org.apache.beam.sdk.options

Interface PipelineOptions

All Superinterfaces:

HasDisplayData

All Known Subinterfaces:

ApplicationNameOptions, BigQueryOptions, GcpOptions, GcsOptions, GoogleApiDebugOptions, PubsubOptions, StreamingOptions, TestPipelineOptions

@ThreadSafe
public interface PipelineOptions
extends HasDisplayData

PipelineOptions are used to configure Pipelines. You can extend PipelineOptions to create custom configuration options specific to your Pipeline, for both local execution and execution via a PipelineRunner.

PipelineOptions and their subinterfaces represent a collection of properties which can be manipulated in a type safe manner. PipelineOptions is backed by a dynamic Proxy which allows for type safe manipulation of properties in an extensible fashion through plain old Java interfaces.

PipelineOptions can be created with PipelineOptionsFactory.create() and PipelineOptionsFactory.as(Class). They can be created from command-line arguments with PipelineOptionsFactory.fromArgs(String[]). They can be converted to another type by invoking as(Class) and can be accessed from within a DoFn by invoking DoFn.Context.getPipelineOptions().

For example:

 // The most common way to construct PipelineOptions is via command-line argument parsing:
 public static void main(String[] args) {
   // Will parse the arguments passed into the application and construct a PipelineOptions
   // Note that --help will print registered options, and --help=PipelineOptionsClassName
   // will print out usage for the specific class.
   PipelineOptions options =
       PipelineOptionsFactory.fromArgs(args).create();

   Pipeline p = Pipeline.create(options);
   ...
   p.run();
 }

 // To create options for the DirectRunner:
 DirectOptions directRunnerOptions =
     PipelineOptionsFactory.as(DirectOptions.class);

 // To cast from one type to another using the as(Class) method:
 DataflowPipelineOptions dataflowPipelineOptions =
     directPipelineOptions.as(DataflowPipelineOptions.class);

 // Options for the same property are shared between types
 // The statement below will print out "true"
 System.out.println(dataflowPipelineOptions.isStreaming());

 // Prints out registered options.
 PipelineOptionsFactory.printHelp(System.out);

 // Prints out options which are available to be set on DataflowPipelineOptions
 PipelineOptionsFactory.printHelp(System.out, DataflowPipelineOptions.class);
 

Defining Your Own PipelineOptions

Defining your own PipelineOptions is the way for you to make configuration options available for both local execution and execution via a PipelineRunner. By having PipelineOptionsFactory as your command-line interpreter, you will provide a standardized way for users to interact with your application via the command-line.

To define your own PipelineOptions, you create an interface which extends PipelineOptions and define getter/setter pairs. These getter/setter pairs define a collection of JavaBean properties.

For example:

  // Creates a user defined property called "myProperty"
  public interface MyOptions extends PipelineOptions {
    String getMyProperty();
    void setMyProperty(String value);
  }
 

Note: Please see the section on Registration below when using custom property types.

Restrictions

Since PipelineOptions can be "cast" to multiple types dynamically using as(Class), a property must conform to the following set of restrictions:

• Any property with the same name must have the same return type for all derived interfaces of PipelineOptions.
• Every bean property of any interface derived from PipelineOptions must have a getter and setter method.
• Every method must conform to being a getter or setter for a JavaBean.
• The derived interface of PipelineOptions must be composable with every interface part registered with the PipelineOptionsFactory.
• Only getters may be annotated with @JsonIgnore.
• If any getter is annotated with @JsonIgnore, then all getters for this property must be annotated with @JsonIgnore.

Annotations For PipelineOptions

@Description can be used to annotate an interface or a getter with useful information which is output when --help is invoked via PipelineOptionsFactory.fromArgs(String[]).

@Default represents a set of annotations that can be used to annotate getter properties on PipelineOptions with information representing the default value to be returned if no value is specified. Any default implementation (using the default keyword) is ignored.

@Hidden hides an option from being listed when --help is invoked via PipelineOptionsFactory.fromArgs(String[]).

@Validation represents a set of annotations that can be used to annotate getter properties on PipelineOptions with information representing the validation criteria to be used when validating with the PipelineOptionsValidator. Validation will be performed if during construction of the PipelineOptions, PipelineOptionsFactory.withValidation() is invoked.

