簡單理解
spanType總共有三種:
- Entry:表示整個程式的span
- Local:表示程式內部的處理,是EntrySpan的一部分
- Exit:表示發起一個遠端呼叫,如請求db、redis,如發起http請求、rpc呼叫
spanLayer總共有六種:
- Unknown:未知
- Database:請求db
- RPCFramework:rpc呼叫
- Http:發起http請求(或者本身是http服務)
- MQ:訊息服務
- Cache:快取服務
場景一:一個http請求,處理上傳和請求db,則建立三個span
spanId=0 parentSpanId=-1 spanType=entry spanLayer=http
spanId=1 parentSpanId= 0 spanType=local spanLayer=Unknown
spanId=2 parentSpanId= 0 spanType=exit spanLayer=database
場景二:一個http請求,有http請求,則建立兩個個span
spanId=0 parentSpanId=-1 spanType=entry spanLayer=http
spanId=1 parentSpanId= 0 spanType=exit spanLayer=http
場景三:一個http請求,有訪問redis。場景二的第2個span正是訪問的它。建立兩個span(其中traceId和場景二的traceId相等)
spanId=0 parentSpanId=-1 spanType=entry spanLayer=http refs=包含場景二中第2個span的資訊
spanId=1 parentSpanId= 0 spanType=exit spanLayer=cache
原始日誌
這裡記錄一下真實的trace日誌,來證實上面說的場景二和場景三
場景二
{
"traceId": "6763beaf2ad8a9e4c05114b978a97072.17.756430259",
"traceSegmentId": "6763beaf2ad8a9e4c05114b978a97072.17.756430259",
"spans": [
{
"spanId": 0,
"parentSpanId": -1,
"startTime": "1639096358706",
"endTime": "1639096359252",
"refs": [],
"operationName": "/answer4/activityStyle",
"peer": "192.168.2.119:72",
"spanType": "Entry",
"spanLayer": "Http",
"componentId": 8001,
"isError": false,
"tags": [
{
"key": "url",
"value": "/answer4/activityStyle"
},
{
"key": "status_code",
"value": "200"
}
],
"logs": [],
"skipAnalysis": false
},
{
"spanId": 1,
"parentSpanId": 0,
"startTime": "1639096358775",
"endTime": "1639096359250",
"refs": [],
"operationName": "/op/answer4/activityStyle",
"peer": "container-ng9272:62",
"spanType": "Exit",
"spanLayer": "Http",
"componentId": 8002,
"isError": false,
"tags": [
{
"key": "url",
"value": "http://container-ng9272:62/op/answer4/activityStyle"
},
{
"key": "status_code",
"value": "200"
}
],
"logs": [],
"skipAnalysis": false
}
],
"service": "op",
"serviceInstance": "ca6185b0-752c-9aab-d9f9-6796da2c0646@172.18.0.5",
"isSizeLimited": false
}
場景三
{
"traceId": "6763beaf2ad8a9e4c05114b978a97072.17.756430259",
"traceSegmentId": "6763beaf2ad8a9e4c05114b978a97072.18.4224945771",
"spans": [
{
"spanId": 0,
"parentSpanId": -1,
"startTime": "1639096358782",
"endTime": "1639096359250",
"refs": [
{
"refType": "CrossProcess",
"traceId": "6763beaf2ad8a9e4c05114b978a97072.17.756430259",
"parentTraceSegmentId": "6763beaf2ad8a9e4c05114b978a97072.17.756430259",
"parentSpanId": 1,
"parentService": "op",
"parentServiceInstance": "ca6185b0-752c-9aab-d9f9-6796da2c0646@172.18.0.5",
"parentEndpoint": "/answer4/activityStyle",
"networkAddressUsedAtPeer": "container-ng9272:62"
}
],
"operationName": "/op/answer4/activityStyle",
"peer": "container-ng9272:62",
"spanType": "Entry",
"spanLayer": "Http",
"componentId": 8001,
"isError": false,
"tags": [
{
"key": "url",
"value": "/op/answer4/activityStyle"
},
{
"key": "status_code",
"value": "200"
}
],
"logs": [],
"skipAnalysis": false
},
{
"spanId": 1,
"parentSpanId": 0,
"startTime": "1639096358942",
"endTime": "1639096358966",
"refs": [],
"operationName": "Redis->get",
"peer": "localhost:6379",
"spanType": "Exit",
"spanLayer": "Cache",
"componentId": 7,
"isError": false,
"tags": [
{
"key": "db.type",
"value": "redis"
},
{
"key": "redis.command",
"value": "GET answer4:opdb"
}
],
"logs": [],
"skipAnalysis": false
}
],
"service": "op",
"serviceInstance": "ca6185b0-752c-9aab-d9f9-6796da2c0646@172.18.0.5",
"isSizeLimited": false
}
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