# HDFS

## HDFS segment fetcher configs

In your Pinot controller/server configuration, you will need to provide the following configs:

```
pinot.controller.segment.fetcher.hdfs.hadoop.conf.path=`<file path to hadoop conf folder>
```

or

```
pinot.server.segment.fetcher.hdfs.hadoop.conf.path=`<file path to hadoop conf folder>
```

This path should point the local folder containing `core-site.xml` and `hdfs-site.xml` files from your Hadoop installation

```
pinot.controller.segment.fetcher.hdfs.hadoop.kerberos.principle=`<your kerberos principal>
pinot.controller.segment.fetcher.hdfs.hadoop.kerberos.keytab=`<your kerberos keytab>
```

or

```
pinot.server.segment.fetcher.hdfs.hadoop.kerberos.principle=`<your kerberos principal>
pinot.server.segment.fetcher.hdfs.hadoop.kerberos.keytab=`<your kerberos keytab>
```

These two configs should be the corresponding Kerberos configuration if your Hadoop installation is secured with Kerberos. Please check Hadoop Kerberos guide on how to generate Kerberos security identification.

You will also need to provide proper Hadoop dependencies jars from your Hadoop installation to your Pinot startup scripts.

## Push HDFS segment to Pinot Controller

To push HDFS segment files to Pinot controller, you just need to ensure you have proper Hadoop configuration as we mentioned in the previous part. Then your remote segment creation/push job can send the HDFS path of your newly created segment files to the Pinot Controller and let it download the files.

For example, the following curl requests to Controller will notify it to download segment files to the proper table:

```
curl -X POST -H "UPLOAD_TYPE:URI" -H "DOWNLOAD_URI:hdfs://nameservice1/hadoop/path/to/segment/file.
```


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