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Parquet Output


The Parquet Output step allows you to map PDI fields to fields within data files and choose where you want to process those files, such as on HDFS. For big data users, the Parquet Input and Parquet Output steps enable you to gather data from various sources and move that data into the Hadoop ecosystem in the Parquet format.

Before using the Parquet Output step, you will need to configure a named connection for your distribution, even if your Location is set to Local. For information on named connections, see Connecting to a Hadoop cluster with the PDI client.



Enter the following information in the transformation step fields.

Option Description
Step name Specify the unique name of the Parquet Output step on the canvas. You can customize the name or leave it as the default.
Folder/File name Specify the location and name of the file or folder. Click Browse to display the Open dialog box and navigate to the destination file or folder. For the supported file system types, see Connecting to Virtual File Systems.
  • When running on the Pentaho engine, a single Parquet file is created.
Overwrite existing output file Select to overwrite an existing file that has the same file name and extension.



The Parquet Output step features two tabs with fields. Each tab is described below.

Fields tab

Parquet Output step

In the Fields tab, you can define properties for the fields being exported. The table below describes each of the options for configuring the field properties.

Property Description
Parquet Path Specify the name of the column in the Parquet file.
Name Specify the name of the PDI field.
Parquet Type Specify the data type used to store the data in the Parquet file.
Precision Specify the total number of significant digits in the number (only applies to the Decimal Parquet type). The default value is 20.
Scale Specify the number of digits after the decimal point (only applies to the Decimal Parquet type). The default value is 10.
Default value Specify the default value of the field if it is null or empty.
Null Specify if the field can contain null values.
NoteTo avoid a transformation failure, make sure the Default value field contains values for all fields where Null is set to No.

You can define the fields manually, or you can click Get Fields to automatically populate the fields. When the fields are retrieved, a PDI type is converted into an appropriate Parquet type, as shown in the table below. You can also change the selected Parquet type by using the Type drop-down or by entering the type manually.

PDI Type Parquet Type
InetAddress UTF8
String UTF8
TimeStamp TimestampMillis
Binary Binary
BigNumber Decimal
Boolean Boolean
Date Date
Integer Int64
Number Double

Options tab

Parquet Output step Options           tab

In the Options tab, you can define properties for the file output.

Option Description

Specify the codec to use to compress the Parquet Output file:

  • None

    No compression is used (default).

  • Snappy

    Using Google's Snappy compression library, writes the data blocks that are followed by the 4-byte, big-endian CRC32 checksum of the uncompressed data in each block.

  • GZIP

    Uses a compression format that is based on the Deflate algorithm.


Specify the version of Parquet you want to use:

  • Parquet 1.0
  • Parquet 2.0
Row group size (MB) Specify the group size for the rows. The default value is 0.
Data page size (KB) Specify the page size for the data. The default value is 0.
Dictionary encoding Specifies the dictionary encoding, which builds a dictionary of values encountered in a column. The dictionary page is written first, before the data pages of the column. Note that if the dictionary grows larger than the Page size, whether in size or number of distinct values, then the encoding method will revert to the plain encoding type.
Page size (KB) Specify the page size when using dictionary encoding. The default value is 1024.
Extension Select the extension for your output file. The default value is parquet.
Include date in file name Adds the system date to the filename with format yyyyMMdd (20181231 for example).
Include time in file name Adds the system time to the filename with format HHmmss (235959 for example).
Specify date time format Specify the date time format using the dropdown list.

Metadata injection support


All fields of this step support metadata injection. You can use this step with ETL metadata injection to pass metadata to your transformation at runtime.