Binary Files

Preview

  • This feature is in Public Preview.
  • The binary file data source will be available in the next major release of Apache Spark. Azure Databricks backported the feature from the Apache Spark master branch as a technical preview.

Databricks Runtime 5.4 and above support the binary file data source, which reads binary files and converts each file into a single record that contains the raw content and metadata of the file. The binary file data source produces a DataFrame with the following columns and possibly partition columns:

  • path (StringType): The path of the file.
  • modificationTime (TimestampType): The modification time of the file. In some Hadoop FileSystem implementations, this parameter might be unavailable and the value would be set to a default value.
  • length (LongType): The length of the file in bytes.
  • content (BinaryType): The content of the file.

To read binary files, specify the data source format as binaryFile.

Options

To load files with paths matching a given glob pattern while keeping the behavior of partition discovery, you can use the pathGlobFilter option. The following code reads all JPG files from the input directory with partition discovery:

df = spark.read.format("binaryFile").option("pathGlobFilter", "*.jpg").load("/path/to/dir")

If you want to ignore partition discovery and recursively search files under the input directory, Databricks Runtime 5.5 and above support the recursiveFileLookup option. This option searches through nested directories even if their names do not follow a partition naming scheme like date=2019-07-01. The following code reads all JPG files recursively from the input directory and ignores partition discovery:

df = spark.read.format("binaryFile") \
  .option("pathGlobFilter", "*.jpg") \
  .option("recursiveFileLookup", "true") \
  .load("/path/to/dir")

Similar APIs exist for Scala, Java, and R.

Note

To improve read performance when you load data back, Azure Databricks recommends turning off compression when you save data loaded from binary files:

spark.conf.set("spark.sql.parquet.compression.codec", "uncompressed")
df.write.format("delta").save("/path/to/table")