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title: Distributed File Polling
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product: Mule Runtime
version: 4.3
keywords: file polling, cluster
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# Distributed File Polling

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

**_Enterprise Edition_**

Some connectors, such as the File connector or FTP connector, poll directories and read certain
files as they are created in the directories polled. These files can reside on a remote file system,
including file systems of nodes belonging to a Mule High Availability (HA) Cluster.

In Mule 4, distributed file polling makes it possible to poll files in all cluster nodes. Enabled by
default, this feature is used by the following connectors:

- [File Connector](https://docs.mulesoft.com/file-connector/latest/)

- [FTP Connector](https://docs.mulesoft.com/ftp-connector/latest/)

- [SFTP Connector](https://docs.mulesoft.com/sftp-connector/latest/)

You can configure connectors to only poll from the primary node, `@PrimaryNodeOnly`, which ignores
the default setting set by the Mule runtime engine. This feature is only available in Mule 4.x

## See Also

- [Creating and Managing a Cluster Manually](https://docs.mulesoft.com/on-premises/latest/creating-and-managing-a-cluster-manually)

- [Mule High Availability (HA) Cluster](https://docs.mulesoft.com/on-premises/latest/mule-high-availability-ha-clusters)

- [Migrating File Connector](https://docs.mulesoft.com/mule-runtime/4.3/migration-connectors-file)

- [Migrating FTP and SFTP Connectors](https://docs.mulesoft.com/mule-runtime/4.3/migration-connectors-ftp-sftp)