class SequenceFileRDDFunctions[K, V] extends Logging with Serializable
Extra functions available on RDDs of (key, value) pairs to create a Hadoop SequenceFile, through an implicit conversion.
- Source
- SequenceFileRDDFunctions.scala
- Note
This can't be part of PairRDDFunctions because we need more implicit parameters to convert our keys and values to Writable.
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- new SequenceFileRDDFunctions(self: RDD[(K, V)], _keyWritableClass: Class[_ <: Writable], _valueWritableClass: Class[_ <: Writable])(implicit arg0: IsWritable[K], arg1: ClassTag[K], arg2: IsWritable[V], arg3: ClassTag[V])
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def
saveAsSequenceFile(path: String, codec: Option[Class[_ <: CompressionCodec]] = None): Unit
Output the RDD as a Hadoop SequenceFile using the Writable types we infer from the RDD's key and value types.
Output the RDD as a Hadoop SequenceFile using the Writable types we infer from the RDD's key and value types. If the key or value are Writable, then we use their classes directly; otherwise we map primitive types such as Int and Double to IntWritable, DoubleWritable, etc, byte arrays to BytesWritable, and Strings to Text. The
path
can be on any Hadoop-supported file system. -
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