Question

import logging
from datetime import datetime, timedelta

from airflow.utils import dates
from airflow import DAG
from airflow.operators.python_operator import PythonOperator
from airflow.contrib.operators.bigquery_get_data import BigQueryGetDataOperator




default_args = {
    'owner': 'airflow',
    'depends_on_past': False,
    'start_date': dates.days_ago(2),
}

dag = DAG(
    dag_id='bigQueryPipeline',
    default_args=default_args,
    schedule_interval='0 0 * * *'
)


t1 = BigQueryGetDataOperator(
    task_id='bigquery_test',
    dataset_id= <my-dataset-name>,
    table_id= <my-table-id>,
    max_results='2',
)


def print_context(**context):
    import time
    import json
    xcom_pull = context['ti'].xcom_pull(task_ids='bigquery_test')
    logging.info('logging ', json.dumps(xcom_pull))


t2 = PythonOperator(
    task_id='print_result',
    python_callable=print_context,
    provide_context=True,
    dag=dag
)

t1 >> t2

if __name__ == "__main__":
    dag.cli()

所以，这是我的DAG。我正在测试从BigQuery表获取数据。除了max_results参数（位于docs中）之外，其他所有东西都起作用。

我在日志中看到：

[2019-11-26 14:46:02,272] {bigquery_get_data.py:92} INFO - Fetching Data from:
[2019-11-26 14:46:02,272] {bigquery_get_data.py:94} INFO - Dataset: <my-dataset> ; Table: <my-table> ; Max Results: 2
[2019-11-26 14:46:02,291] {logging_mixin.py:112} INFO - [2019-11-26 14:46:02,291] {gcp_api_base_hook.py:145} INFO - Getting connection using `google.auth.default()` since no key file is defined for hook.
[2019-11-26 14:46:02,309] {logging_mixin.py:112} INFO - [2019-11-26 14:46:02,309] {discovery.py:271} INFO - URL being requested: GET https://www.googleapis.com/discovery/v1/apis/bigquery/v2/rest
[2019-11-26 14:46:02,412] {logging_mixin.py:112} INFO - [2019-11-26 14:46:02,412] {discovery.py:867} INFO - URL being requested: GET https://bigquery.googleapis.com/bigquery/v2/projects/<my-project>/datasets/<my-dataset>tables/<my-table>/data?maxResults=2&alt=json
[2019-11-26 14:46:02,851] {bigquery_get_data.py:106} INFO - Total Extracted rows: 77374

请注意第二行的Max Results: 2和第五行的?maxResults=2查询字符串。除此之外，最后一行Total Extracted rows: 77374。

我猜这可能是bigquery api错误？

你们中有人知道如何向Airflow报告吗？还有Google？

编辑：找到了submit bug reports for airflow的位置。