Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3803#discussion_r23881453
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala ---
@@ -372,6 +392,33 @@ class StreamingContext private[streaming] (
}
/**
+ * Create an input stream that monitors a Hadoop-compatible filesystem
+ * for new files and reads them as flat binary files, assuming a fixed
length per record,
+ * generating one byte array per record. Files must be written to the
monitored directory
+ * by "moving" them from another location within the same file system.
File names
+ * starting with . are ignored.
+ *
+ * '''Note:''' Normally getBytes returns an array padded with extra
values,
+ * but the FixedLengthBinaryInputFormat ensures that it will always be
backed
+ * by a byte array of the correct length (the recordLength)
+ *
+ * @param directory HDFS directory to monitor for new file
+ * @param recordLength length of each record in bytes
+ */
+ def binaryRecordsStream(
+ directory: String,
+ recordLength: Int): DStream[Array[Byte]] = {
+ val conf = sc_.hadoopConfiguration
+ conf.setInt(FixedLengthBinaryInputFormat.RECORD_LENGTH_PROPERTY,
recordLength)
+ val br = fileStream[LongWritable, BytesWritable,
FixedLengthBinaryInputFormat](directory, conf)
+ val data = br.map{ case (k, v) =>
+ val bytes = v.getBytes
+ assert(bytes.length == recordLength, "Byte array does not have
correct length")
+ bytes}
--- End diff --
Same style nit applies in this file, too.
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