This processor creates FlowFiles with records having random value for the specified fields. GenerateRecord is useful for testing, configuration, and simulation. It uses either user-defined properties to define a record schema or a provided schema and generates the specified number of records using random data for the fields in the schema.


test, random, generate, fake


In the list below, the names of required properties appear in bold. Any other properties (not in bold) are considered optional. The table also indicates any default values, and whether a property supports the NiFi Expression Language.

Display NameAPI NameDefault ValueAllowable ValuesDescription
Record Writerrecord-writerController Service API:
Implementations: AvroRecordSetWriter
Specifies the Controller Service to use for writing out the records
Number of Recordsnumber-of-records100Specifies how many records will be generated for each outgoing FlowFile.
Supports Expression Language: true (will be evaluated using variable registry only)
Nullable Fieldsnullable-fieldstrue
  • true
  • false
Whether the generated fields will be nullable. Note that this property is ignored if Schema Text is set. Also it only affects the schema of the generated data, not whether any values will be null. If this property is true, see 'Null Value Percentage' to set the probability that any generated field will be null.
Null Value Percentagenull-percentage0The percent probability (0-100%) that a generated value for any nullable field will be null. Set this property to zero to have no null values, or 100 to have all null values.
Supports Expression Language: true (will be evaluated using variable registry only)

This Property is only considered if the [Nullable Fields] Property has a value of "true".
Schema Textschema-textThe text of an Avro-formatted Schema used to generate record data. If this property is set, any user-defined properties are ignored.
Supports Expression Language: true (will be evaluated using variable registry only)

Dynamic Properties:

Supports Sensitive Dynamic Properties: No

Dynamic Properties allow the user to specify both the name and value of a property.

Field name in generated recordFaker category for generated record valuesCustom properties define the generated record schema using configured field names and value data types in absence of the Schema Text property
Supports Expression Language: false


successFlowFiles that are successfully created will be routed to this relationship

Reads Attributes:

None specified.

Writes Attributes:

mime.typeSets the mime.type attribute to the MIME Type specified by the Record Writer
record.countThe number of records in the FlowFile

State management:

This component does not store state.


This component is not restricted.

Input requirement:

This component does not allow an incoming relationship.

System Resource Considerations:

None specified.