{"id":3207,"date":"2022-05-22T14:54:36","date_gmt":"2022-05-22T06:54:36","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=3207"},"modified":"2022-05-22T14:54:41","modified_gmt":"2022-05-22T06:54:41","slug":"seata%e8%ae%b0%e5%bd%95","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=3207","title":{"rendered":"seata\u8bb0\u5f55"},"content":{"rendered":"\n<p><a href=\"https:\/\/www.bilibili.com\/video\/BV1FL4y1F7x6?spm_id_from=333.337.search-card.all.click\">\u3010\u7eaf\u60a6\u4eab\u7248\u3011spring cloud alibaba\u4e4bseata\u4ece\u5165\u95e8\u5230\u6e90\u7801\u8bb2\u89e3\uff01\u5206\u5e03\u5f0f\u4e8b\u52a1\u3001\u5206\u5e03\u5f0f\u7f13\u5b58\u3001\u5206\u5e03\u5f0f\u9501\u3001\u5fae\u670d\u52a1\u7f51\u7ea6\u8f66\u9879\u76ee\u5b9e\u6218\uff01_\u54d4\u54e9\u54d4\u54e9_bilibili<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.cnblogs.com\/jackion5\/p\/14788377.html\">\u5206\u5e03\u5f0f\u4e8b\u52a1\u89e3\u51b3\u65b9\u6848&#8211;Seata\u6e90\u7801\u89e3\u6790 &#8211; Lucky\u5e05\u5c0f\u6b66 &#8211; \u535a\u5ba2\u56ed (cnblogs.com)<\/a><\/p>\n\n\n\n<p>1.\u5199\u9694\u79bb<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"524\" src=\"https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-3-1024x524.png\" alt=\"\" class=\"wp-image-3209\" srcset=\"https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-3-1024x524.png 1024w, https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-3-300x154.png 300w, https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-3-768x393.png 768w, https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-3-1200x614.png 1200w, https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-3.png 1328w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption>\u9700\u8981\u62ff\u5230\u5168\u5c40\u9501\u624d\u80fd\u6267\u884c<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-4.png\" alt=\"\" class=\"wp-image-3211\" width=\"630\" height=\"138\" srcset=\"https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-4.png 905w, https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-4-300x66.png 300w, https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-4-768x169.png 768w\" sizes=\"(max-width: 630px) 100vw, 630px\" \/><\/figure>\n\n\n\n<p>2.\u8bfb\u9694\u79bb\uff0c\u9ed8\u8ba4\u662f\u8bfb\u672a\u63d0\u4ea4\uff0c\u5982\u679c\u8981\u8bfb\u5df2\u63d0\u4ea4\uff0c\u5219\u662f\u901a\u8fc7select for update\u6765\u83b7\u53d6\u5168\u5c40\u9501\u3002<\/p>\n\n\n\n<p>3.\u6574\u4f53\u6d41\u7a0b<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"811\" src=\"https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-6-1024x811.png\" alt=\"\" class=\"wp-image-3215\" srcset=\"https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-6-1024x811.png 1024w, https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-6-300x237.png 300w, https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-6-768x608.png 768w, https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-6-1200x950.png 1200w, https:\/\/www.zeroheart.xyz\/wordpress\/wp-content\/uploads\/2022\/05\/image-6.png 1507w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>4.