f\u600e\u4e48\u5b9e\u73b0\u7684\uff1f<\/p>\n
\u4f34\u968f\u7740Zookeeper\u6709\u4e24\u7bc7\u8bba\u6587\uff1a\u4e00\u7bc7\u662fZab\uff0c\u5c31\u662f\u4ecb\u7ecdZookeeper\u80cc\u540e\u4f7f\u7528\u7684\u4e00\u81f4\u6027\u534f\u8bae\u7684(Zookeeper atomic broadcast protocol)\uff0c\u8fd8\u6709\u4e00\u7bc7\u5c31\u662f\u4ecb\u7ecdZookeeper\u672c\u8eab\u7684\u3002\u5728\u8fd9\u4e24\u7bc7\u8bba\u6587\u91cc\u90fd\u63d0\u5230Zookeeper\u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u534f\u8c03\u670d\u52a1(a service for coordinating processes of distributed applications)\u3002\u90a3\u5206\u5e03\u5f0f\u534f\u8c03\u670d\u52a1\u53c8\u662f\u4e2a\u4ec0\u4e48\u4e1c\u897f\u5462\uff1f\u9996\u5148\u6211\u4eec\u6765\u770b\u201c\u534f\u8c03\u201d\u662f\u4ec0\u4e48\u610f\u601d\u3002<\/p>\n
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public synchronized void sharedMethod(){\r\n\u00a0\u00a0 \/\/\u5bf9\u5171\u4eab\u6570\u636e\u8fdb\u884c\u64cd\u4f5c\r\n}<\/pre>\n\u4f7f\u7528\u4e86\u8fd9\u79cd\u65b9\u5f0f\u540e\uff0c\u591a\u4e2a\u7ebf\u7a0b\u5bf9sharedMethod\u8fdb\u884c\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u534f\u8c03\u597d\u6b65\u9aa4\uff0c\u4e0d\u4f1a\u5bf9sharedMethod\u91cc\u7684\u8d44\u6e90\u8fdb\u884c\u7834\u574f\uff0c\u4ea7\u751f\u4e0d\u4e00\u81f4\u7684\u60c5\u51b5\u3002\u8fd9\u4e2a\u6700\u7b80\u5355\u7684\u534f\u8c03\u65b9\u6cd5\uff0c\u4f46\u6709\u7684\u65f6\u5019\u6211\u4eec\u53ef\u80fd\u9700\u8981\u66f4\u590d\u6742\u7684\u534f\u8c03\u3002\u6bd4\u5982\u6211\u4eec\u5e38\u5e38\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u6211\u4eec\u4f7f\u7528\u8bfb\u5199\u9501\u3002\u56e0\u4e3a\u5927\u90e8\u5206\u65f6\u5019\u6211\u4eec\u5bf9\u8d44\u6e90\u662f\u8bfb\u53d6\u591a\u800c\u4fee\u6539\u5c11\uff0c\u800c\u5982\u679c\u4e0d\u7ba1\u4e09\u4e03\u4e8c\u5341\u4e00\u5168\u90e8\u4f7f\u7528\u6392\u4ed6\u7684\u5199\u9501\uff0c\u90a3\u4e48\u6027\u80fd\u6709\u53ef\u80fd\u5c31\u4f1a\u53d7\u5230\u5f71\u54cd\u3002\u8fd8\u662f\u7528java\u4e3e\u4f8b\uff1a<\/p>\n
public class SharedSource{\r\n\u00a0\u00a0 private ReadWriteLock rwlock = new ReentrantReadWriteLock();\r\n\u00a0\u00a0 private Lock rlock = rwlock.readLock();\r\n\u00a0\u00a0 private Lock wlock = rwlock.writeLock();\r\n\r\n\u00a0\u00a0 public void read(){\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 rlock.lock();\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 try{\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/\u8bfb\u53d6\u8d44\u6e90\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 }finally{\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 rlock.unlock();\r\n\u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0 }\r\n\u00a0 \u00a0\r\n\u00a0\u00a0 public void write(){\r\n\u00a0\u00a0\u00a0\u00a0 wlock.lock();\r\n\u00a0\u00a0\u00a0\u00a0 try{\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/\u5199\u8d44\u6e90\r\n\u00a0\u00a0\u00a0\u00a0 }finally{\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 