![\"\"](\"https:\/\/aqzt.com\/wp-content\/uploads\/20220222090802-40.jpg\")
<\/p>\nFlickr.com \u662f\u7f51\u4e0a\u6700\u53d7\u6b22\u8fce\u7684\u7167\u7247\u5171\u4eab\u7f51\u7ad9\u4e4b\u4e00\uff0c\u8fd8\u8bb0\u5f97\u90a3\u4f4d\u7ed9Windows Vista\u62cd\u6444\u58c1\u7eb8\u7684Hamad Darwish\u5417\uff1f\u4ed6\u5c31\u662f\u5c06\u7167\u7247\u4e0a\u4f20\u5230Flickr\uff0c\u540e\u800c\u88ab\u5fae\u8f6f\u770b\u4e2d\u6210\u4e3aVista\u58c1\u7eb8\u5fa1\u7528\u6444\u5f71\u5e08\u3002<\/p>\n<\/p>\n
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\u57282005\u5e74\u6e29\u54e5\u534ePHP\u534f\u4f1a\u7684\u7b80\u62a5\u4ee5\u53ca\u968f\u540e\u7684\u4e00\u7cfb\u5217\u4f1a\u8bae\u4e0a\uff0cFlickr\u7684\u67b6\u6784\u5e08Cal Henderson\u516c\u5f00\u4e86\u5927\u90e8\u5206Flickr\u6240\u4f7f\u7528\u7684\u540e\u53f0\u6280\u672f\uff0c\u4f7f\u5f97\u6211\u4eec\u80fd\u6709\u673a\u4f1a\u6765\u5206\u4eab\u548c\u7814\u7a76\u5176\u5728\u6784\u5efa\u53ef\u6269\u5c55Web\u7ad9\u70b9\u7684\u7ecf\u9a8c\u3002\u672c\u6587\u5927\u90e8\u5206\u8d44\u6599\u6765\u81ea\u4e92\u8054\u7f51\u548c\u81ea\u5df1\u7684\u4e00\u70b9\u70b9\u5fc3\u5f97\uff0c\u6b22\u8fce\u5927\u5bb6\u53c2\u4e0e\u8ba8\u8bba\uff0c\u8981\u662f\u80fd\u591f\u8d77\u5230\u629b\u7816\u5f15\u7389\u7684\u4f5c\u7528\uff0c\u672c\u4eba\u5c06\u4e0d\u80dc\u8363\u5e78\u3002<\/p>\n
Flickr\u6574\u4f53\u6846\u67b6\u56fe<\/p>\n
<\/p>\n
\u5728\u8ba8\u8bbaFlickr \u7f51\u7ad9\u67b6\u6784\u4e4b\u524d\uff0c\u8ba9\u6211\u4eec\u5148\u6765\u770b\u4e00\u7ec4\u7edf\u8ba1\u6570\u636e\uff08\u6570\u636e\u6765\u6e90\uff1aApril 2007 MySQL Conf and Expo\u548cFlickr\u7f51\u7ad9\uff09<\/p>\n
\u8fd9\u5f20\u662fFlickr\u7684\u7f51\u7ad9\u67b6\u6784\u56fe\uff0c\u6211\u4eec\u8fd9\u91cc\u53ea\u4f5c\u4e00\u4e9b\u7b80\u8981\u7684\u63cf\u8ff0\uff0c\u5177\u4f53\u7684\u5206\u6790\u8bf7\u9759\u5f85\u540e\u7eed\u6587\u7ae0\u3002
\n<\/p>\n
\u00a0<\/p>\n
\uff0d \u8fd0\u884cREDHAT LINUX,Apache\u4e0a\u7684PHP\u5e94\u7528\uff0cFlickr\u7f51\u7ad9\u7684\u4e3b\u4f53\u662f\u5927\u7ea66\u4e07\u884cPHP\u4ee3\u7801
\n\uff0d \u6ca1\u6709\u4f7f\u7528PHP session, \u5e94\u7528\u662fstateless,\u4fbf\u4e8e\u6269\u5c55\uff0c\u5e76\u907f\u514dPHP Server\u6545\u969c\u6240\u5e26\u6765\u7684Session\u5931\u6548\u3002
\n\uff0d \u6bcf\u4e2a\u9875\u9762\u6709\u5927\u7ea627\uff5e35\u4e2a\u67e5\u8be2\uff08\u4e0d\u77e5\u9053\u4e3a\u4ec0\u4e48\u8fd9\u4e48\u8bbe\u8ba1\uff0c\u4e2a\u4eba\u89c9\u5f97\u6ca1\u6709\u5fc5\u8981\uff09
\n\uff0d \u53e6\u6709\u4e13\u95e8\u7684Apache Web Farm \u670d\u52a1\u4e8e\u9759\u6001\u6587\u4ef6\uff08HTML\u548c\u7167\u7247\uff09\u7684\u8bbf\u95ee<\/p>\n
\uff0d MySQL \u6570\u636e\u5e93\uff0c\u5b58\u653e\u7528\u6237\u8868\uff0c\u8bb0\u5f55\u7684\u4fe1\u606f\u662f\u7528\u6237\u4e3b\u952e\u4ee5\u53ca\u6b64\u7528\u6237\u5bf9\u4ee5\u7684\u6570\u636e\u5e93Shard\u533a\uff0c\u4ece\u4e2d\u5fc3\u7528\u6237\u8868\u4e2d\u67e5\u51fa\u7528\u6237\u6570\u636e\u6240\u5728\u4f4d\u7f6e\uff0c\u7136\u540e\u76f4\u63a5\u4ece\u76ee\u6807Shard\u4e2d\u53d6\u51fa\u6570\u636e\u3002\u00a0
\n\uff0d \u201cDual Tree"\u67b6\u6784\u662f\u201dMaster\uff0dMaster"\u548c\u201cMaster-Slave"\u7684\u6709\u6548\u7ed3\u5408\uff0c\u53ccMaster \u907f\u514d\u4e86\u201c\u5355\u70b9\u6545\u969c\u201d\uff0cMaster\uff0dSlave\u53c8\u63d0\u9ad8\u4e86\u8bfb\u53d6\u901f\u5ea6\uff0c\u56e0\u4e3a\u7528\u6237\u8868\u7684\u64cd\u4f5c90\uff05\u4ee5\u4e0a\u662f\u8bfb\u3002<\/p>\n
