将数据插入BigQuery表时出错

Question

我想在REST API中向BigQuery表插入一些行，但是它失败了，但有一般例外。我不知道我的代码中有什么问题。当我尝试从Chrome浏览器插入带有REST客户端的行时，它已通过。

        final HttpTransport TRANSPORT = new NetHttpTransport();
        final JsonFactory JSON_FACTORY = new JacksonFactory();

        HttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport();
        JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();

        // Build service account credential.
        GoogleCredential credential = new GoogleCredential.Builder().setTransport(httpTransport)
                .setJsonFactory(jsonFactory)
                .setServiceAccountId("foo")
                .setServiceAccountScopes(Collections.singleton(BigqueryScopes.BIGQUERY))
                .setServiceAccountPrivateKeyFromP12File(new File(Main.class.getClassLoader().getResource("foo").getFile()))
                .build();

        Bigquery service = new Bigquery.Builder(httpTransport, jsonFactory, credential)
                        .setApplicationName("BigQuery Samples").build();

        Bigquery.Projects.List projectListRequest = service.projects().list();

        TableDataInsertAllRequest.Rows data = new TableDataInsertAllRequest.Rows();
//      data.setInsertId("");

        Map<String, Object> json = new HashMap<>();

        json.put("from", "A");
        json.put("to", "B");


        TableDataInsertAllRequest.Rows row = new TableDataInsertAllRequest.Rows();
        row.setJson(json);

        List<TableDataInsertAllRequest.Rows> rows = new ArrayList<>();
        rows.add(row);

        TableDataInsertAllRequest requestData = new TableDataInsertAllRequest();
        requestData.setSkipInvalidRows(true);
        requestData.setIgnoreUnknownValues(true);
        requestData.setKind("bigquery#tableDataInsertAllRequest");
        requestData.setRows(rows);

        try {
            TableDataInsertAllResponse response = service.tabledata().insertAll("myDatastore "myProject", "test", requestData).execute();
            System.out.println(response);
        } catch (GoogleJsonResponseException e) {
            e.printStackTrace();
        }

使用REST客户端在URL https://www.googleapis.com/bigquery/v2/projects/myProject/datasets/myDatastore/tables/test/insertAll

上发送的请求

{
  "kind": "bigquery#tableDataInsertAllRequest",
  "skipInvalidRows": true,
  "ignoreUnknownValues": true,
  "rows": [
    {
      "json": {
        "from": "VIE",
        "to": "FRA"
      }
    }
  ]
}

从Java调用REST API的例外。

com.google.api.client.googleapis.json.GoogleJsonResponseException: 503 Service Unavailable
{
  "code" : 503,
  "errors" : [ {
    "domain" : "global",
    "message" : "Error encountered during execution. Retrying may solve the problem.",
    "reason" : "backendError"
  } ],
  "message" : "Error encountered during execution. Retrying may solve the problem."
}
    at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:145)
    at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:113)
    at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:40)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest$1.interceptResponse(AbstractGoogleClientRequest.java:321)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1056)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:419)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:352)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:469)
    at com.example.Main.main(Main.java:97)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)