wlock.unlock();\r\n\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0 }\r\n\r\n}<\/pre>\n\u6211\u4eec\u5728\u8fdb\u7a0b\u5185\u8fd8\u6709\u5404\u79cd\u5404\u6837\u7684\u534f\u8c03\u673a\u5236(\u4e00\u822c\u6211\u4eec\u79f0\u4e4b\u4e3a\u540c\u6b65\u673a\u5236)\u3002\u73b0\u5728\u6211\u4eec\u5927\u6982\u4e86\u89e3\u4e86\u4ec0\u4e48\u662f\u534f\u8c03\u4e86\uff0c\u4f46\u662f\u4e0a\u9762\u4ecb\u7ecd\u7684\u534f\u8c03\u90fd\u662f\u5728\u8fdb\u7a0b\u5185\u8fdb\u884c\u534f\u8c03\u3002\u5728\u8fdb\u7a0b\u5185\u8fdb\u884c\u534f\u8c03\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u8bed\u8a00\uff0c\u5e73\u53f0\uff0c\u64cd\u4f5c\u7cfb\u7edf\u7b49\u4e3a\u6211\u4eec\u63d0\u4f9b\u7684\u673a\u5236\u3002\u90a3\u4e48\u5982\u679c\u6211\u4eec\u5728\u4e00\u4e2a\u5206\u5e03\u5f0f\u73af\u5883\u4e2d\u5462\uff1f\u4e5f\u5c31\u662f\u6211\u4eec\u7684\u7a0b\u5e8f\u8fd0\u884c\u5728\u4e0d\u540c\u7684\u673a\u5668\u4e0a\uff0c\u8fd9\u4e9b\u673a\u5668\u53ef\u80fd\u4f4d\u4e8e\u540c\u4e00\u4e2a\u673a\u67b6\uff0c\u540c\u4e00\u4e2a\u673a\u623f\u53c8\u6216\u4e0d\u540c\u7684\u6570\u636e\u4e2d\u5fc3\u3002\u5728\u8fd9\u6837\u7684\u73af\u5883\u4e2d\uff0c\u6211\u4eec\u8981\u5b9e\u73b0\u534f\u8c03\u8be5\u600e\u4e48\u529e\uff1f\u90a3\u4e48\u8fd9\u5c31\u662f\u5206\u5e03\u5f0f\u534f\u8c03\u670d\u52a1\u8981\u5e72\u7684\u4e8b\u60c5\u3002<\/p>\n
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\u6240\u4ee5\u5206\u5e03\u5f0f\u534f\u8c03\u8fdc\u8fdc\u6bd4\u540c\u4e00\u4e2a\u8fdb\u7a0b\u91cc\u7684\u534f\u8c03\u590d\u6742\u5f97\u591a\uff0c\u6240\u4ee5\u7c7b\u4f3cZookeeper\u8fd9\u7c7b\u57fa\u7840\u670d\u52a1\u5c31\u5e94\u8fd0\u800c\u751f\u3002\u8fd9\u4e9b\u7cfb\u7edf\u90fd\u5728\u5404\u4e2a\u7cfb\u7edf\u4e45\u7ecf\u8003\u9a8c\uff0c\u5b83\u7684\u53ef\u9760\u6027\uff0c\u53ef\u7528\u6027\u90fd\u662f\u7ecf\u8fc7\u7406\u8bba\u548c\u5b9e\u8df5\u7684\u9a8c\u8bc1\u7684\u3002\u6240\u4ee5\u6211\u4eec\u5728\u6784\u5efa\u4e00\u4e9b\u5206\u5e03\u5f0f\u7cfb\u7edf\u7684\u65f6\u5019\uff0c\u5c31\u53ef\u4ee5\u4ee5\u8fd9\u7c7b\u7cfb\u7edf\u4e3a\u8d77\u70b9\u6765\u6784\u5efa\u6211\u4eec\u7684\u7cfb\u7edf\uff0c\u8fd9\u5c06\u8282\u7701\u4e0d\u5c11\u6210\u672c\uff0c\u800c\u4e14bug\u4e5f\u5c06\u66f4\u5c11\u3002<\/p>\n
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<\/p>\n","protected":false},"excerpt":{"rendered":"
Google\u7684\u4e09\u7bc7\u8bba\u6587\u5f71\u54cd\u4e86\u5f88\u591a\u5f88\u591a\u4eba\uff0c\u4e5f\u5f71\u54cd\u4e86\u5f88\u591a\u5f88\u591a\u7cfb\u7edf\u3002\u8fd9\u4e09\u7bc7\u8bba\u6587\u4e00\u76f4\u662f\u5206\u5e03\u5f0f\u9886\u57df\u4f20\u9605\u7684\u7ecf\u5178\u3002\u6839\u636eMapReduce\uff0c\u4e8e\u662f\u6211\u4eec\u6709\u4e86Hadoop\uff1b\u6839\u636eGFS\uff0c\u4e8e\u662f\u6211\u4eec\u6709\u4e86HDFS\uff1b\u6839\u636eBigTable\uff0c\u4e8e\u662f\u6211\u4eec\u6709\u4e86HBase\u3002\u800c\u5728\u8fd9\u4e09\u7bc7\u8bba\u6587\u91cc\u90fd\u63d0\u53caGoogle\u7684\u4e00\u4e2alock service\u2014Chubby\uff0c\u54e6\uff0c\u4e8e\u662f\u6211\u4eec\u6709\u4e86Zookeeper\u3002 