\u6d41\u7a0b<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u4ece\u914d\u7f6e\u6587\u4ef6\u5165\u624b\uff0c\u4f7f\u7528Seata\u65f6\u9700\u8981\u914d\u7f6e\u4e24\u4e2abean\u5206\u522b\u662fDataSourceProxy\u548cGlobalTransactionScanner\uff0c\u914d\u7f6e\u5982\u4e0b\uff1a\n\n&lt;bean id=\"accountDataSourceProxy\" class=\"io.seata.rm.datasource.DataSourceProxy\">\n        &lt;constructor-arg ref=\"accountDataSource\" \/>\n&lt;\/bean>\n\n&lt;bean class=\"io.seata.spring.annotation.GlobalTransactionScanner\">\n         &lt;constructor-arg value=\"dubbo-demo-account-service\"\/>\n         &lt;constructor-arg value=\"my_test_tx_group\"\/>\n&lt;\/bean>\n\n\u4ece\u5b57\u9762\u4ee5\u4e0a\u770bDataSourceProxy\u610f\u601d\u5c31\u662f\u6570\u636e\u6e90\u7684\u4ee3\u7406\uff0c\u6784\u9020\u51fd\u6570\u4e2d\u9700\u8981\u4f20\u5165\u9700\u8981\u88ab\u4ee3\u7406\u7684\u6570\u636e\u6e90\uff0c\u6bd4\u5982\u963f\u91cc\u7684DruidDataSource\uff1bGlobalTransactionScanner\u610f\u601d\u662f\u5168\u5c40\u4e8b\u52a1\u626b\u63cf\u5668\uff0c\u90a3\u4e48\u5e94\u8be5\u5c31\u662f\u7528\u6765\u626b\u63cf\u9879\u76ee\u4e2d\u914d\u7f6e\u7684\u6240\u6709\u5168\u5c40\u4e8b\u52a1\u3002\u6240\u4ee5\u4e86\u89e3Seata\u5c31\u9700\u8981\u4ece\u8fd9\u4e24\u4e2a\u7c7b\u5f00\u59cb\u7740\u624b\u3002\n\n5.2.1\u3001\u521d\u59cb\u5316\u8fc7\u7a0b\n1\u3001\u542f\u52a8Seata Server\uff0cSeata Server\u662f\u4e00\u4e2aNetty\u670d\u52a1\u5668\uff0c\u9ed8\u8ba4\u76d1\u542c2181\u7aef\u53e3\n\n2\u3001\u5e94\u7528\u9879\u76ee\u542f\u52a8\uff0c\u901a\u8fc7\u914d\u7f6e\u7684GlobalTransacationScanner\u5bf9\u8c61\uff0c\u5728\u521d\u59cb\u5316\u8be5bean\u7684\u65f6\u5019\u6267\u884cinit\u65b9\u6cd5\uff0c\u5206\u522b\u521d\u59cb\u5316TM\u5ba2\u6237\u7aef\u548cRM\u5ba2\u6237\u7aef\uff0c\u5206\u522b\u662fTmNettyRemotingClient\u548cRmNettyRemotingClient\u5bf9\u8c61\n\n3\u3001TM\u5ba2\u6237\u7aef\u548cRM\u5ba2\u6237\u7aef\u548cTC\u670d\u52a1\u5668\u4fdd\u6301\u901a\u4fe1\uff0c\u5e76\u901a\u8fc7\u5fc3\u8df3\u673a\u5236\u4fdd\u6301\u6709\u6548\u957f\u8fde\u63a5\n\n4\u3001RM\u521d\u59cb\u5316\u7684\u65f6\u5019\u4f1a\u5c06\u81ea\u5df1\u7ba1\u7406\u7684\u8d44\u6e90\u4fe1\u606f\u6ce8\u518c\u7ed9TC\u670d\u52a1\u5668\uff0c\u4e5f\u5c31\u662f\u8d1f\u8d23\u7684\u6570\u636e\u6e90\u4fe1\u606f\uff0cTC\u91c7\u7528Map&lt;Channel,RpcContext>\u5b58\u50a8TM\u548cRM\u7684\u5ba2\u6237\u7aef\u4fe1\u606f\n\n5\u3001\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u521d\u59cb\u5316\u65f6\u90fd\u4f1a\u6ce8\u518