\uff0d MySQL \u6570\u636e\u5e93\uff0c\u5b58\u50a8\u5b9e\u9645\u7684\u7528\u6237\u6570\u636e\u548c\u7167\u7247\u7684\u5143\u6570\u636e\uff08Meta Data)\uff0c\u6bcf\u4e2aShard \u5927\u7ea640\u4e07\u4e2a\u7528\u6237\uff0c120GB \u6570\u636e\u3002\u6bcf\u4e2a\u7528\u6237\u7684\u6240\u6709\u6570\u636e\u5b58\u653e\u5728\u540c\u4e00\u4e2ashard\u4e2d\u3002
\n\uff0d Shard\u4e2d\u7684\u6bcf\u4e00\u4e2aserver\u7684\u8d1f\u8f7d\u53ea\u662f\u5176\u53ef\u6700\u5927\u8d1f\u8f7d\u768450\uff05\uff0c\u8fd9\u6837\u5728\u9700\u8981\u7684\u65f6\u5019\u53ef\u4ee5Online\u505c\u6389\u4e00\u534a\u7684server\u8fdb\u884c\u5347\u7ea7\u6216\u7ef4\u62a4\u800c\u4e0d\u5f71\u54cd\u7cfb\u7edf\u6027\u80fd\u3002
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\uff09<\/li>\n<\/ul>\n166 DB servers, 244 web servers(\u4e0d\u77e5\u9053\u662f\u5426\u5305\u62ec squid server\uff1f), 14 Memcached servers<\/p>\n
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\u6700\u7ec8\uff0cFlickr\u91c7\u7528\u4e86\u4e00\u79cd\u975e\u5e38\u201c\u8f7b\u91cf\u201d\u4f46\u6709\u6548\u7684\u201c\u7b80\u6613\u201dPHP\u5b9e\u73b0\uff0c\u57fa\u672c\u7684\u4ee3\u7801\u53ea\u670910\u51e0\u884c\uff1a<\/p>\n \u201cMaster\u201d-"Slave"\u6a21\u5f0f\u7684\u7f3a\u70b9\u662f\u5b83\u5e76\u6ca1\u6709\u5bf9\u4e8e\u201c\u5199'\u64cd\u4f5c\u63d0\u4f9b\u6269\u5c55\u80fd\u529b\uff0c\u800c\u4e14\u5b58\u5728\u5355\u70b9\u6545\u969c\uff0c\u5373\u4e00\u65e6Master\u6545\u969c\uff0c\u6574\u4e2a\u7f51\u7ad9\u5c06\u4e27\u5931\u201c\u66f4\u65b0\u201d \u7684\u80fd\u529b\u3002\u89e3\u51b3\u7684\u529e\u6cd5\u91c7\u7528\u201cMaster"-"Master"\u6a21\u5f0f\uff0c\u5373\u4e24\u53f0\u670d\u52a1\u5668\u4e92\u4e3a\u201dMaster\u201c-"Slave",\u8fd9\u6837\u4e0d\u4ec5\u201d\u8bfb\/\u5199\u201c\u80fd\u529b\u6269\u5c55\u4e86\u4e00 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\n\u5220\u9664\u7684\u6570\u91cf\uff0c\u6bd4\u4f8b\u8fbe\u5230\u4e86\u5927\u7ea613\uff1a1\u751a\u81f3\u66f4\u591a\uff0c\u6240\u4ee5\u4ed6\u4eec\u91c7\u7528\u4e86\u201cMaster-Slave\u201d\u7684\u590d\u5236\u6a21\u5f0f\uff0c\u5373\u6240\u6709\u7684\u201c\u5199\u201d\u64cd\u4f5c\u90fd\u5728\u53d1\u751f\u5728\u201cMaster"\uff0c \u7136\u540e\u201d\u5f02\u6b65\u201c\u590d\u5236\u5230\u4e00\u53f0\u6216\u591a\u53f0\u201cSlave"\u4e0a\uff0c\u800c\u6240\u6709\u7684\u201d\u8bfb\u201c\u64cd\u4f5c\u90fd\u8f6c\u5230\u201dSlave"\u4e0a\u8fd0\u884c\uff0c\u8fd9\u6837\u968f\u7740\u201c\u8bfb\u201d\u4ea4\u6613\u91cf\u7684\u589e\u52a0\uff0c\u53ea\u9700\u589e\u52a0Slave\u670d\u52a1\u5668 \u5c31\u53ef\u4ee5\u4e86\u3002\u00a0\u00a0\u00a0
\n
\n\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u5e94\u7528\u7cfb\u7edf\u5e94\u8be5\u5982\u4f55\u4fee\u6539\u6765\u9002\u5e94\u8fd9\u6837\u7684\u67b6\u6784\uff0c\u9664\u4e86\u201d\u8bfb\/\u5199\u201c\u5206\u79bb\u5916\uff0c\u5bf9\u4e8e\u201d\u8bfb\u201c\u64cd\u4f5c\u6700\u57fa\u672c\u7684\u8981\u6c42\u662f\uff1a1\uff09\u5e94\u7528\u7a0b\u5e8f\u80fd\u591f\u5728\u591a\u4e2a\u201dSlave\u201c\u4e0a\u8fdb \u884c\u8d1f\u8f7d\u5747\u5206\uff1b2\uff09\u5f53\u4e00\u4e2a\u6216\u591a\u4e2a\u201dslave"\u51fa\u73b0\u6545\u969c\u65f6\uff0c\u5e94\u7528\u7a0b\u5e8f\u80fd\u81ea\u52a8\u5c1d\u8bd5\u4e0b\u4e00\u4e2a\u201cslave\u201d\uff0c\u5982\u679c\u5168\u90e8\u201cSlave"\u5931\u6548\uff0c\u5219\u8fd4\u56de\u9519\u8bef\u3002 Flickr\u66fe\u7ecf\u8003\u8651\u8fc7\u7684\u65b9\u6848\u662f\u5728Web\u5e94\u7528\u548c\u201dSlave\u201c\u7fa4\u4e4b\u95f4\u52a0\u5165\u4e00\u4e2a\u786c\u4ef6\u6216\u8f6f\u4ef6\u7684\u201dLoad Balancer\u201c\uff0c\u5982\u4e0b\u56fe
