---
title: "Apache Parquet I/O connector"
---
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[Built-in I/O Transforms](/documentation/io/built-in/)

# Apache Parquet I/O connector

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The Beam SDKs include built-in transforms that can read data from and write data
to [Apache Parquet](https://parquet.apache.org) files.

## Before you start

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To use ParquetIO, add the Maven artifact dependency to your `pom.xml` file.
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{{< highlight java >}}
<dependency>
    <groupId>org.apache.beam</groupId>
    <artifactId>beam-sdks-java-io-parquet</artifactId>
    <version>{{< param release_latest >}}</version>
</dependency>
{{< /highlight >}}

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Additional resources:
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* [ParquetIO source code](https://github.com/apache/beam/blob/master/sdks/java/io/parquet/src/main/java/org/apache/beam/sdk/io/parquet/ParquetIO.java)
* [ParquetIO Javadoc](https://beam.apache.org/releases/javadoc/{{< param release_latest >}}/org/apache/beam/sdk/io/parquet/ParquetIO.html)
{{< /paragraph >}}

<!-- Python specific -->

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ParquetIO comes preinstalled with the Apache Beam python sdk..{{< param release_latest >}}
{{< /paragraph >}}

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Additional resources:
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{{< paragraph class="language-py" wrap="span" >}}
* [ParquetIO source code](https://github.com/apache/beam/blob/master/sdks/python/apache_beam/io/parquetio.py)
* [ParquetIO Pydoc](https://beam.apache.org/releases/pydoc/{{< param release_latest >}}/apache_beam.io.parquetio.html)
{{< /paragraph >}}

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#### Using ParquetIO with Spark before 2.4
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`ParquetIO` depends on an API introduced in Apache Parquet 1.10.0.  **Spark 2.4.x is compatible and no additional steps are necessary**.  Older versions of Spark will not work out of the box since a pre-installed version of Parquet libraries will take precedence during execution.  The following workaround should be applied.
{{< /paragraph >}}

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> **Note**: The following technique allows you to execute your pipeline with `ParquetIO` correctly.
> The Parquet files that are consumed or generated by this Beam connector should remain interoperable with the other tools on your cluster.
{{< /paragraph >}}

{{< paragraph class="language-java" >}}
Include the Parquet artifact normally and ensure that it brings in the correct version of Parquet as a transitive dependency.
{{< /paragraph >}}

{{< highlight java >}}
<dependency>
    <groupId>org.apache.beam</groupId>
    <artifactId>beam-sdks-java-io-parquet</artifactId>
    <version>${beam.version}</version>
</dependency>
{{< /highlight >}}
 
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Relocate the following packages:
{{< /paragraph >}}

{{< highlight java >}}
<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-shade-plugin</artifactId>
  <configuration>
    <createDependencyReducedPom>false</createDependencyReducedPom>
    <filters>
      <filter>
        <artifact>*:*</artifact>
        <excludes>
          <exclude>META-INF/*.SF</exclude>
          <exclude>META-INF/*.DSA</exclude>
          <exclude>META-INF/*.RSA</exclude>
        </excludes>
      </filter>
    </filters>
  </configuration>
  <executions>
    <execution>
      <phase>package</phase>
      <goals>
        <goal>shade</goal>
      </goals>
      <configuration>
        <shadedArtifactAttached>true</shadedArtifactAttached>
        <shadedClassifierName>shaded</shadedClassifierName>
        <relocations>
          <relocation>
            <pattern>org.apache.parquet</pattern>
            <shadedPattern>shaded.org.apache.parquet</shadedPattern>
          </relocation>
          <!-- Some packages are shaded already, and on the original spark classpath. Shade them more. -->
          <relocation>
            <pattern>shaded.parquet</pattern>
            <shadedPattern>reshaded.parquet</shadedPattern>
          </relocation>
          <relocation>
            <pattern>org.apache.avro</pattern>
            <shadedPattern>shaded.org.apache.avro</shadedPattern>
          </relocation>
        </relocations>
        <transformers>
          <transformer
            implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
        </transformers>
      </configuration>
    </execution>
  </executions>
</plugin>
{{< /highlight >}}

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This technique has been tested to work on Spark 2.2.3, Spark 2.3.3 and Spark 2.4.3 (although it is optional for Spark 2.4+).
{{< /paragraph >}}
