在Apache Nifi中将两个模式合并为一个 [英] Merge two schemas into one in Apache nifi

问题描述

我正在尝试使用Apache nifi将两个csv文件合并为一个json. 两个csv是person.csv，其中包含有关人的信息:

I'm trying to merge two csv files into a json using Apache nifi. Two csv's are persons.csv containing information about people:

Id|Name|Surname
ABC-123|John|Smith
ABC-111|Allan|Wood
ABC-001|Grace|Kelly

第二个csv包含这些人参加的活动的列表:

And the second csv contains list of events these people have attended:

EId|PId|Date|Desc
1|ABC-123|2017-05-01|"Groove party"
2|ABC-111|2017-06-01|"Snack No. One"
3|ABC-123|2017-06-01|"The night out"

我正在使用( git枢纽上的Nifi流):

• GetFile
• UpdateAttribute(schema.name)
• 拆分记录
• ExtractText
• UpdateAttribute(correlation.id，newschema)
• 漏斗
• 合并记录/合并内容
• PutFile

试图实现最终的json:

Trying to achieve final json:

{
"Person": {
    "Id": "ABC-123",
    "Name": "John",
    "Surname": "Smith",
    "Events": [{
        "Date": "2017-05-01",
        "Name": "Groove party"
    }, {
        "Date": "2017-06-01",
        "Name": "The night out"
    }]
}
}

但是我不确定如何设置合并记录，或者在将内容合并到单个json之后如何合并多条csv行.有办法吗?

But I'm not sure how to set up Merge Record, or how to join multiple csv lines after Merge Content into a single json. Is there a way how to do it?

推荐答案

您实际上可以使用

1- ConvertRecord (CSV到JSON)-在您的情况下使用Avro架构

1- ConvertRecord(CSV to JSON) - using Avro Schema in your case

CSVReader

CSVReader

JsonRecordSetWriter

JsonRecordSetWriter

AvroSchemaRegistry

AvroSchemaRegistry

   {
 "name": "person",
 "namespace": "nifi",
 "type": "record",
 "fields": [
 {"name": "Id" , "type" : "string"},
 {"name": "Name" , "type" : "string"},
 {"name": "Surname" , "type" : "string"}
 ]
}

• 2-SplitJson
• 3-EvaluateJson
• 4-LookupAttribute(获取Desc SimpleCsvFileLookupService)
• 5-LookupAttribute(获取日期SimpleCsvFileLookupService)
  • 6-AttriutetoJson
  • 2 - SplitJson
  • 3 - EvaluateJson
  • 4 - LookupAttribute (Get Desc SimpleCsvFileLookupService)
  • 5 - LookupAttribute (Get Date SimpleCsvFileLookupService)
    • 6 - AttriutetoJson

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