\n
\n\u8fd9\u6837\u7684\u597d\u5904\u662f\u5e94\u7528\u6240\u9700\u7684\u6539\u52a8\u6700\u5c0f\uff0c\u56e0\u4e3a\u5bf9\u4e8e\u5e94\u7528\u6765\u8bf4\uff0c\u6240\u6709\u7684\u8bfb\u64cd\u4f5c\u90fd\u662f\u901a\u8fc7\u4e00\u4e2a\u865a\u62df\u7684Slave\u6765\u8fdb\u884c\uff0c\u6dfb\u52a0\u548c\u5220\u9664\u201cSlave"\u670d\u52a1\u5668\u5bf9\u5e94\u7528\u900f \u660e\uff0cLoad Balancer \u5b9e\u73b0\u5bf9\u5404\u4e2aSlave\u670d\u52a1\u5668\u72b6\u6001\u7684\u76d1\u63a7\u5e76\u5c06\u51fa\u73b0\u6545\u969c\u7684Slave\u4ece\u53ef\u7528\u8282\u70b9\u5217\u8868\u91cc\u5220\u9664\uff0c\u5e76\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e9b\u590d\u6742\u7684\u8d1f\u8f7d\u5206\u62c5\u7b56\u7565\uff0c\u6bd4\u5982\u65b0\u4e70\u7684\u670d\u52a1\u5668\u5904\u7406\u80fd\u529b\u8981\u9ad8 \u8fc7Slave\u7fa4\u4e2d\u5176\u4ed6\u7684\u8001\u673a\u5668\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u7ed9\u8fd9\u4e2a\u673a\u5668\u591a\u5206\u914d\u4e00\u4e9b\u8d1f\u8f7d\u4ee5\u6700\u6709\u6548\u7684\u5229\u7528\u8d44\u6e90\u3002\u4e00\u4e2a\u7b80\u5355\u7684\u5229\u7528Apache proxy_balancer_module\u7684\u4f8b\u5b50\u5982\u4e0b\uff1a**
\n**<\/p>\n
\n\n\n
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<\/div><\/td>1\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002
\n2
\n3
\n4
\n5
\n6
\n7 LoadModule proxy_module modules\/mod_proxy.so
\n8
\n9
\n10
\n11
\n12
\n13 LoadModule proxy_balancer_module modules\/mod_proxy_balancer.so
\n14
\n15
\n16
\n17
\n18
\n19 LoadModule proxy_http_module modules\/mod_proxy_http.so
\n20
\n21
\n22
\n23
\n24
\n25 \u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002\u3002
\n26
\n27
\n28
\n29
\n30
\n31 <Proxy balancer:\/\/mycluster>
\n32
\n33
\n34
\n35
\n36
\n37 BalancerMember "http:\/\/slave1:8008\/App"\u00a0\u00a0 loadfactor=4
\n38
\n39
\n40
\n41
\n42
\n43 BalancerMember "http:\/\/slave2:8008\/App"\u00a0\u00a0 loadfactor=3
\n44
\n45
\n46
\n47
\n48
\n49 BalancerMember "http:\/\/slave3:8008\/App"\u00a0\u00a0 loadfactor=3
\n50
\n51
\n52
\n53
\n54
\n55 ....................
\n56
\n57
\n58
\n59
\n60
\n61 \/\/\/slave load ratio 4:3:3.
\n62<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n\n\n
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<\/div><\/td>1function
\n2 db_connect(
\n3 $hosts
\n4 ,
\n5 $user
\n6 ,
\n7 $pass
\n8 ){
\n9
\n10
\n11
\n12
\n13
\n14 shuffle(
\n15 $hosts
\n16 );\u00a0\u00a0\u00a0\u00a0
\n17 \/\/shuffle()\u662fPHP\u51fd\u6570\uff0c\u4f5c\u7528\u662f\u5c06\u6570\u7ec4\u4e2d\u6bcf\u4e2a\u5143\u7d20\u7684\u987a\u5e8f\u968f\u673a\u6253\u4e71\u3002
\n18
\n19
\n20
\n21
\n22
\n23 foreach
\n24 (
\n25 $hosts
\n26 as
\n27 $host
\n28 ){
\n29
\n30
\n31
\n32
\n33
\n34 debug(
\n35 "Trying to connect to $host..."
\n36 );
\n37
\n38
\n39
\n40
\n41
\n42 $dbh
\n43 = @mysql_connect(
\n44 $host
\n45 ,
\n46 $user
\n47 ,
\n48 $pass
\n49 , 1);
\n50
\n51
\n52
\n53
\n54
\n55 if
\n56 (
\n57 $dbh
\n58 ){
\n59
\n60
\n61
\n62
\n63
\n64 debug(
\n65 "Connected to $host!"
