What's the standard way to create files in your hdfs filesystem? - hadoop

Question

I learned that I have to configure the NameNode and DataNode dir in hdfs-site.xml. So that's my hdfs-site.xml configuration on the NameNode:
<configuration>
<property>
<name>dfs.replication</name>
<value>3</value>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>file://usr/local/hadoop-2.6.0/hadoop_data/hdfs/namenode</value>
</property>
<property>
<name>dfs.block.size</name>
<value>134217728</value>
</property>
</configuration>
I did almost the same on my DataNode and changed dfs.namenode to dfs.datanode.
Then I formatted the filesystem via
hadoop namenode -format
Everything seems to be finished without an error.
Then I wanted to create a directory in my HDFS filesystem by using:
hdfs dfs -mkdir test
And I got an error:
mkdir: `test': No such file or directory
What did I miss or what's the common process from formatting to creating files/directories with HDFS?

Answer 1

Well, it's so easy.
hdfs dfs -mkdir /test
was created successfully.
hdfs dfs -put myFile /test/myFile
works as well.

Answer 2

Create a directory:
hdfs dfs -mkdir directoryName
Create a new file in directory
hdfs dfs -touchz directoryName/Newfilename
Write into newly created file in HDFS
nano filename
Save it Cntr+X Y
Read the newly created file from HDFS
nano fileName
Or
hdfs dfs -cat directoryName/fileName

Answer 3

HDFS is a non POSIX compliant file systems so you can't edit files directly inside of HDFS, however you can Copy a file from your local system to HDFS using following command:
hdfs dfs -put /path/in/source/system/filename /path/in/HDFS/system/destination

Answer 4

If you want to create multiple sub-directories then you should also use -p flag:
hdfs dfs -mkdir -p /test/another_test/one_more_test