{"id":6343,"date":"2024-07-18T19:38:05","date_gmt":"2024-07-18T11:38:05","guid":{"rendered":"https:\/\/t.n-years.com\/?p=6343"},"modified":"2024-07-18T19:38:05","modified_gmt":"2024-07-18T11:38:05","slug":"redis-redlock-%e7%ae%97%e6%b3%95","status":"publish","type":"post","link":"https:\/\/t.n-years.com\/?p=6343","title":{"rendered":"Redis Redlock \u7b97\u6cd5"},"content":{"rendered":"<p>Redlock \u662f\u7531 Redis \u7684\u4f5c\u8005 Antirez\uff08Salvatore Sanfilippo\uff09\u63d0\u51fa\u7684\u4e00\u79cd\u5206\u5e03\u5f0f\u9501\u5b9e\u73b0\u7b97\u6cd5\uff0c\u65e8\u5728\u89e3\u51b3\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u4f7f\u7528 Redis \u5b9e\u73b0\u53ef\u9760\u5206\u5e03\u5f0f\u9501\u7684\u95ee\u9898\u3002Redlock \u7b97\u6cd5\u901a\u8fc7\u5728\u591a\u4e2a\u72ec\u7acb\u7684 Redis \u5b9e\u4f8b\u4e4b\u95f4\u534f\u8c03\u9501\uff0c\u6765\u63d0\u4f9b\u66f4\u9ad8\u7684\u5b89\u5168\u6027\u548c\u5bb9\u9519\u80fd\u529b\u3002<\/p>\n<h3>Redlock \u7b97\u6cd5\u6982\u8ff0<\/h3>\n<p>Redlock \u7b97\u6cd5\u7684\u6838\u5fc3\u601d\u60f3\u662f\u901a\u8fc7\u5728\u591a\u4e2a Redis \u5b9e\u4f8b\u4e0a\u83b7\u53d6\u9501\uff0c\u4ee5\u786e\u4fdd\u5373\u4f7f\u5176\u4e2d\u90e8\u5206\u5b9e\u4f8b\u53d1\u751f\u6545\u969c\uff0c\u5206\u5e03\u5f0f\u9501\u4f9d\u7136\u662f\u5b89\u5168\u7684\u3002\u5177\u4f53\u5b9e\u73b0\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\n<p><strong>\u83b7\u53d6\u5f53\u524d\u65f6\u95f4<\/strong>\uff1a<\/p>\n<ul>\n<li>\u5728\u5f00\u59cb\u5c1d\u8bd5\u83b7\u53d6\u9501\u4e4b\u524d\uff0c\u8bb0\u5f55\u5f53\u524d\u65f6\u95f4\uff08<code>start_time<\/code>\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4f9d\u6b21\u5c1d\u8bd5\u5728\u591a\u4e2a Redis \u5b9e\u4f8b\u4e0a\u83b7\u53d6\u9501<\/strong>\uff1a<\/p>\n<ul>\n<li>\u6309\u987a\u5e8f\u4f9d\u6b21\u5411\u6bcf\u4e2a Redis \u5b9e\u4f8b\u53d1\u9001 SET \u547d\u4ee4\u5c1d\u8bd5\u83b7\u53d6\u9501\uff0c\u8981\u6c42\u9501\u6709\u76f8\u540c\u7684\u552f\u4e00\u6807\u8bc6\u548c\u8fc7\u671f\u65f6\u95f4\u3002<\/li>\n<li>SET \u547d\u4ee4\u7684\u683c\u5f0f\u4e3a <code>SET key value NX PX expire_time<\/code>\uff0c\u5176\u4e2d <code>NX<\/code> \u8868\u793a\u4ec5\u5f53\u952e\u4e0d\u5b58\u5728\u65f6\u624d\u8bbe\u7f6e\uff0c<code>PX<\/code> \u8868\u793a\u8fc7\u671f\u65f6\u95f4\u5355\u4f4d\u4e3a\u6beb\u79d2\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u8ba1\u7b97\u83b7\u53d6\u9501\u7684\u65f6\u95f4<\/strong>\uff1a<\/p>\n<ul>\n<li>\u5728\u6210\u529f\u83b7\u53d6\u9501\u7684 Redis \u5b9e\u4f8b\u6570\u91cf\u8fbe\u5230\u591a\u6570\uff08\u4f8b\u5982\uff0c3 \u4e2a\u5b9e\u4f8b\u4e2d\u7684\u81f3\u5c11 2 \u4e2a\uff09\u65f6\uff0c\u8ba1\u7b97\u4ece\u5f00\u59cb\u5c1d\u8bd5\u83b7\u53d6\u9501\u5230\u73b0\u5728\u6240\u7528\u7684\u65f6\u95f4\uff08<code>elapsed_time<\/code>\uff09\u3002<\/li>\n<li>\u5982\u679c <code>elapsed_time<\/code> \u5c0f\u4e8e\u9501\u7684\u6709\u6548\u671f\uff0c\u5219\u8ba4\u4e3a\u9501\u83b7\u53d6\u6210\u529f\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u91ca\u653e\u9501<\/strong>\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u9501\u83b7\u53d6\u6210\u529f\uff0c\u5728\u4e1a\u52a1\u64cd\u4f5c\u5b8c\u6210\u540e\uff0c\u9700\u8981\u5728\u6bcf\u4e2a Redis \u5b9e\u4f8b\u4e0a\u91ca\u653e\u9501\u3002<\/li>\n<li>\u91ca\u653e\u9501\u65f6\uff0c\u4f7f\u7528 Lua \u811a\u672c\u786e\u4fdd\u539f\u5b50\u6027\uff0c\u4ec5\u5220\u9664\u6301\u6709\u76f8\u540c\u552f\u4e00\u6807\u8bc6\u7684\u9501\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u9501\u83b7\u53d6\u5931\u8d25\u5904\u7406<\/strong>\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u5728\u591a\u6570\u5b9e\u4f8b\u4e0a\u83b7\u53d6\u9501\u5931\u8d25\uff0c\u6216\u8005\u83b7\u53d6\u9501\u7684\u603b\u65f6\u95f4\u8d85\u8fc7\u9501\u7684\u6709\u6548\u671f\uff0c\u5219\u8ba4\u4e3a\u9501\u83b7\u53d6\u5931\u8d25\uff0c\u5e76\u5728\u6240\u6709\u5b9e\u4f8b\u4e0a\u91ca\u653e\u5df2\u83b7\u53d6\u7684\u9501\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3>Redlock \u7b97\u6cd5\u5b9e\u73b0\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a Redlock \u7b97\u6cd5\u7684 Python \u5b9e\u73b0\u793a\u4f8b\uff0c\u4f7f\u7528 <code>redis-py<\/code> \u5e93\uff1a<\/p>\n<pre><code class=\"language-python\">import time\nimport redis\nimport uuid\n\nclass RedisLock:\n    def __init__(self, instances, lock_key, lock_ttl):\n        self.instances = instances  # Redis\u5b9e\u4f8b\u5217\u8868\n        self.lock_key = lock_key    # \u9501\u7684\u952e\u540d\n        self.lock_ttl = lock_ttl    # \u9501\u7684\u6709\u6548\u671f\uff08\u6beb\u79d2\uff09\n        self.lock_value = str(uuid.uuid4())  # \u9501\u7684\u552f\u4e00\u6807\u8bc6\n\n    def acquire_lock(self):\n        start_time = time.time()  # \u83b7\u53d6\u5f00\u59cb\u65f6\u95f4\n        acquired_instances = []   # \u6210\u529f\u83b7\u53d6\u9501\u7684\u5b9e\u4f8b\u5217\u8868\n\n        for instance in self.instances:\n            if instance.set(self.lock_key, self.lock_value, nx=True, px=self.lock_ttl):\n                acquired_instances.append(instance)\n\n        elapsed_time = (time.time() - start_time) * 1000  # \u8ba1\u7b97\u83b7\u53d6\u9501\u7684\u65f6\u95f4\n\n        # \u68c0\u67e5\u662f\u5426\u5728\u591a\u6570\u5b9e\u4f8b\u4e0a\u6210\u529f\u83b7\u53d6\u9501\n        if len(acquired_instances) &gt;= (len(self.instances) \/\/ 2) + 1 and elapsed_time &lt; self.lock_ttl:\n            return True\n\n        # \u83b7\u53d6\u9501\u5931\u8d25\uff0c\u91ca\u653e\u5df2\u83b7\u53d6\u7684\u9501\n        for instance in acquired_instances:\n            self.release_lock_instance(instance)\n\n        return False\n\n    def release_lock_instance(self, instance):\n        # Lua \u811a\u672c\uff0c\u786e\u4fdd\u4ec5\u91ca\u653e\u6301\u6709\u76f8\u540c\u552f\u4e00\u6807\u8bc6\u7684\u9501\n        script = &quot;&quot;&quot;\n        if redis.call(&quot;get&quot;, KEYS[1]) == ARGV[1] then\n            return redis.call(&quot;del&quot;, KEYS[1])\n        else\n            return 0\n        end\n        &quot;&quot;&quot;\n        instance.eval(script, 1, self.lock_key, self.lock_value)\n\n    def release_lock(self):\n        for instance in self.instances:\n            self.release_lock_instance(instance)\n\n# \u793a\u4f8b\u4f7f\u7528\nif __name__ == &quot;__main__&quot;:\n    redis_instances = [\n        redis.StrictRedis(host=&#039;127.0.0.1&#039;, port=6379, db=0),\n        redis.StrictRedis(host=&#039;127.0.0.1&#039;, port=6380, db=0),\n        redis.StrictRedis(host=&#039;127.0.0.1&#039;, port=6381, db=0)\n    ]\n    lock = RedisLock(redis_instances, &quot;my_lock&quot;, 10000)  # \u9501\u7684\u6709\u6548\u671f\u4e3a 10 \u79d2\n\n    if lock.acquire_lock():\n        try:\n            # \u8fdb\u884c\u4e1a\u52a1\u64cd\u4f5c\n            print(&quot;Lock acquired, processing...