\n66 );
\n67
\n68
\n69
\n70
\n71
\n72 return
\n73 $dbh
\n74 ;
\n75
\n76
\n77
\n78
\n79
\n80 }
\n81
\n82
\n83
\n84
\n85
\n86 debug(
\n87 "Failed to connect to $host!"
\n88 );
\n89
\n90
\n91
\n92
\n93
\n94 }
\n95
\n96
\n97
\n98
\n99
\n100 debug(
\n101 "Failed to connect to all hosts in list - giving up!"
\n102 );
\n103
\n104
\n105
\n106
\n107
\n108 return
\n109 0;
\n110
\n111
\n112
\n113
\n114
\n115 }
\n116<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n\n\n
1
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<\/div><\/td>1 \u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u5982\u679c\u9700\u8981\u5bf9\u7279\u5b9a\u7684Slave\u8d4b\u4e88\u66f4\u9ad8\u7684\u8d1f\u8f7d\uff0c\u53ea\u8981\u5728$hosts\u4e2d\u591a\u51fa\u73b0\u4e00\u6b21\u6216\u591a\u6b21\u5c31\u53ef\u4ee5\u4e86\u3002\u8fd9\u6bb5\u4ee3\u7801\u53ea\u8981\u7a0d\u7a0d\u6539\u8fdb\uff0c\u5c31\u53ef\u4ee5\u5b9e\u73b0\u66f4\u590d\u6742\u7684\u529f\u80fd\uff0c\u5982\u5f53connect\u5931\u8d25\u65f6\u81ea\u52a8\u5c06host\u4ecehosts\u5217\u8868\u4e2d\u53bb\u9664\u7b49\u3002
\n2<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n\u3002
\n\u201c\u53cc\u6811\u201d\u67b6\u6784\u5e76\u6ca1\u6709\u652f\u6491\u592a\u4e45\u7684\u65f6\u95f4\uff0c\u5927\u69826\u4e2a\u6708\u540e\uff0c\u968f\u7740\u7528\u6237\u7684\u6fc0\u589e\uff0c\u7cfb\u7edf\u518d\u4e00\u6b21\u8fbe\u5230\u4e86\u6781\u9650\uff0c\u4e0d\u4ec5\u201d\u5199\u201d\u64cd\u4f5c\u6210\u4e3a\u4e86\u74f6\u9888\uff0c\u800c\u4e14\u201c\u5f02\u6b65\u590d\u5236"\u4e5f\u7531\u4e8e \u201dSlave\u201c\u670d\u52a1\u5668\u8fc7\u4e8e\u7e41\u5fd9\u800c\u51fa\u73b0\u4e86\u4e25\u91cd\u7684\u6ede\u540e\u800c\u9020\u6210\u8bfb\u6570\u636e\u7684\u4e0d\u4e00\u81f4\u3002\u90a3\u4e48\uff0c\u80fd\u4e0d\u80fd\u5728\u73b0\u6709\u67b6\u6784\u52a0\u4ee5\u89e3\u51b3\uff0c\u6bd4\u5982\u8bf4\u589e\u52a0\u65b0\u7684\u201dMaster\u201c\u670d\u52a1\u5668\u548c\u8003\u8651\u91c7 \u7528\u201d\u540c\u6b65\u590d\u5236\u201c\u5462\uff1f\u7b54\u6848\u662f\u5426\u5b9a\u7684\uff0c\u5728Master\u8d85\u8fc7\u4e24\u53f0\u7684\u8bbe\u7f6e\u4e2d\uff0c\u53ea\u80fd\u91c7\u7528\u201d\u95ed\u73af\u94fe\u201c\u7684\u65b9\u5f0f\u8fdb\u884c\u590d\u5236\uff0c\u5728\u5927\u6570\u636e\u91cf\u7684\u751f\u4ea7\u73af\u5883\u4e2d\uff0c\u5f88\u5bb9\u6613\u9020\u6210\u5728\u4efb\u610f\u65f6\u523b\u6ca1 \u6709\u4e00\u4e2aMaster\u6216Slave\u8282\u70b9\u662f\u5177\u6709\u5168\u90e8\u6700\u65b0\u6570\u636e\u7684\uff08\u6709\u70b9\u7c7b\u4f3c\u4e8e\u201d\u4eba\u4e00\u6b21\u4e5f\u4e0d\u80fd\u8e0f\u8fdb\u540c\u4e00\u6761\u6cb3\u201c\uff1f\uff09\uff0c\u8fd9\u6837\u5f88\u96be\u4fdd\u969c\u6570\u636e\u7684\u4e00\u81f4\u6027\uff0c\u800c\u4e14\u4e00\u65e6\u5176\u4e2d\u4e00\u4e2aMaster\u51fa\u73b0\u6545\u969c\uff0c\u5c06\u4e2d\u65ad\u6574\u4e2a\u590d\u5236\u94fe\uff1b\u800c\u5bf9\u4e8e\u201d\u540c\u6b65\u590d\u5236\u201c\uff0c\u5f53\u7136\u8fd9\u662f\u6d88\u9664\u201d\u590d\u5236\u6ede\u540e\u201c\u7684\u6700\u597d\u529e\u6cd5\uff0c\u4e0d\u8fc7\u5728\u5f53\u65f6MySQL\u7684\u540c\u6b65\u590d\u5236\u8fd8\u8fdc\u6ca1\u6709\u6210\u719f\u5230\u53ef\u4ee5\u8fd0\u7528\u5728\u6295\u4ea7\u73af\u5883\u4e2d\u3002<\/p>\n
