NiFi Ingest 26.3
NiFi Ingest

# AutoCategorizeGenerator

A processor that identifies potential categories in the documents that it sees.

The processor allows indexing of documents into a Content component in batches (you can configure the size of the batches). After Content has fully indexed a batch, this processor attempts to cluster the documents in the index. If clustering reaches a stable state, the processor creates categories that the AutoCategorizeLabeller processor can use to categorize documents.

## Properties

Name | Default Value | Description
--- | --- | ---
Category Host |  | The host of the Category component to use to categorize documents.
Category Port |  | The port of the Category component to use to categorize documents.
Min Categories | 9 | The minimum number of categories to create (this value is also the minimum number of clusters to identify in the ingested documents).
Stability Factor | 0.8 | The minimum proportion of clusters (between 0.0 and 1.0) that must persist across consecutive steps of the clustering process for it to be regarded as stable.
Batch Timeout | 60 | The maximum number of seconds allowed for an index document batch to complete.
Batch Size | 1000 | The number of documents in an index document batch.
Max Unstable Docs | 10000 | The number of documents after which the process is abandonded if clustering is not stable.
Distributed Cache Service |  | The identifier of the Distributed Cache Service used to communicate state between the AutoCategorizeGenerator processor and the AutoCategorizeLabeller processor.

NOTE: The template does not include the `DistributedMapCacheServer` controller service that is required to make it work. You must set one of these up yourself in your NiFi ingestion process, and configure both processors to use it.

The `DistributedMapCacheServer` is a standard NiFi service. For more information, see https://nifi.apache.org/docs/nifi-docs/components/org.apache.nifi/nifi-distributed-cache-services-nar/1.5.0/org.apache.nifi.distributed.cache.server.map.DistributedMapCacheServer/index.html.

## Relationships

Name | Description
--- | ---
success | Successfully processed FlowFiles are routed to this relationship.

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Version 26.3 | Last updated July 2026

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Product: Knowledge Discovery NiFi Ingest 26.3

Topic Title: AutoCategorizeGenerator