&quot;)\n        finally:\n            lock.release_lock()\n            print(&quot;Lock released&quot;)\n    else:\n        print(&quot;Failed to acquire lock&quot;)<\/code><\/pre>\n<h3>Redlock \u7684\u4f18\u70b9<\/h3>\n<ul>\n<li><strong>\u9ad8\u53ef\u7528\u6027<\/strong>\uff1a\u5373\u4f7f\u90e8\u5206 Redis \u5b9e\u4f8b\u6545\u969c\uff0c\u53ea\u8981\u591a\u6570\u5b9e\u4f8b\u53ef\u7528\uff0c\u4ecd\u7136\u53ef\u4ee5\u83b7\u53d6\u548c\u91ca\u653e\u9501\u3002<\/li>\n<li><strong>\u9ad8\u5b89\u5168\u6027<\/strong>\uff1a\u901a\u8fc7\u552f\u4e00\u6807\u8bc6\u548c Lua \u811a\u672c\uff0c\u786e\u4fdd\u9501\u7684\u91ca\u653e\u662f\u539f\u5b50\u7684\uff0c\u4e0d\u4f1a\u8bef\u5220\u5176\u4ed6\u5ba2\u6237\u7aef\u7684\u9501\u3002<\/li>\n<\/ul>\n<h3>Redlock \u7684\u6ce8\u610f\u4e8b\u9879<\/h3>\n<ul>\n<li><strong>\u7f51\u7edc\u5ef6\u8fdf\u548c\u5206\u533a<\/strong>\uff1a\u7531\u4e8e\u7f51\u7edc\u5ef6\u8fdf\u548c\u5206\u533a\u7684\u5f71\u54cd\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u591a\u4e2a\u5ba2\u6237\u7aef\u540c\u65f6\u8ba4\u4e3a\u81ea\u5df1\u83b7\u53d6\u5230\u4e86\u9501\u3002\u56e0\u6b64\uff0c\u9700\u8981\u5408\u7406\u8bbe\u7f6e\u9501\u7684\u6709\u6548\u671f\u548c\u91cd\u8bd5\u673a\u5236\u3002<\/li>\n<li><strong>\u65f6\u949f\u540c\u6b65<\/strong>\uff1aRedis \u5b9e\u4f8b\u7684\u65f6\u949f\u9700\u8981\u5c3d\u91cf\u4fdd\u6301\u540c\u6b65\uff0c\u4ee5\u51cf\u5c11\u65f6\u95f4\u8bef\u5dee\u5e26\u6765\u7684\u9501\u5931\u6548\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u5408\u7406\u4f7f\u7528 Redlock \u7b97\u6cd5\uff0c\u53ef\u4ee5\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u5b9e\u73b0\u53ef\u9760\u7684\u5206\u5e03\u5f0f\u9501\uff0c\u786e\u4fdd\u591a\u8282\u70b9\u73af\u5883\u4e0b\u7684\u64cd\u4f5c\u4e00\u81f4\u6027\u548c\u7cfb\u7edf\u7684\u9ad8\u53ef\u7528\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Redlock \u662f\u7531 Redis \u7684\u4f5c\u8005 Antirez\uff08Salvatore Sanfilippo\uff09\u63d0\u51fa\u7684\u4e00\u79cd&#8230; <\/p>\n<div class=\"read-more navbutton\"><a href=\"https:\/\/t.n-years.com\/?p=6343\">\u9605\u8bfb\u66f4\u591a<i class=\"fa fa-angle-double-right\"><\/i><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[123],"tags":[122],"class_list":["post-6343","post","type-post","status-publish","format-standard","hentry","category-123","tag-redis"],"_links":{"self":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6343","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6343"}],"version-history":[{"count":1,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6343\/revisions"}],"predecessor-version":[{"id":6344,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6343\/revisions\/6344"}],"wp:attachment":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6343"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}