\nShard\u4e3b\u8981\u662f\u4e3a\u4e86\u89e3\u51b3\u4f20\u7edf\u6570\u636e\u5e93Master\/Slave\u6a21\u5f0f\u4e0b\u5355\u4e00Master\u6570\u636e\u5e93\u7684\u201c\u5199\u201d\u74f6\u9888\u800c\u51fa\u73b0\u7684\uff0c\u7b80\u5355\u7684\u8bf4Shard\u5c31\u662f\u5c06\u4e00\u4e2a\u5927\u8868\u5206 \u5272\u6210\u591a\u4e2a\u5c0f\u8868\uff0c\u6bcf\u4e2a\u5c0f\u8868\u5b58\u50a8\u5728\u4e0d\u540c\u673a\u5668\u7684\u6570\u636e\u5e93\u4e0a\uff0c\u4ece\u800c\u5c06\u8d1f\u8f7d\u5206\u6563\u5230\u591a\u4e2a\u673a\u5668\u5e76\u884c\u5904\u7406\u800c\u6781\u5927\u7684\u63d0\u9ad8\u6574\u4e2a\u7cfb\u7edf\u7684\u201c\u5199\u201d\u6269\u5c55\u80fd\u529b\u3002\u76f8\u6bd4\u4f20\u7edf\u65b9\u5f0f\uff0c\u7531\u4e8e\u6bcf\u4e2a\u6570\u636e \u5e93\u90fd\u76f8\u5bf9\u8f83\u5c0f\uff0c\u4e0d\u4ec5\u8bfb\u5199\u64cd\u4f5c\u66f4\u5feb\uff0c\u751a\u81f3\u53ef\u4ee5\u5c06\u6574\u4e2a\u5c0f\u6570\u636e\u5e93\u7f13\u5b58\u5230\u5185\u5b58\u4e2d\uff0c\u800c\u4e14\u6bcf\u4e2a\u5c0f\u6570\u636e\u5e93\u7684\u5907\u4efd\uff0c\u6062\u590d\u4e5f\u53d8\u5f97\u76f8\u5bf9\u5bb9\u6613\uff0c\u540c\u65f6\u7531\u4e8e\u5206\u6563\u4e86\u98ce\u9669\uff0c\u5355\u4e2a\u5c0f\u6570\u636e\u5e93 \u7684\u6545\u969c\u4e0d\u4f1a\u5f71\u54cd\u5176\u4ed6\u7684\u6570\u636e\u5e93\uff0c\u4f7f\u6574\u4e2a\u7cfb\u7edf\u7684\u53ef\u9760\u6027\u4e5f\u5f97\u5230\u4e86\u663e\u8457\u7684\u63d0\u9ad8\u3002
\n\u5bf9\u4e8e\u5927\u591a\u6570\u7f51\u7ad9\u6765\u8bf4\uff0c\u4ee5\u7528\u6237\u4e3a\u5355\u4f4d\u8fdb\u884cShard\u5206\u5272\u662f\u6700\u5408\u9002\u4e0d\u8fc7\u7684\uff0c\u5e38\u89c1\u7684\u5206\u5272\u65b9\u6cd5\u6709\u6309\u5730\u57df\uff08\u6bd4\u5982\u90ae\u7f16\uff09\uff0c\u6309Key\u503c\uff08\u6bd4\u5982Hash\u7528\u6237ID),\u8fd9\u4e9b \u65b9\u6cd5\u53ef\u4ee5\u7b80\u5355\u7684\u901a\u8fc7\u5e94\u7528\u914d\u7f6e\u6587\u4ef6\u6216\u7b97\u6cd5\u6765\u5b9e\u73b0\uff0c\u4e00\u822c\u4e0d\u9700\u8981\u53e6\u5916\u7684\u6570\u636e\u5e93\uff0c\u7f3a\u70b9\u662f\u4e00\u65e6\u4e1a\u52a1\u589e\u52a0\uff0c\u9700\u8981\u518d\u6b21\u5206\u5272Shard\u65f6\u8981\u4fee\u6539\u73b0\u6709\u7684\u5e94\u7528\u7b97\u6cd5\u548c\u91cd\u65b0\u8ba1\u7b97\u6240 \u6709\u7684Shard KEY\u503c\uff1b\u800c\u6700\u4e3a\u7075\u6d3b\u7684\u505a\u6cd5\u662f\u4ee5\u201c\u76ee\u5f55\u201d\u670d\u52a1\u4e3a\u57fa\u7840\u7684\u5206\u5272\uff0c\u5373\u5728Shard\u4e4b\u524d\u52a0\u4e00\u4e2a\u4e2d\u592e\u6570\u636e\u5e93\uff08Global Lookup Cluster\uff09\uff0c\u5e94\u7528\u8981\u5148\u6839\u636e\u7528\u6237\u4e3b\u952e\u503c\u67e5\u8be2\u4e2d\u592e\u6570\u636e\u5e93\uff0c\u83b7\u5f97\u7528\u6237\u6570\u636e\u6240\u5728\u7684Shard\uff0c\u968f\u540e\u7684\u64cd\u4f5c\u518d\u8f6c\u5411Shard\u6240\u5728\u6570\u636e\u5e93\uff0c\u4f8b\u5982\u4e0b\u56fe\uff1a<\/p>\n<\/p>\n\n\n
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<\/div><\/td>1string
\n2 connectionString =
\n3 @"Driver={MySQL};SERVER=dbserver;DATABASE=CustomerDB;"
\n4 ;\u00a0\u00a0\u00a0\u00a0\u00a0
\n5
\n6
\n7
\n8
\n9
\n10 OdbcConnection conn =
\n11 new
\n12 OdbcConnection(connectionString);
\n13
\n14
\n15
\n16
\n17
\n18 conn.Open();
\n19<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n\n\n
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<\/div><\/td>1 \u53d8\u4e3a\uff1a
\n2<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n\n\n
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<\/div><\/td>1string
