AWS Glue的数据验证功能可以使用称为"DynamicFrame"的抽象概念来创建。在动态框架中,数据集被表示为一个分层的、附加了架构的JSON格式,主要包括以下部分:
基本数据验证可以使用以下步骤实现:
from awsglue.dynamicframe import DynamicFrame
from pyspark.sql.types import StructType, StructField, StringType
schema = StructType([
StructField("id", StringType(), True),
StructField("name", StringType(), True),
StructField("city", StringType(), True),
])
dynamic_frame = DynamicFrame.from_options(
connection_type="s3",
format="csv",
schema=schema,
connection_options={
"paths": ["s3://bucket/path/to/csv/files/"]
}
)
# 行级别验证(如需要满足特定的字段值)
from awsglue.dynamicframe import DropRecordTransform
from awsglue.utils import getResolvedOptions
args = getResolvedOptions(sys.argv, ['threshold'])
threshold = args['threshold']
drop_transform = DropRecordTransform(dynamic_frame, lambda x: x['city'] != threshold)
dynamic_frame = drop_trasnform.resolve(dynamic_frame)
# 数据列级别验证
from awsglue.dynamicframe import FilterTransform
filter_transfrom = FilterTrasnform(
dynamic_frame,
lambda x: x['city'] is not None and x['city'] != ''
)
dynamic_frame = filter_transfrom.resolve(dynamic_frame)