要在Apache Beam中配置HDFS集群,您可以按照以下步骤进行操作:
import apache_beam as beam
from apache_beam.options.pipeline_options import PipelineOptions
class CustomOptions(PipelineOptions):
@classmethod
def _add_argparse_args(cls, parser):
parser.add_argument('--hdfs_host', help='HDFS host name', default='localhost')
parser.add_argument('--hdfs_port', help='HDFS port', default=9000)
options = CustomOptions()
pipeline = beam.Pipeline(options=options)
hdfs_path = f'hdfs://{options.hdfs_host}:{options.hdfs_port}/path/to/file'
(pipeline
| 'Read from HDFS' >> beam.io.ReadFromText(hdfs_path)
| 'Process data' >> beam.Map(process_fn)
| 'Write to HDFS' >> beam.io.WriteToText(hdfs_path)
)
pipeline.run().wait_until_finish()
在上述代码中,CustomOptions
类继承自PipelineOptions
,并添加了--hdfs_host
和--hdfs_port
参数。在步骤4中,使用options.hdfs_host
和options.hdfs_port
获取HDFS集群的主机名和端口号。