\n2 connectionString = GetDatabaseFor(customerId);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0
\n3
\n4
\n5
\n6
\n7
\n8 OdbcConnection conn =
\n9 new
\n10 OdbcConnection(connectionString);
\n11
\n12
\n13
\n14
\n15
\n16 conn.Open();
\n17<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n\n\n
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<\/div><\/td>1 GetDatabaseFor()\u51fd\u6570\u5b8c\u6210\u6839\u636e\u7528\u6237ID\u83b7\u53d6Shard connectionString\u7684\u4f5c\u7528\u3002
\n2<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n
\nDual Tree Central Database\u5c31\u662f\u4e2d\u592e\u6570\u636e\u5e93\uff0c\u5b58\u653e\u7528\u6237\u8868\uff0c\u8bb0\u5f55\u7684\u4fe1\u606f\u662f\u7528\u6237\u4e3b\u952e\u4ee5\u53ca\u6b64\u7528\u6237\u5bf9\u4ee5\u7684\u6570\u636e\u5e93Shard\u533a\uff1b\u800cMaster-Master Shards\u5c31\u662f\u4e00\u4e2a\u4e2a\u7684Shard\u7528\u6237\u6570\u636e\u5e93\uff0c\u5b58\u50a8\u5b9e\u9645\u7684\u7528\u6237\u6570\u636e\u548c\u7167\u7247\u7684\u5143\u6570\u636e\uff08Meta Data)\u3002<\/p>\n
\nMemecached\u662f\u4e00\u4e2a\u9ad8\u6027\u80fd\u7684\uff0c\u5206\u5e03\u5f0f\u7684\uff0c\u5f00\u6e90\u7684\u5185\u5b58\u5bf9\u8c61\u7f13\u5b58\u7cfb\u7edf\uff0c\u987e\u540d\u601d\u4e49\uff0c\u5b83\u7684\u4e3b\u8981\u76ee\u7684\u662f\u5c06\u7ecf\u5e38\u8bfb\u53d6\u7684\u5bf9\u8c61\u653e\u5165\u5185\u5b58\u4ee5\u63d0\u9ad8\u6574\u4e2a\u7cfb\u7edf\uff0c\u5c24\u5176\u662f\u6570 \u636e\u5e93\u7684\u6269\u5c55\u80fd\u529b\u3002Memcached\u7684\u4e3b\u8981\u7ed3\u6784\u662f\u4e24\u4e2aHash Table,Server\u7aef\u7684HashTable\u4ee5key-value pair\u7684\u65b9\u5f0f\u5b58\u653e\u5bf9\u8c61\u503c\uff0c\u800cClient\u7aef\u7684HashTable\u7684\u5219\u51b3\u5b9a\u67d0\u4e00\u5bf9\u8c61\u5b58\u653e\u5728\u54ea\u4e00\u4e2aMemcached Server.\u4e3e\u4e2a\u4f8b\u5b50\u8bf4\uff0c\u540e\u53f0\u6709\uff13\u4e2aMemecached Server,A\u3001B\u3001C,Client1\u9700\u8981\u5c06\u4e00\u4e2a\u5bf9\u8c61\u540d\u4e3a\u201duserid123456\u201c\uff0c\u503c\u4e3a\u201c\u9c81\u4e01"\u7684\u5b58\u5165\uff0c\u7ecf\u8fc7Client1\u7684Hash\u8ba1 \u7b97\uff0c"userid123456"\u7684\u503c\u5e94\u8be5\u653e\u5165Memcached ServerB, \u800c\u8fd9\u4e4b\u540e\uff0cClient2\u9700\u8981\u8bfb\u53d6"userid123456"\u7684\u503c\uff0c\u7ecf\u8fc7\u540c\u6837\u7684Hash\u8ba1\u7b97\uff0c\u5f97\u51fa"userid123456"\u7684\u503c\u5982\u679c\u5b58\u5728\u7684\u8bdd\u5e94\u8be5\u5728 Memcached ServerB\uff0c\u5e76\u4ece\u4e2d\u53d6\u51fa\u3002\u6700\u5999\u7684\u662fServer\u4e4b\u95f4\u5f7c\u6b64\u662f\u5b8c\u5168\u72ec\u7acb\u7684\uff0c\u5b8c\u5168\u4e0d\u77e5\u9053\u5bf9\u65b9\u7684\u5b58\u5728\uff0c\u6ca1\u6709\u4e00\u4e2a\u7c7b\u4f3c\u4e0eMaster\u6216Admin Server\u7684\u5b58\u5728\uff0c\u589e\u52a0\u548c\u51cf\u5c11Server\u53ea\u9700\u5728Client\u7aef"\u6ce8\u518c"\u5e76\u91cd\u65b0Hash\u5c31\u53ef\u4ee5\u4e86\u3002
