有没有办法以编程方式将JSON转换为AVRO Schema?

问题描述：

我需要创建AVRO文件，但为此我需要做两件事:

I need to create AVRO file but for that I need 2 things:

1)JSON

2)Avro架构

根据这两个要求-我有JSON:

From these 2 requirements - I have JSON:

{"web-app": {
  "servlet": [   
    {
      "servlet-name": "cofaxCDS",
      "servlet-class": "org.cofax.cds.CDSServlet",
      "init-param": {
        "configGlossary:installationAt": "Philadelphia, PA",
        "configGlossary:adminEmail": "ksm@pobox.com",
        "configGlossary:poweredBy": "Cofax",
        "configGlossary:poweredByIcon": "/images/cofax.gif",
        "configGlossary:staticPath": "/content/static",
        "templateProcessorClass": "org.cofax.WysiwygTemplate",
        "templateLoaderClass": "org.cofax.FilesTemplateLoader",
        "templatePath": "templates",
        "templateOverridePath": "",
        "defaultListTemplate": "listTemplate.htm",
        "defaultFileTemplate": "articleTemplate.htm",
        "useJSP": false,
        "jspListTemplate": "listTemplate.jsp",
        "jspFileTemplate": "articleTemplate.jsp",
        "cachePackageTagsTrack": 200,
        "cachePackageTagsStore": 200,
        "cachePackageTagsRefresh": 60,
        "cacheTemplatesTrack": 100,
        "cacheTemplatesStore": 50,
        "cacheTemplatesRefresh": 15,
        "cachePagesTrack": 200,
        "cachePagesStore": 100,
        "cachePagesRefresh": 10,
        "cachePagesDirtyRead": 10,
        "searchEngineListTemplate": "forSearchEnginesList.htm",
        "searchEngineFileTemplate": "forSearchEngines.htm",
        "searchEngineRobotsDb": "WEB-INF/robots.db",
        "useDataStore": true,
        "dataStoreClass": "org.cofax.SqlDataStore",
        "redirectionClass": "org.cofax.SqlRedirection",
        "dataStoreName": "cofax",
        "dataStoreDriver": "com.microsoft.jdbc.sqlserver.SQLServerDriver",
        "dataStoreUrl": "jdbc:microsoft:sqlserver://LOCALHOST:1433;DatabaseName=goon",
        "dataStoreUser": "sa",
        "dataStorePassword": "dataStoreTestQuery",
        "dataStoreTestQuery": "SET NOCOUNT ON;select test='test';",
        "dataStoreLogFile": "/usr/local/tomcat/logs/datastore.log",
        "dataStoreInitConns": 10,
        "dataStoreMaxConns": 100,
        "dataStoreConnUsageLimit": 100,
        "dataStoreLogLevel": "debug",
        "maxUrlLength": 500}},
    {
      "servlet-name": "cofaxEmail",
      "servlet-class": "org.cofax.cds.EmailServlet",
      "init-param": {
      "mailHost": "mail1",
      "mailHostOverride": "mail2"}},
    {
      "servlet-name": "cofaxAdmin",
      "servlet-class": "org.cofax.cds.AdminServlet"},

    {
      "servlet-name": "fileServlet",
      "servlet-class": "org.cofax.cds.FileServlet"},
    {
      "servlet-name": "cofaxTools",
      "servlet-class": "org.cofax.cms.CofaxToolsServlet",
      "init-param": {
        "templatePath": "toolstemplates/",
        "log": 1,
        "logLocation": "/usr/local/tomcat/logs/CofaxTools.log",
        "logMaxSize": "",
        "dataLog": 1,
        "dataLogLocation": "/usr/local/tomcat/logs/dataLog.log",
        "dataLogMaxSize": "",
        "removePageCache": "/content/admin/remove?cache=pages&id=",
        "removeTemplateCache": "/content/admin/remove?cache=templates&id=",
        "fileTransferFolder": "/usr/local/tomcat/webapps/content/fileTransferFolder",
        "lookInContext": 1,
        "adminGroupID": 4,
        "betaServer": true}}],
  "servlet-mapping": {
    "cofaxCDS": "/",
    "cofaxEmail": "/cofaxutil/aemail/*",
    "cofaxAdmin": "/admin/*",
    "fileServlet": "/static/*",
    "cofaxTools": "/tools/*"},

  "taglib": {
    "taglib-uri": "cofax.tld",
    "taglib-location": "/WEB-INF/tlds/cofax.tld"}}}

但是如何基于它创建AVRO Schema?

But how to create AVRO Schema based on it?

正在寻找实现此目的的程序方式，因为它将具有许多模式，并且不能每次都手动创建Avro Schema.

Looking for programatic way to do that since will have many schemas and can not create Avro Schema manually every time.

我检查了"avro-tools-1.8.1.jar"，但无法直接从JSON创建Avro架构.

I checked 'avro-tools-1.8.1.jar' but that can not create Avro Schema from JSON directly.

寻找可以创建JSON-> Avro模式的Jar或Python代码. 如果数据类型不是完美的(字符串，整数和浮点数足以用于启动)，则可以.

Looking for a Jar or Python code that can create JSON -> Avro schema. It is ok if Data Types are not perfect (Strings, Integers and Floats are good enough for start).

答

，您可以使用Kite SDK util从json输入中推断avro模式.

you can use Kite SDK util to infer avro schema from a json input.

示例:

    String json = "{\n" +
            "    \"id\": 1,\n" +
            "    \"name\": \"A green door\",\n" +
            "    \"price\": 12.50,\n" +
            "    \"tags\": [\"home\", \"green\"]\n" +
            "}\n"
            ;
    String avroSchema = JsonUtil.inferSchema(JsonUtil.parse(json), "myschema").toString();
    System.out.println(avroSchema);

结果:

{  
   "type":"record",
   "name":"myschema",
   "fields":[  
      {  
         "name":"id",
         "type":"int",
         "doc":"Type inferred from '1'"
      },
      {  
         "name":"name",
         "type":"string",
         "doc":"Type inferred from '\"A green door\"'"
      },
      {  
         "name":"price",
         "type":"double",
         "doc":"Type inferred from '12.5'"
      },
      {  
         "name":"tags",
         "type":{  
            "type":"array",
            "items":"string"
         },
         "doc":"Type inferred from '[\"home\",\"green\"]'"
      }
   ]
}

您可以在此处

有没有办法以编程方式将JSON转换为AVRO Schema?

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