python - MySQL 到云存储桶 Airflow DAG 的 UnicodeDecodeError

Question

我创建了一个 DAG，它从数据库中提取 MySQL 数据并将其作为 json 文件加载到云存储，然后加载到 BigQuery。

DAG 适用于某些表，但不适用于所有表，因为它无法解码表中的某些字符。这是相当多的数据，所以我无法准确指出错误或无效字符的位置。

我尝试将数据库、表和列字符集从 utf8 更改为 utf8mb4。这没有帮助。

我也尝试过调用encoding='utf-8'以及'iso-8859-1'，但是我认为我没有正确调用它们，因为我一直在用我的连接这样做，并且我仍然得到同样的错误。

我正在运行 Python 2.7.12 和 Airflow v1.8.0

更新:阅读本文后:https://cwiki.apache.org/confluence/display/AIRFLOW/Common+Pitfalls建议使用定义字符集的连接字符串，例如:sql_alchemy_conn = mysql://airflow@localhost:3306/airflow?charset=utf8

如何使用 Cloud SQL 实例来完成此操作？

podio_connections = [
    'mysql_connection'
]

podio_tables = [
     'finance_banking_details',
     'finance_goods_invoices',
]

default_args = {
    'owner': 'xxxxxx',
    'start_date': datetime(2018,1,11),
    'depends_on_past': False,
    'retries': 2,
    'retry_delay': timedelta(minutes=5),
}

dag = DAG('mysql_to_bigquery', default_args=default_args, schedule_interval='@daily')

slack_notify = SlackAPIPostOperator(
    task_id='slack_notify',
    token='xxxxxx',
    channel='data-status',
    username='airflow',
    text='Successfully performed Podio ETL operation',
    dag=dag)

for connection in podio_connections:
    for table in podio_tables:
        extract = MySqlToGoogleCloudStorageOperator(
            task_id="extract_mysql_%s_%s"%(connection,table),
            mysql_conn_id=connection,
            google_cloud_storage_conn_id='gcp_connection',
            sql="SELECT *, '%s' as source FROM podiodb.%s"%(connection,table),
            bucket='podio-reader-storage',
            filename="%s/%s/%s{}.json"%(connection,table,table),            
            schema_filename="%s/schemas/%s.json"%(connection,table),
        dag=dag)

        load = GoogleCloudStorageToBigQueryOperator(
            task_id="load_bg_%s_%s"%(connection,table),
            bigquery_conn_id='gcp_connection',
            google_cloud_storage_conn_id='gcp_connection',
            bucket='podio-reader-storage',
            #destination_project_dataset_table="podio-data.%s.%s"%(connection,table),
            destination_project_dataset_table = "podio-data.podio_data1.%s"%(table),
            source_objects=["%s/%s/%s*.json"%(connection,table,table)],
            schema_object="%s/schemas/%s.json"%(connection,table),
            source_format='NEWLINE_DELIMITED_JSON',
            write_disposition='WRITE_TRUNCATE',
            dag=dag)

        load.set_upstream(extract)
        slack_notify.set_upstream(load)

[2018-01-12 15:36:10,221] {models.py:1417} ERROR - 'utf8' codec can't decode byte 0x96 in position 36: invalid start byte

Traceback (most recent call last):

File "/usr/local/lib/python2.7/dist-packages/airflow/models.py", line 1374, in run result = task_copy.execute(context=context)

File "/usr/local/lib/python2.7/dist-packages/airflow/contrib/operators/mysql_to_gcs.py", line 91, in execute files_to_upload = self._write_local_data_files(cursor)

File "/usr/local/lib/python2.7/dist-packages/airflow/contrib/operators/mysql_to_gcs.py", line 136, in _write_local_data_files json.dump(row_dict, tmp_file_handle)

File "/usr/lib/python2.7/json/init.py", line 189, in dump for chunk in iterable:

File "/usr/lib/python2.7/json/encoder.py", line 434, in _iterencode for chunk in _iterencode_dict(o, _current_indent_level):

File "/usr/lib/python2.7/json/encoder.py", line 390, in _iterencode_dict yield _encoder(value)

UnicodeDecodeError: 'utf8' codec can't decode byte 0x96 in position 36: invalid start byte

Answer 1

96 是 latin1 十六进制，表示“en-dash”。将数据更改为 utf8，或者更改与 MySQL 的连接以表明您正在使用字符集 latin1。