# HDFS

### HDFS

Once hadoop single node cluster has been setup it’s time to initialize HDFS file system by formatting the /mnt/common/hdfs/namenode storage directory with the following command:

$ hdfs namenode -format

Now ready to start Hadoop instance. Before starting, recommend you to log out and log back in to update the environment variables.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://george-jen.gitbook.io/data-science-and-apache-spark/hdfs.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.