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\u4f34\u968f\u7740Zookeeper\u6709\u4e24\u7bc7\u8bba\u6587\uff1a\u4e00\u7bc7\u662fZab\uff0c\u5c31\u662f\u4ecb\u7ecdZookeeper\u80cc\u540e\u4f7f\u7528\u7684\u4e00\u81f4\u6027\u534f\u8bae\u7684(Zookeeper atomic broadcast protocol)\uff0c\u8fd8\u6709\u4e00\u7bc7\u5c31\u662f\u4ecb\u7ecdZookeeper\u672c\u8eab\u7684\u3002\u5728\u8fd9\u4e24\u7bc7\u8bba\u6587\u91cc\u90fd\u63d0\u5230Zookeeper\u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u534f\u8c03\u670d\u52a1(a service for coordinating processes of distributed applications)\u3002\u90a3\u5206\u5e03\u5f0f\u534f\u8c03\u670d\u52a1\u53c8\u662f\u4e2a\u4ec0\u4e48\u4e1c\u897f\u5462\uff1f\u9996\u5148\u6211\u4eec\u6765\u770b\u201c\u534f\u8c03\u201d\u662f\u4ec0\u4e48\u610f\u601d\u3002 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public synchronized void sharedMethod(){ \u00a0\u00a0 \/\/\u5bf9\u5171\u4eab\u6570\u636e\u8fdb\u884c\u64cd\u4f5c } \u4f7f\u7528\u4e86\u8fd9\u79cd\u65b9\u5f0f\u540e\uff0c\u591a\u4e2a\u7ebf\u7a0b\u5bf9sharedMethod\u8fdb\u884c\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u534f\u8c03\u597d\u6b65\u9aa4\uff0c\u4e0d\u4f1a\u5bf9sharedMethod\u91cc\u7684\u8d44\u6e90\u8fdb\u884c\u7834\u574f\uff0c\u4ea7\u751f\u4e0d\u4e00\u81f4\u7684\u60c5\u51b5\u3002\u8fd9\u4e2a\u6700\u7b80\u5355\u7684\u534f\u8c03\u65b9\u6cd5\uff0c\u4f46\u6709\u7684\u65f6\u5019\u6211\u4eec\u53ef\u80fd\u9700\u8981\u66f4\u590d\u6742\u7684\u534f\u8c03\u3002\u6bd4\u5982\u6211\u4eec\u5e38\u5e38\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u6211\u4eec\u4f7f\u7528\u8bfb\u5199\u9501\u3002\u56e0\u4e3a\u5927\u90e8\u5206\u65f6\u5019\u6211\u4eec\u5bf9\u8d44\u6e90\u662f\u8bfb\u53d6\u591a\u800c\u4fee\u6539\u5c11\uff0c\u800c\u5982\u679c\u4e0d\u7ba1\u4e09\u4e03\u4e8c\u5341\u4e00\u5168\u90e8\u4f7f\u7528\u6392\u4ed6\u7684\u5199\u9501\uff0c\u90a3\u4e48\u6027\u80fd\u6709\u53ef\u80fd\u5c31\u4f1a\u53d7\u5230\u5f71\u54cd\u3002\u8fd8\u662f\u7528java\u4e3e\u4f8b\uff1a public class SharedSource{ \u00a0\u00a0 private ReadWriteLock rwlock = new ReentrantReadWriteLock(); \u00a0\u00a0 private Lock rlock = rwlock.readLock(); \u00a0\u00a0 private Lock wlock = rwlock.writeLock(); \u00a0\u00a0 public void read(){ \u00a0\u00a0\u00a0\u00a0\u00a0 rlock.lock(); \u00a0\u00a0\u00a0\u00a0\u00a0 try{ \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-18672","post","type-post","status-publish","format-standard","hentry","category-os"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/18672","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=18672"}],"version-history":[{"count":1,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/18672\/revisions"}],"predecessor-version":[{"id":18673,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/18672\/revisions\/18673"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=18672"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=18672"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=18672"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}