Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3803#discussion_r22287997
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala ---
@@ -373,6 +393,25 @@ 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.
+ * @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) => v.getBytes}
--- End diff --
Maybe it's not an issue since we're using FixedLengthBinaryInputFormat, but
even if it isn't we should have a comment explaining why it's correct or a
defensive check that `getBytes` returns an array of the expected length.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
