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JSON 结构对比可运行案例

结构化日志：解释 entries 首部插入导致的多处差异

数组按下标逐项比较。在 entries 开头插入记录后，后续元素位置移动，会产生多处修改和一个尾部新增；这不等于多条业务记录都发生了真实字段变更。需要按 ID 配对时应先在自己的业务逻辑中处理。

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示例工作台

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JSON 结构对比修改下方数据后重新运行
运行结果
[
  {
    "op": "replace",
    "path": "/data/entries/0/traceId",
    "oldValue": "demo-logs-1",
    "value": "demo-inserted"
  },
  {
    "op": "replace",
    "path": "/data/entries/0/message",
    "oldValue": "读取配置完成",
    "value": "新增演示记录"
  },
  {
    "op": "replace",
    "path": "/data/entries/1/traceId",
    "oldValue": "demo-logs-2",
    "value": "demo-logs-1"
  },
  {
    "op": "replace",
    "path": "/data/entries/1/message",
    "oldValue": "下游返回较慢",
    "value": "读取配置完成"
  },
  {
    "op": "replace",
    "path": "/data/entries/1/durationMs",
    "oldValue": 420,
    "value": 8
  },
  {
    "op": "replace",
    "path": "/data/entries/1/sampled",
    "oldValue": false,
    "value": true
  },
  {
    "op": "replace",
    "path": "/data/entries/1/level",
    "oldValue": "warn",
    "value": "info"
  },
  {
    "op": "replace",
    "path": "/data/entries/1/context/service",
    "oldValue": "demo-worker",
    "value": "demo-api"
  },
  {
    "op": "replace",
    "path": "/data/entries/1/context/labels/0",
    "oldValue": "retry",
    "value": "read"
  },
  {
    "op": "add",
    "path": "/data/entries/2",
    "value": {
      "traceId": "demo-logs-2",
      "message": "下游返回较慢",
      "durationMs": 420,
      "sampled": false,
      "level": "warn",
      "context": {
        "service": "demo-worker",
        "labels": [
          "retry"
        ]
      }
    }
  }
]

原例已核验，可修改输入后重新运行。

⌘ / Ctrl + Enter 运行
01

场景与操作说明

结构化日志中，同一 traceId 可对应多条日志。提取消息便于阅读，但排查仍需保留时间和关联标识；本例不读取服务器日志。

durationMs 的单位是毫秒，比较前必须确认两份日志使用相同单位。

  1. 核对 结构化日志 的字段层级，保留 traceId 的字符串类型。
  2. 修改一项输入并运行，观察结果中的值或路径如何变化。
  3. 载入对照样本，复现下面的变化；恢复原例会替换当前输入。
02

对照样本

对照样本交换 A 与 B。观察新增与删除的方向、修改前后值如何反转；没有差异时交换仍无差异。

查看对照输入
{
  "ok": true,
  "data": {
    "entries": [
      {
        "traceId": "demo-inserted",
        "message": "新增演示记录",
        "durationMs": 8,
        "sampled": true,
        "level": "info",
        "context": {
          "service": "demo-api",
          "labels": [
            "read"
          ]
        }
      },
      {
        "traceId": "demo-logs-1",
        "message": "读取配置完成",
        "durationMs": 8,
        "sampled": true,
        "level": "info",
        "context": {
          "service": "demo-api",
          "labels": [
            "read"
          ]
        }
      },
      {
        "traceId": "demo-logs-2",
        "message": "下游返回较慢",
        "durationMs": 420,
        "sampled": false,
        "level": "warn",
        "context": {
          "service": "demo-worker",
          "labels": [
            "retry"
          ]
        }
      }
    ],
    "summary": {
      "total": 2,
      "note": null
    }
  }
}
{
  "ok": true,
  "data": {
    "entries": [
      {
        "traceId": "demo-logs-1",
        "message": "读取配置完成",
        "durationMs": 8,
        "sampled": true,
        "level": "info",
        "context": {
          "service": "demo-api",
          "labels": [
            "read"
          ]
        }
      },
      {
        "traceId": "demo-logs-2",
        "message": "下游返回较慢",
        "durationMs": 420,
        "sampled": false,
        "level": "warn",
        "context": {
          "service": "demo-worker",
          "labels": [
            "retry"
          ]
        }
      }
    ],
    "summary": {
      "total": 2,
      "note": null
    }
  }
}

对照样本的实际结果

[
  {
    "op": "replace",
    "path": "/data/entries/0/traceId",
    "oldValue": "demo-inserted",
    "value": "demo-logs-1"
  },
  {
    "op": "replace",
    "path": "/data/entries/0/message",
    "oldValue": "新增演示记录",
    "value": "读取配置完成"
  },
  {
    "op": "replace",
    "path": "/data/entries/1/traceId",
    "oldValue": "demo-logs-1",
    "value": "demo-logs-2"
  },
  {
    "op": "replace",
    "path": "/data/entries/1/message",
    "oldValue": "读取配置完成",
    "value": "下游返回较慢"
  },
  {
    "op": "replace",
    "path": "/data/entries/1/durationMs",
    "oldValue": 8,
    "value": 420
  },
  {
    "op": "replace",
    "path": "/data/entries/1/sampled",
    "oldValue": true,
    "value": false
  },
  {
    "op": "replace",
    "path": "/data/entries/1/level",
    "oldValue": "info",
    "value": "warn"
  },
  {
    "op": "replace",
    "path": "/data/entries/1/context/service",
    "oldValue": "demo-api",
    "value": "demo-worker"
  },
  {
    "op": "replace",
    "path": "/data/entries/1/context/labels/0",
    "oldValue": "read",
    "value": "retry"
  },
  {
    "op": "remove",
    "path": "/data/entries/2",
    "oldValue": {
      "traceId": "demo-logs-2",
      "message": "下游返回较慢",
      "durationMs": 420,
      "sampled": false,
      "level": "warn",
      "context": {
        "service": "demo-worker",
        "labels": [
          "retry"
        ]
      }
    }
  }
]