{"id":95021,"date":"2026-08-15T23:41:12","date_gmt":"2026-08-15T15:41:12","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/95021.html"},"modified":"2026-08-15T23:41:12","modified_gmt":"2026-08-15T15:41:12","slug":"langgraph-%e5%a4%b1%e8%b4%a5%e6%81%a2%e5%a4%8d%e8%af%a6%e8%a7%a3%ef%bc%9a%e4%b8%ba%e4%bb%80%e4%b9%88%e6%88%90%e5%8a%9f%e8%8a%82%e7%82%b9%e4%b8%8d%e4%bc%9a%e9%87%8d%e5%a4%8d%e6%89%a7%e8%a1%8c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/95021.html","title":{"rendered":"LangGraph \u5931\u8d25\u6062\u590d\u8be6\u89e3\uff1a\u4e3a\u4ec0\u4e48\u6210\u529f\u8282\u70b9\u4e0d\u4f1a\u91cd\u590d\u6267\u884c\uff1f"},"content":{"rendered":"

\u524d\u9762\u6211\u4eec\u5df2\u7ecf\u5b66\u4e60\u4e86 Checkpoint\u3001get_state_history()\u3001Replay \u548c Fork\u3002<\/p>\n

\u8fd9\u4e00\u7bc7\u7ee7\u7eed\u770b\u4e00\u4e2a\u66f4\u5b9e\u7528\u7684\u95ee\u9898：<\/p>\n

\u5982\u679c\u540c\u4e00\u4e2a SuperStep \u4e2d，\u4e00\u4e2a\u8282\u70b9\u6267\u884c\u6210\u529f，\u53e6\u4e00\u4e2a\u8282\u70b9\u6267\u884c\u5931\u8d25，\u4fee\u590d\u540e\u6062\u590d\u8fd0\u884c\u65f6，\u6210\u529f\u8282\u70b9\u8fd8\u4f1a\u4e0d\u4f1a\u91cd\u65b0\u6267\u884c？<\/p>\n

LangGraph \u4e2d：\u5df2\u7ecf\u6210\u529f\u7684\u4efb\u52a1\u7ed3\u679c\u53ef\u4ee5\u88ab\u68c0\u67e5\u70b9\u4fdd\u5b58，\u6062\u590d\u65f6\u76f4\u63a5\u590d\u7528\u3002<\/p>\n

1. \u4e00\u4e2a\u8282\u70b9\u5931\u8d25\u540e，LangGraph \u4fdd\u5b58\u4e86\u4ec0\u4e48？<\/h3>\n

\u5047\u8bbe\u56fe\u7ed3\u6784\u662f：<\/p>\n

START
\n |
\nnode_change_topic
\n |
\n +——> node_poem
\n |
\n +——> node_joke
\n |
\n v
\n node_output
\n |
\n END<\/p>\n

\u5176\u4e2d node_poem \u548c node_joke \u5c5e\u4e8e\u540c\u4e00\u4e2a SuperStep\u3002<\/p>\n

\u4e3a\u4e86\u6a21\u62df\u5931\u8d25，\u53ef\u4ee5\u6545\u610f\u8ba9：<\/p>\n

def<\/span> node_joke<\/span>(<\/span>state)<\/span>:<\/span>
\n raise<\/span> Exception(<\/span>"\u4eba\u4e3a\u4e2d\u65ad"<\/span>)<\/span><\/p>\n

\u7b2c\u4e00\u6b21\u6267\u884c\u65f6：<\/p>\n

node_change_topic \u6267\u884c\u6210\u529f
\n \u2193
\nnode_poem \u548c node_joke \u5e76\u884c\u6267\u884c
\n \u2193
\nnode_poem：\u6210\u529f
\nnode_joke：\u5931\u8d25
\n \u2193
\n\u56fe\u4e2d\u65ad<\/p>\n

