pyspark.RDD.saveAsNewAPIHadoopDataset#

RDD.saveAsNewAPIHadoopDataset(conf, keyConverter=None, valueConverter=None)[source]#

Output a Python RDD of key-value pairs (of form RDD[(K, V)]) to any Hadoop file system, using the new Hadoop OutputFormat API (mapreduce package). Keys/values are converted for output using either user specified converters or, by default, “org.apache.spark.api.python.JavaToWritableConverter”.

Added in version 1.1.0.

Parameters:

confdict: Hadoop job configuration
keyConverterstr, optional: fully qualified classname of key converter (None by default)
valueConverterstr, optional: fully qualified classname of value converter (None by default)

See also

SparkContext.newAPIHadoopRDD()
RDD.saveAsHadoopDataset()
RDD.saveAsHadoopFile()
RDD.saveAsNewAPIHadoopFile()
RDD.saveAsSequenceFile()

Examples

>>> import os
>>> import tempfile

Set the related classes

>>> output_format_class = "org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat"
>>> input_format_class = "org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat"
>>> key_class = "org.apache.hadoop.io.IntWritable"
>>> value_class = "org.apache.hadoop.io.Text"

>>> with tempfile.TemporaryDirectory(prefix="saveAsNewAPIHadoopDataset") as d:
...     path = os.path.join(d, "new_hadoop_file")
...
...     # Create the conf for writing
...     write_conf = {
...         "mapreduce.job.outputformat.class": (output_format_class),
...         "mapreduce.job.output.key.class": key_class,
...         "mapreduce.job.output.value.class": value_class,
...         "mapreduce.output.fileoutputformat.outputdir": path,
...     }
...
...     # Write a temporary Hadoop file
...     rdd = sc.parallelize([(1, ""), (1, "a"), (3, "x")])
...     rdd.saveAsNewAPIHadoopDataset(conf=write_conf)
...
...     # Create the conf for reading
...     read_conf = {"mapreduce.input.fileinputformat.inputdir": path}
...
...     # Load this Hadoop file as an RDD
...     loaded = sc.newAPIHadoopRDD(input_format_class,
...         key_class, value_class, conf=read_conf)
...     sorted(loaded.collect())
[(1, ''), (1, 'a'), (3, 'x')]