c\u76d1\u542c\u7684\u4e8b\u4ef6\u7f16\u53f7\u5e76\u7ed1\u5b9a\u5bf9\u5e94\u7684\u4e8b\u4ef6\u5904\u7406\u5668\n\n6\u3001\u901a\u8fc7\u4ee3\u7406\u6a21\u5f0f\u5206\u522b\u7ed9\u6570\u636e\u6e90DataSource\u521b\u5efa\u4ee3\u7406\u5bf9\u8c61DataSourceProxy\uff0c\u83b7\u53d6\u7684Connection\u5bf9\u8c61\u4e3a\u4ee3\u7406\u5bf9\u8c61ConnectionProxy\n\n5.2.2\u3001\u5f00\u542f\u4e8b\u52a1\u6d41\u7a0b\n1\u3001\u901a\u8fc7GlobalTransactionScanner\u7ed9\u88ab@GlobalTransactional\u6ce8\u89e3\u4fee\u9970\u7684\u65b9\u6cd5\u521b\u5efa\u52a8\u6001\u4ee3\u7406\uff0c\u521b\u5efa\u4e86\u4e00\u4e2a\u65b9\u6cd5\u62e6\u622a\u5668GlobalTransactionInterceptor\u5bf9\u8c61\n\n2\u3001\u88ab@GlobalTransactional\u6ce8\u89e3\u4fee\u9970\u7684\u65b9\u6cd5\u6267\u884c\u65f6\u8d70\u65b9\u6cd5\u62e6\u622a\u5668GlobalTransactionalInterceptor\u5bf9\u8c61\u7684invoke\u65b9\u6cd5\u5904\u7406\u589e\u5f3a\u903b\u8f91\n\n3\u3001\u6839\u636e\u4e8b\u52a1\u4f20\u64ad\u673a\u5236\u9009\u62e9\u662f\u5426\u8d70\u4e8b\u52a1\uff0c\u5982\u679c\u8d70\u4e8b\u52a1\u5c31\u5f00\u542f\u5168\u5c40\u4e8b\u52a1\uff0c\u7531\u5f53\u524d\u7684TM\u5411TC\u53d1\u9001\u5f00\u542f\u5168\u5c40\u4e8b\u52a1\u7684\u8bf7\u6c42\n\n4\u3001TC\u63a5\u6536\u5f00\u542f\u4e8b\u52a1\u8bf7\u6c42\uff0c\u6839\u636e\u914d\u7f6e\u51b3\u5b9a\u91c7\u7528\u54ea\u79cd\u6301\u4e45\u5316\u65b9\u5f0f\uff0c\u53ef\u4ee5\u91c7\u7528Redis\u3001DB\u3001File\u7b49\u65b9\u5f0f\u6301\u4e45\u5316\u5168\u5c40\u4e8b\u52a1\uff0c\u5e76\u8fd4\u56de\u5168\u5c40\u4e8b\u52a1ID\n\n5\u3001TM\u83b7\u53d6\u5230\u5168\u5c40\u4e8b\u52a1ID\uff0c\u5b58\u5165\u4e0a\u4e0b\u6587RootContext\u4e2d\uff0c\u672c\u8d28\u662f\u901a\u8fc7ThreadLocal\u5b58\u50a8\n\n6\u3001TM\u5bf9\u5e94\u4e1a\u52a1\u65b9\u8c03\u7528\u5206\u5e03\u5f0f\u670d\u52a1\u5c06XID\u4f20\u9012\u8fc7\u53bb\uff0cDubbo\u91c7\u7528RpcContext\u3001HTTP\u91c7\u7528Header\u7684\u65b9\u5f0f\n\n7\u3001RM\u5bf9\u5e94\u4e1a\u52a1\u65b9\u88ab\u8c03\u7528\uff0c\u83b7\u53d6XID\uff0c\u5148\u6ce8\u518cRM\u5230TC\uff0c\u7136\u540e\u6267\u884c\u672c\u5730\u4e8b\u52a1\u5e76\u63d0\u4ea4\uff0c\u5e76\u4e14\u8bb0\u5f55undoLog\u5230\u6570\u636e\u5e93\uff0c\n\n8\u3001RM\u5c06\u672c\u5730\u4e8b\u52a1\u63d0\u4ea4\u7ed3\u679c\u901a\u8fc7brancheReport\u4e0a\u62a5\u7ed9TC\n\n9\u3001TC\u63a5\u6536\u5206\u652f\u4e0a\u62a5\u7ed3\u679c\uff0c\u5148\u66f4\u65b0\u5168\u5c40\u4e8b\u52a1\u548c\u5206\u652f\u4e8b\u52a1\u72b6\u6001\uff0c\u7136\u540e\u8fdb\u884c\u6301\u4e45\u5316\n\n5.2.3\u3001\u63d0\u4ea4\u4e8b\u52a1\u6d41\u7a0b\n1\u3001\u5982\u679c\u4e1a\u52a1\u6267\u884c\u6210\u529f\uff0cTM\u521b\u5efa\u5168\u5c40\u4e8b\u52a1\u63d0\u4ea4\u8bf7\u6c42\u5e76\u53d1\u9001\u7ed9TC\n\n2\u3001TC\u63a5\u6536\u5168\u5c40\u4e8b\u52a1\u63d0\u4ea4\u8bf7\u6c42\uff0c\u66f4\u65b0\u6301\u4e45\u5316\u7684\u5168\u5c40\u4e8b\u52a1\u72b6\u6001\n\n3\u3001