\u8fd9\u65f6\u67e5\u770b\u5386\u53f2\u68c0\u67e5\u70b9：<\/p>\n

history =<\/span> list<\/span>(<\/span>
\n graph.<\/span>get_state_history(<\/span>config)<\/span>
\n)<\/span><\/p>\n

\u53ef\u4ee5\u770b\u5230\u5bf9\u5e94\u7684 tasks \u4e2d：<\/p>\n

PregelTask(<\/span>
\n name=<\/span>"node_poem"<\/span>,<\/span>
\n error=<\/span>None<\/span>,<\/span>
\n result=<\/span>{<\/span>
\n "poem"<\/span>:<\/span> "…"<\/span>
\n }<\/span>
\n)<\/span><\/p>\n

\u800c\u5931\u8d25\u8282\u70b9：<\/p>\n

PregelTask(<\/span>
\n name=<\/span>"node_joke"<\/span>,<\/span>
\n error=<\/span>"Exception('\u4eba\u4e3a\u4e2d\u65ad')"<\/span>,<\/span>
\n result=<\/span>None<\/span>
\n)<\/span><\/p>\n

\u6240\u4ee5\u8fd9\u91cc\u53ef\u4ee5\u7406\u89e3\u4e3a：<\/p>\n

result
\n=
\n\u8282\u70b9\u5df2\u7ecf\u6210\u529f\u4ea7\u751f\u7684\u7ed3\u679c<\/p>\n

error
\n=
\n\u8282\u70b9\u6267\u884c\u5931\u8d25\u65f6\u8bb0\u5f55\u7684\u5f02\u5e38<\/p>\n

\n

2. \u4e3a\u4ec0\u4e48 node_poem \u4e0d\u9700\u8981\u91cd\u65b0\u6267\u884c？<\/h3>\n

\u867d\u7136 node_poem \u548c node_joke \u5728\u540c\u4e00\u4e2a SuperStep \u4e2d\u8fd0\u884c，\u4f46\u5176\u4e2d\u4e00\u4e2a\u5931\u8d25，\u5e76\u4e0d\u4f1a\u8ba9\u53e6\u4e00\u4e2a\u5df2\u7ecf\u6210\u529f\u7684\u7ed3\u679c\u5168\u90e8\u4e22\u5931\u3002<\/p>\n

\u68c0\u67e5\u70b9\u5df2\u7ecf\u77e5\u9053：<\/p>\n

node_poem
\n\u6210\u529f
\nresult \u5df2\u4fdd\u5b58<\/p>\n

node_joke
\n\u5931\u8d25
\nerror \u5df2\u4fdd\u5b58<\/p>\n

\u56e0\u6b64\u6062\u590d\u65f6，LangGraph \u53ef\u4ee5：<\/p>\n

\u590d\u7528 node_poem.result
\n +
\n\u91cd\u65b0\u6267\u884c node_joke<\/p>\n

\u800c\u4e0d\u662f：<\/p>\n

node_poem \u518d\u6267\u884c\u4e00\u6b21
\nnode_joke \u518d\u6267\u884c\u4e00\u6b21<\/p>\n

\u8fd9\u5bf9\u5305\u542b\u5927\u6a21\u578b\u8c03\u7528\u3001API \u8bf7\u6c42\u3001\u6570\u636e\u5e93\u67e5\u8be2\u7b49\u6602\u8d35\u64cd\u4f5c\u7684\u5de5\u4f5c\u6d41\u5c24\u5176\u91cd\u8981\u3002<\/p>\n