\nMemcached\u4f5c\u4e3a\u6570\u636e\u5e93\u7f13\u5b58\u7684\u4f5c\u7528\u4e3b\u8981\u5728\u4e8e\u51cf\u8f7b\u751a\u81f3\u6d88\u9664\u9ad8\u8d1f\u8f7d\u6570\u636e\u5e93\u60c5\u51b5\u4e0b\u9891\u7e41\u8bfb\u53d6\u6240\u5e26\u6765\u7684Disk I\/O\u74f6\u9888\uff0c\u76f8\u5bf9\u4e8e\u6570\u636e\u5e93\u81ea\u8eab\u7684\u7f13\u5b58\u6765\u8bf4\uff0c\u5177\u6709\u4ee5\u4e0b\u4f18\u70b9\uff1a\uff11\uff09Memecached\u7684\u7f13\u5b58\u662f\u5206\u5e03\u5f0f\u7684\uff0c\u800c\u6570\u636e\u5e93\u7684\u7f13\u5b58\u53ea\u9650\u4e8e\u672c\u673a\uff1b\uff12\uff09Memcached \u7f13\u5b58\u7684\u662f\u5bf9\u8c61\uff0c\u53ef\u4ee5\u662f\u7ecf\u8fc7\u590d\u6742\u8fd0\u7b97\u548c\u67e5\u8be2\u7684\u6700\u7ec8\u7ed3\u679c\uff0c\u5e76\u4e14\u4e0d\u9650\u4e8e\u6570\u636e\uff0c\u53ef\u4ee5\u662f\u4efb\u4f55\u5c0f\u4e8e\uff11MB\u7684\u5bf9\u8c61\uff0c\u6bd4\u5982html\u6587\u4ef6\u7b49\uff1b\u800c\u6570\u636e\u5e93\u7f13\u5b58\u662f\u4ee5"row"\u4e3a\u5355 \u4f4d\u7684\uff0c\u4e00\u65e6"row"\u4e2d\u7684\u4efb\u4f55\u6570\u636e\u66f4\u65b0\uff0c\u6574\u4e2a\u201crow"\u5c06\u8fdb\u884c\u53ef\u80fd\u662f\u5bf9\u5e94\u7528\u6765\u8bf4\u4e0d\u5fc5\u8981\u7684\u66f4\u65b0\uff1b\uff13\uff09Memcached\u7684\u5b58\u53d6\u662f\u8f7b\u91cf\u7684\uff0c\u800c\u6570\u636e\u5e93\u7684\u5219\u76f8\u5bf9\u8f83 \u91cd\uff0c\u5728\u4f4e\u8d1f\u8f7d\u7684\u60c5\u51b5\u4e0b\uff0c\u4e00\u5bf9\u4e00\u7684\u6bd4\u8f83,Memcached\u7684\u6027\u80fd\u672a\u5fc5\u80fd\u8d85\u8fc7\u6570\u636e\u5e93\uff0c\u800c\u5728\u9ad8\u8d1f\u8f7d\u7684\u60c5\u51b5\u4e0b\u5219\u4f18\u52bf\u660e\u663e\u3002
\nMemcached\u5e76\u4e0d\u9002\u7528\u4e8e\u66f4\u65b0\u9891\u7e41\u7684\u6570\u636e\uff0c\u56e0\u4e3a\u9891\u7e41\u66f4\u65b0\u7684\u6570\u636e\u5bfc\u81f4\u5927\u91cf\u7684Memcached\u66f4\u65b0\u548c\u8f83\u4f4e\u7684\u7f13\u51b2\u547d\u4e2d\u7387\uff0c\u8fd9\u53ef\u80fd\u4e5f\u662f\u4e3a\u4ec0\u4e48Shard\u6ca1 \u6709\u96c6\u6210\u5b83\u7684\u539f\u56e0\uff1bMemcached\u66f4\u591a\u7684\u662f\u6269\u5c55\u4e86\u6570\u636e\u5e93\u7684\u201d\u8bfb\u201c\u64cd\u4f5c\uff0c\u8fd9\u4e00\u70b9\u4e0a\u5b83\u548cSlave\u7684\u4f5c\u7528\u6709\u91cd\u53e0\uff0c\u4ee5\u81f3\u4e8e\u6709\u4eba\u4e89\u8bba\u8bf4\u5e94\u8be5 \u8ba9"Relication"\u56de\u5230\u5b83\u6700\u521d\u7684\u76ee\u7684\u201dOnline Backup"\u6570\u636e\u5e93\u4e0a\uff0c\u800c\u901a\u8fc7Memcached\u6765\u63d0\u4f9b\u6570\u636e\u5e93\u7684\u201c\u8bfb\u201d\u6269\u5c55\u3002\uff08\u5f53\u7136\u4e5f\u6709\u4eba\u8bf4\uff0c\u8003\u8651\u5230Memcached\u7684\u5bf9\u5e94\u7528\u5e26\u6765\u7684\u590d\u6742\u6027\uff0c\u8fd8\u662f\u614e \u7528\u3002\uff09
\n\u7136\u800c\uff0c\u5728\u4f53\u7cfb\u67b6\u6784\u4e2d\u589e\u52a0Memecached\u5e76\u4e0d\u662f\u6ca1\u6709\u4ee3\u4ef7\u7684\uff0c\u73b0\u6709\u7684\u5e94\u7528\u8981\u505a\u9002\u5f53\u7684\u4fee\u6539\u6765\u540c\u6b65Memcached\u548c\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\uff0c\u540c\u65f6Memcached\u4e0d\u63d0\u4f9b\u4efb\u4f55\u5197\u4f59\u548c\u201cfailover\u201d\u529f\u80fd\uff0c\u8fd9\u4e9b\u590d\u6742\u7684\u63a7\u5236\u90fd\u9700\u8981\u5e94\u7528\u6765\u5b9e\u73b0\u3002\u57fa\u672c\u7684\u5e94\u7528\u903b\u8f91\u5982\u4e0b\uff1a<\/p>\n\n\n
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<\/div><\/td>1$data
\n2 = memcached_fetch(
\n3 $id
\n4 );
\n5
\n6
\n7
\n8
\n9
\n10 return
\n11 $data
\n12 if
\n13 $data
\n14
\n15
\n16
\n17
\n18
\n19 $data
\n20 = db_fetch(
\n21 $id
\n22 );
\n23
\n24
\n25
\n26
\n27
\n28 memcached_store(
\n29 $id
\n30 ,
\n31 $data
\n32 );
\n33
\n34
\n35
\n36
\n37
\n38 return
\n39 $data
\n40 ;
\n41<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n\n\n
1
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<\/div><\/td>1 \u5bf9\u4e8e\u5199\u64cd\u4f5c\uff1a
