# Hadoop
The platform uses Hadoop HDFS as a file system for Spark. For web-ui access to it use [the hadoop-name node address defined in the inventory file](https://github.com/nlesc-sherlock/emma/blob/master/ansible.md#provision) which is listening on port **50070**.

To have password less ssh connections between nodes for the hadoop user, it is necessary to generate a ssh-key with the name **id_rsa**. It should be stored under **files** in the **hadoop** role.
```
cd roles/hadoop/files/
ssh-keygen -t rsa
```

# Hadoop
The platform uses Hadoop HDFS as a file system for Spark. For web-ui access to it use [the hadoop-name node address defined in the inventory file](https://github.com/nlesc-sherlock/emma/blob/master/ansible.md#provision) which is listening on port **50070**.

For setting up Hadoop on a cluster of machines, the master should be able to do a password-less ssh to start the daemons on all the slaves. Hence, the user should generate a ssh-key with the name **id_rsa** and the key be stored under **files** in the **hadoop** role.
```
cd roles/hadoop/files/
ssh-keygen -t rsa
```

Improve the text description for the ssh-key generation.
Improve the text description for the ssh-key generation.