\n

3. \u4fee\u590d BUG \u540e\u5982\u4f55\u6062\u590d？<\/h3>\n

\u5148\u628a node_joke \u4fee\u597d：<\/p>\n

def<\/span> node_joke<\/span>(<\/span>state)<\/span>:<\/span>
\n topic =<\/span> state[<\/span>"topic"<\/span>]<\/span><\/p>\n

joke =<\/span> model.<\/span>invoke(<\/span>
\n [<\/span>
\n HumanMessage(<\/span>
\n f"\u5199\u4e00\u4e2a\u5173\u4e8e <\/span>{<\/span>topic}<\/span><\/span> \u7684\u7b11\u8bdd"<\/span><\/span>
\n )<\/span>
\n ]<\/span>
\n )<\/span>.<\/span>content<\/p>\n

return<\/span> {<\/span>
\n "joke"<\/span>:<\/span> joke
\n }<\/span><\/p>\n

\u7136\u540e\u91cd\u65b0\u7f16\u8bd1\u56fe：<\/p>\n

new_graph =<\/span> builder.<\/span>compile<\/span>(<\/span>
\n checkpointer=<\/span>checkpointer
\n)<\/span><\/p>\n

\u8fd9\u91cc\u6700\u91cd\u8981\u7684\u662f：<\/p>\n

\u5fc5\u987b\u7ee7\u7eed\u4f7f\u7528\u4e4b\u524d\u90a3\u4e2a Checkpointer\u3002<\/p>\n

\u56e0\u4e3a\u5386\u53f2 Checkpoint \u5c31\u4fdd\u5b58\u5728\u5b83\u91cc\u9762\u3002<\/p>\n

\u5982\u679c\u91cd\u65b0\u521b\u5efa：<\/p>\n

checkpointer =<\/span> InMemorySaver(<\/span>)<\/span><\/p>\n

\u90a3\u5c31\u662f\u4e00\u4e2a\u65b0\u7684\u7a7a\u5b58\u50a8\u5668，\u539f\u6765\u7684\u5386\u53f2\u4e5f\u5c31\u627e\u4e0d\u5230\u4e86\u3002<\/p>\n

\u6062\u590d\u65f6：<\/p>\n

res =<\/span> new_graph.<\/span>invoke(<\/span>
\n None<\/span>,<\/span>
\n config=<\/span>{<\/span>
\n "configurable"<\/span>:<\/span> {<\/span>
\n "thread_id"<\/span>:<\/span> "123"<\/span>
\n }<\/span>
\n }<\/span>
\n)<\/span><\/p>\n

\u8fd9\u91cc：<\/p>\n

input<\/span>=<\/span>None<\/span><\/p>\n

\u8868\u793a：<\/p>\n

\u4e0d\u518d\u63d0\u4f9b\u65b0\u7684\u8f93\u5165
\n\u800c\u662f\u4ece\u5f53\u524d thread_id \u5df2\u4fdd\u5b58\u7684\u72b6\u6001\u7ee7\u7eed<\/p>\n

\u5b9e\u9645\u6062\u590d\u7ed3\u679c\u4e2d：<\/p>\n

node_joke
\n\u91cd\u65b0\u6267\u884c<\/p>\n

node_output
\n\u7ee7\u7eed\u6267\u884c<\/p>\n

node_poem
\n\u6ca1\u6709\u91cd\u65b0\u6267\u884c<\/p>\n

\u6700\u7ec8\u8f93\u51fa\u4e2d\u7684\u8bd7\u4ecd\u7136\u662f\u7b2c\u4e00\u6b21 node_poem \u6210\u529f\u65f6\u751f\u6210\u7684\u5185\u5bb9，\u8bf4\u660e\u5b83\u7684\u7ed3\u679c\u88ab\u590d\u7528\u4e86\u3002<\/p>\n

\n

4. \u5931\u8d25\u6062\u590d\u548c Replay \u6709\u4ec0\u4e48\u533a\u522b？<\/h3>\n

\u8fd9\u4e24\u4e2a\u6982\u5ff5\u770b\u8d77\u6765\u5f88\u50cf，\u4f46\u76ee\u7684\u4e0d\u540c\u3002<\/p>\n