TC\u6709\u4e2a\u5b9a\u65f6\u4efb\u52a1\uff0c\u53d1\u9001\u5220\u9664UndoLog\u7684\u8bf7\u6c42\u7ed9\u6240\u6709RM\u7528\u4e8e\u6e05\u7406\u6307\u5b9a\u65f6\u95f4\u6bb5\u5185\u7684UndoLog\n\n4\u3001RM\u63a5\u6536\u5230\u5220\u9664UndoLog\u8bf7\u6c42\uff0c\u5220\u9664\u6307\u5b9a\u65f6\u95f4\u6bb5\u5185\u7684UndoLog\uff0c\u9ed8\u8ba4\u662f\u5220\u9664\u8d85\u8fc77\u5929\u7684\n\n5.2.4\u3001\u56de\u6eda\u4e8b\u52a1\u6d41\u7a0b\n1\u3001\u5982\u679c\u4e1a\u52a1\u6267\u884c\u5931\u8d25\uff0cTM\u521b\u5efa\u5168\u5c40\u4e8b\u52a1\u56de\u6eda\u8bf7\u6c42\u5e76\u53d1\u9001\u7ed9TC\n\n2\u3001TC\u63a5\u6536\u5168\u5c40\u4e8b\u52a1\u56de\u6eda\u8bf7\u6c42\uff0c\u66f4\u65b0\u6301\u4e45\u5316\u7684\u5168\u5c40\u4e8b\u52a1\u72b6\u6001\n\n3\u3001TC\u6839\u636e\u5168\u5c40\u4e8b\u52a1\u83b7\u53d6\u5168\u90e8\u5206\u652f\u4e8b\u52a1\uff0c\u904d\u5386\u901a\u77e5\u5206\u652f\u4e8b\u52a1\u56de\u6eda\u4e8b\u52a1\uff0c\u4ec5\u901a\u77e5\u5206\u652f\u4e8b\u52a1\u63d0\u4ea4\u6210\u529f\u7684\uff0c\u5bf9\u4e8e\u5206\u652f\u4e8b\u52a1\u63d0\u4ea4\u5931\u8d25\u7684\u76f4\u63a5\u5220\u9664\uff1b\n\n4\u3001\u5206\u652f\u4e8b\u52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class=\"wp-block-preformatted\">5.2.6\u3001\u5b9e\u73b0\u7ec6\u8282\u68b3\u7406\n1\u3001\u670d\u52a1\u5668\u6ce8\u518cTM\u548cRM\u7684\u903b\u8f91\u5904\u7406\uff1f\n\u4e1a\u52a1\u7cfb\u7edf\u542f\u52a8\u65f6\u901a\u8fc7GlobalTransactionScanner\u521d\u59cb\u5316\u65b9\u6cd5afterPropertiesSet,\u521d\u59cb\u5316TMClient\u548cRMClient\n\u5b9e\u9645\u662f\u5206\u522b\u521b\u5efa\u4e24\u4e2aNetty\u5ba2\u6237\u7aefTmNettyRemotingClient\u548cRmNettyRemotingClient\u5bf9\u8c61\u548cTC\u670d\u52a1\u5668\u521b\u5efa\u8fde\u63a5,\u5e76\u5206\u522b\u53d1\u9001TM\u548cRM\u6ce8\u518c\u7684\u6307\u4ee4\u7ed9TC\nTC\u5904\u7406TM\u548cRM\u6ce8\u518c\u7684\u903b\u8f91\u4e3b\u8981\u5982\u4e0b:\n1.\u521b\u5efaRpcContext\u5bf9\u8c61\u5c01\u88c5TM\u5ba2\u6237\u7aef;\n2.\u521b\u5efa\u5ba2\u6237\u7aefChannel\u548cRpcContext\u5b58\u50a8\u5df2\u7ecf\u8ba4\u8bc1\u7684&lt;Channel,RpcContext> IDENTIFIED_CHANNELS\u96c6\u5408\u4e2d\u7f13\u5b58;\n3.\u5ba2\u6237\u7aef\u8ba4\u8bc1ID\u4e3a applicationId:clientIp\n4.TC\u91c7\u7528ConcurrentMap&lt;String, ConcurrentMap&lt;Integer, RpcContext>> TM_CHANNELS \u5b58\u50a8\u6240\u6709TM\u4fe1\u606f,key\u662f\u5ba2\u6237\u7aef\u8ba4\u8bc1ID,value\u662f\u7aef\u53e3\u53f7\u548cRpcContext\u7684\u5173\u8054\u4fe1\u606f\n5.TC\u91c7\u7528ConcurrentMap&lt;String, ConcurrentMap&lt;String, ConcurrentMap&lt;String, ConcurrentMap&lt;Integer, RpcContext>>>> RM_CHANNELS \u5b58\u50a8\u6240\u6709RM\u4fe1\u606f\n\u5b58\u50a8RM\u4fe1\u606f\u7684Map\u6709\u591a\u5c42,\u6bcf\u4e00\u5c42\u7684key\u4f9d\u6b21\u4e3aresourceId -> applicationId -> ip -> port -> 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