@JsonIgnore is used to prevent a property from being serialized and available during execution of DoFn. See the Serialization section below for more details.

Registration Of PipelineOptions

Registration of PipelineOptions by an application guarantees that the PipelineOptions is composable during execution of their Pipeline and meets the restrictions listed above or will fail during registration. Registration also lists the registered PipelineOptions when --help is invoked via PipelineOptionsFactory.fromArgs(String[]).

Registration can be performed by invoking PipelineOptionsFactory.register(java.lang.Class<? extends org.apache.beam.sdk.options.PipelineOptions>) within a users application or via automatic registration by creating a ServiceLoader entry and a concrete implementation of the PipelineOptionsRegistrar interface.

It is optional but recommended to use one of the many build time tools such as AutoService to generate the necessary META-INF files automatically.

A list of registered options can be fetched from PipelineOptionsFactory.getRegisteredOptions().

Serialization Of PipelineOptions

PipelineRunners require support for options to be serialized. Each property within PipelineOptions must be able to be serialized using Jackson's ObjectMapper or the getter method for the property annotated with @JsonIgnore.

Jackson supports serialization of many types and supports a useful set of annotations to aid in serialization of custom types. We point you to the public Jackson documentation when attempting to add serialization support for your custom types. See GoogleApiDebugOptions.GoogleApiTracer for an example using the Jackson annotations to serialize and deserialize a custom type.

Note: It is an error to have the same property available in multiple interfaces with only some of them being annotated with @JsonIgnore. It is also an error to mark a setter for a property with @JsonIgnore.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	PipelineOptions.CheckEnabled Enumeration of the possible states for a given check.
static class	PipelineOptions.DirectRunner A DefaultValueFactory that obtains the class of the DirectRunner if it exists on the classpath, and throws an exception otherwise.

Method Summary

Modifier and Type	Method and Description
<T extends PipelineOptions> T	as(Class<T> kls) Transforms this object into an object of type <T> saving each property that has been manipulated.
<T extends PipelineOptions> T	cloneAs(Class<T> kls) Makes a deep clone of this object, and transforms the cloned object into the specified type kls.
Class<? extends PipelineRunner<?>>	getRunner() The pipeline runner that will be used to execute the pipeline.
PipelineOptions.CheckEnabled	getStableUniqueNames() Whether to check for stable unique names on each transform.
String	getTempLocation() A pipeline level default location for storing temporary files.
void	setRunner(Class<? extends PipelineRunner<?>> kls)
void	setStableUniqueNames(PipelineOptions.CheckEnabled enabled)
void	setTempLocation(String value)

Methods inherited from interface org.apache.beam.sdk.transforms.display.HasDisplayData

populateDisplayData

Method Detail

as

<T extends PipelineOptions> T as(Class<T> kls)

Transforms this object into an object of type <T> saving each property that has been manipulated. <T> must extend PipelineOptions.

If <T> is not registered with the PipelineOptionsFactory, then we attempt to verify that <T> is composable with every interface that this instance of the PipelineOptions has seen.

Parameters:

kls - The class of the type to transform to.

Returns:

An object of type kls.

cloneAs

<T extends PipelineOptions> T cloneAs(Class<T> kls)

Makes a deep clone of this object, and transforms the cloned object into the specified type kls. See as(java.lang.Class<T>) for more information about the conversion.

Properties that are marked with @JsonIgnore will not be cloned.

getRunner

@Validation.Required
 @Default.InstanceFactory(value=PipelineOptions.DirectRunner.class)
Class<? extends PipelineRunner<?>> getRunner()

The pipeline runner that will be used to execute the pipeline. For registered runners, the class name can be specified, otherwise the fully qualified name needs to be specified.

setRunner

void setRunner(Class<? extends PipelineRunner<?>> kls)

getStableUniqueNames

@Validation.Required
 @Default.Enum(value="WARNING")
PipelineOptions.CheckEnabled getStableUniqueNames()

Whether to check for stable unique names on each transform. This is necessary to support updating of pipelines.

setStableUniqueNames

void setStableUniqueNames(PipelineOptions.CheckEnabled enabled)

getTempLocation

String getTempLocation()

A pipeline level default location for storing temporary files.

This can be a path of any file system.

getTempLocation() can be used as a default location in other PipelineOptions.

If it is unset, PipelineRunner can override it.

setTempLocation

void setTempLocation(String value)