Replay：<\/p>\n

\u6211\u4e3b\u52a8\u627e\u5230\u4e00\u4e2a\u5386\u53f2 Checkpoint
\n\u7136\u540e\u4ece\u90a3\u91cc\u91cd\u65b0\u6267\u884c<\/p>\n

\u4f8b\u5982：<\/p>\n

graph.<\/span>invoke(<\/span>
\n None<\/span>,<\/span>
\n old_checkpoint.<\/span>config
\n)<\/span><\/p>\n

\u800c\u5931\u8d25\u6062\u590d\u662f：<\/p>\n

\u4e0a\u4e00\u6b21\u6267\u884c\u56e0\u4e3a\u5f02\u5e38\u4e2d\u65ad
\n \u2193
\n\u4fee\u590d BUG
\n \u2193
\n\u7ee7\u7eed\u4f7f\u7528\u539f\u6765\u7684 Checkpointer
\n \u2193
\n\u901a\u8fc7\u76f8\u540c thread_id \u6062\u590d
\n \u2193
\n\u63a5\u7740\u672a\u5b8c\u6210\u7684\u4efb\u52a1\u7ee7\u7eed\u6267\u884c<\/p>\n

\u53ef\u4ee5\u7b80\u5355\u8bb0：<\/p>\n

Replay
\n\u91cd\u65b0\u8d70\u4e00\u6b21<\/p>\n

\u5931\u8d25\u6062\u590d
\n\u4e0a\u6b21\u6ca1\u8d70\u5b8c，\u73b0\u5728\u63a5\u7740\u8d70<\/p>\n

\u5b83\u8fd8\u5728\u89e3\u51b3：<\/p>\n

\u4efb\u52a1\u6267\u884c\u5230\u4e86\u54ea\u91cc，\u4ee5\u53ca\u54ea\u4e9b\u8ba1\u7b97\u5df2\u7ecf\u5b8c\u6210\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u524d\u9762\u6211\u4eec\u5df2\u7ecf\u5b66\u4e60\u4e86 Checkpoint\u3001get_state_history()\u3001Replay \u548c Fork\u3002
\n\u8fd9\u4e00\u7bc7\u7ee7\u7eed\u770b\u4e00\u4e2a\u66f4\u5b9e\u7528\u7684\u95ee\u9898：
\n\u5982\u679c\u540c\u4e00\u4e2a SuperStep \u4e2d，\u4e00\u4e2a\u8282\u70b9\u6267\u884c\u6210\u529f，\u53e6\u4e00\u4e2a\u8282\u70b9\u6267\u884c\u5931\u8d25，\u4fee\u590d\u540e\u6062\u590d\u8fd0\u884c\u65f6，\u6210\u529f\u8282\u70b9\u8fd8\u4f1a\u4e0d\u4f1a\u91cd\u65b0\u6267\u884c？
\nLangGraph \u4e2d：\u5df2\u7ecf\u6210\u529f\u7684\u4efb\u52a1\u7ed3\u679c\u53ef\u4ee5\u88ab\u68c0\u67e5\u70b9\u4fdd\u5b58，\u6062\u590d\u65f6\u76f4\u63a5\u590d\u7528\u30021. \u4e00\u4e2a\u8282\u70b9\u5931\u8d25\u540e&#xf<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[997],"topic":[],"class_list":["post-95021","post","type-post","status-publish","format-standard","hentry","category-server","tag-langchain"],"yoast_head":"\nLangGraph \u5931\u8d25\u6062\u590d\u8be6\u89e3\uff1a\u4e3a\u4ec0\u4e48\u6210\u529f\u8282\u70b9\u4e0d\u4f1a\u91cd\u590d\u6267\u884c\uff1f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/95021.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LangGraph \u5931\u8d25\u6062\u590d\u8be6\u89e3\uff1a\u4e3a\u4ec0\u4e48\u6210\u529f\u8282\u70b9\u4e0d\u4f1a\u91cd\u590d\u6267\u884c\uff1f - 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