\n2<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n\n\n
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<\/div><\/td>1db_store(
\n2 $id
\n3 ,
\n4 $data
\n5 );
\n6
\n7
\n8
\n9
\n10
\n11 memcached_store(
\n12 $id
\n13 ,
\n14 $data
\n15 );
\n16<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n\n\n
1
2
<\/div><\/td>1 \u6211\u4eec\u770b\u5230\u5728\u6bcf\u4e00\u6b21\u6570\u636e\u66f4\u65b0\u90fd\u9700\u8981\u66f4\u65b0Memcached\uff0c\u800c\u4e14\u6570\u636e\u5e93\u6216Memcached\u4efb\u4f55\u4e00\u70b9\u5199\u9519\u8bef\u5e94\u7528\u5c31\u53ef\u80fd\u53d6\u5f97\u201c\u8fc7\u671f\u201d\u7684\u6570\u636e\u800c\u5f97\u5230\u9519\u8bef\u7684\u7ed3\u679c\uff0c\u5982\u4f55\u4fdd\u8bc1\u6570\u636e\u5e93\u548cMemcached\u7684\u540c\u6b65\u5462\uff1f
\n2<\/div><\/td><\/tr><\/tbody><\/table><\/div>\n\n<\/pre>\n
\n\u5f53\u7528\u6237\u8bbf\u95ee\u5e76\u66f4\u65b0Shard\u6570\u636e\u65f6\uff0cFlickr\u91c7\u7528\u4e86\u5c06\u7528\u6237\u201c\u7c98\u201d\u5230\u67d0\u4e00\u673a\u5668\u7684\u505a\u6cd5\uff0c
\n$id = intval(substr($user_id, -10));
\n$id % $count_of_hosts_in_shard
\n\u5373\u540c\u4e00\u7528\u6237\u6bcf\u6b21\u767b\u5f55\u7684\u6240\u6709\u64cd\u4f5c\u5176\u5b9e\u90fd\u662f\u5728Shard\u4e2d\u7684\u4e00\u4e2aMaster\u4e0a\u8fd0\u884c\u7684\uff0c\u8fd9\u6837\u5373\u4f7f\u590d\u5236\u5230Slave\uff0c\u4e5f\u5c31\u662f\u53e6\u4e00\u53f0Master\u7684\u65f6\u5019\u6709\u5ef6\u65f6\uff0c\u4e5f\u4e0d\u4f1a\u5bf9\u7528\u6237\u6709\u5f71\u54cd\uff0c\u9664\u975e\u662f\u7528\u6237\u521a\u521a\u66f4\u65b0\uff0c\u5c1a\u672a\u590d\u5236\u800c\u8fd9\u53f0Master\u5c31\u51fa\u73b0\u6545\u969c\u4e86\uff0c\u4e0d\u8fc7\u8fd9\u79cd\u51e0\u7387\u5e94\u8be5\u5f88\u5c0f\u5427\u3002
\n\u5bf9\u4e8eCentral Database\u7684\u590d\u5236\u6ede\u540e\u548c\u540c\u6b65\u95ee\u9898\uff0cFlickr\u91c7\u7528\u4e86\u4e00\u79cd\u590d\u6742\u7684\u201cWrite Through Cache"\u7684\u673a\u5236\u6765\u5904\u7406\uff1a<\/p>\n "Write Through Cache"\u5c31\u662f\u5c06\u6240\u6709\u7684\u6570\u636e\u5e93\u201d\u5199\u201c\u64cd\u4f5c\u90fd\u5148\u5199\u5165\u201dCache"\uff0c\u7136\u540e\u7531Cache\u7edf\u4e00\u53bb\u66f4\u65b0\u6570\u636e\u5e93\u7684\u5404\u4e2aNode,\u201cWrite Through Cache"\u7ef4\u62a4\u6bcf\u4e00\u4e2aNode\u7684\u66f4\u65b0\u72b6\u6001\uff0c\u5f53\u6709\u8bfb\u8bf7\u6c42\u65f6\uff0c\u5373\u5c06\u8bf7\u6c42\u8f6c\u5411\u72b6\u6001\u4e3a\u201d\u5df2\u540c\u6b65\u201c\u7684Node\uff0c\u8fd9\u6837\u5373\u907f\u514d\u4e86\u590d\u5236\u6ede\u540e\u548cMemcached\u7684\u540c\u6b65\u95ee \u9898\uff0c\u4f46\u7f3a\u70b9\u662f\u5176\u5b9e\u73b0\u6781\u4e3a\u590d\u6742\uff0c\u201cWrite Throug Cache"\u5c42\u7684\u4ee3\u7801\u9700\u8981\u8003\u8651\u548c\u5b9e\u73b0\u6240\u6709\u201djournal","Transaction\u201c\uff0c\u201cfailover\u201d\uff0c\u548c\u201crecovery"\u8fd9\u4e9b\u6570\u636e\u5e93\u5df2\u7ecf \u5b9e\u73b0\u7684\u529f\u80fd\uff0c\u53e6\u5916\u8fd8\u8981\u8003\u8651\u81ea\u8eab\u7684"failover"\u95ee\u9898\u3002\u6211\u6ca1\u6709\u627e\u5230\u6709\u5173\u5177\u4f53\u5b9e\u73b0\u7684\u8bf4\u660e\uff0c\u53ea\u80fd\u731c\u6d4b\u8fd9\u4e00\u90e8\u5206\u7684\u5904\u7406\u53ef\u80fd\u4e5f\u662f\u76f4\u63a5\u5229\u7528\u6216\u662f\u5b9e\u73b0\u4e86\u7c7b\u4f3c\u4e8e Flickr\u7684Queue\u7cfb\u7edf\u5427\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"