# File Systems

FileSystem is an abstraction provided by Pinot to access data in distributed file systems (DFS).

Pinot uses distributed file systems for the following purposes:

* Batch Ingestion Job - To read the input data (CSV, Avro, Thrift, etc.) and to write generated segments to DFS
* Controller - When a segment is uploaded to the controller, the controller saves it in the DFS configured.
* Server - When a server(s) is notified of a new segment, the server copies the segment from remote DFS to their local node using the DFS abstraction.

## Supported File Systems

Pinot lets you choose a distributed file system provider. The following file systems are supported by Pinot:

* [Amazon S3](https://docs.pinot.apache.org/release-0.12.1/basics/data-import/pinot-file-system/amazon-s3)
* [Google Cloud Storage](https://docs.pinot.apache.org/release-0.12.1/basics/data-import/pinot-file-system/import-from-gcp)
* [HDFS](https://docs.pinot.apache.org/release-0.12.1/basics/data-import/pinot-file-system/import-from-hdfs)
* [Azure Data Lake Storage](https://docs.pinot.apache.org/release-0.12.1/basics/data-import/pinot-file-system/import-from-adls-azure)

## Enabling a File System

To use a distributed file system, you need to enable plugins. To do that, specify the plugin directory and include the required plugins -

```
-Dplugins.dir=/opt/pinot/plugins -Dplugins.include=pinot-plugin-to-include-1,pinot-plugin-to-include-2
```

Now, You can proceed to change the filesystem in the `controller` and `server` config as shown below:

```
#CONTROLLER

pinot.controller.storage.factory.class.[scheme]=className of the pinot file systems
pinot.controller.segment.fetcher.protocols=file,http,[scheme]
pinot.controller.segment.fetcher.[scheme].class=org.apache.pinot.common.utils.fetcher.PinotFSSegmentFetcher
```

```
#SERVER

pinot.server.storage.factory.class.[scheme]=className of the pinotfile systems
pinot.server.segment.fetcher.protocols=file,http,[scheme]
pinot.server.segment.fetcher.[scheme].class=org.apache.pinot.common.utils.fetcher.PinotFSSegmentFetcher
```

`scheme` refers to the prefix used in the URI of the filesystem. e.g. for the URI `s3://bucket/path/to/file` , the scheme is `s3`

You can also change the filesystem during ingestion. In the ingestion job spec, specify the filesystem with the following config:

```
pinotFSSpecs
  - scheme: file
    className: org.apache.pinot.spi.filesystem.LocalPinotFS
```


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