Failed to start namenode in hadoop?

Change your following properties from:

<property>   <name>dfs.namenode.name.dir</name>   <value>C:/hadoop/data/namenode</value></property><property>   <name>dfs.datanode.data.dir</name>   <value>C:/hadoop/data/datanode</value></property>

To:

<property>   <name>dfs.namenode.name.dir</name>   <value>/hadoop/data/namenode</value></property><property>   <name>dfs.datanode.data.dir</name>   <value>/hadoop/data/datanode</value></property>

For windows, directories should be similar to this format /c:/path/to/dir or file:///D:/path/to/dir:

I've tried using "/hadoop/data/namenode" which prevents starting namenode due to non existence of specified namenode directory .. I have found it is storing files in c drive when using "/hadoop/data/namenode" but while starting dfs it is gonna resolve paths relatively to the drive where hadoop source is residing.

I have switch to use the following and it worked fine:

<property>   <name>dfs.namenode.name.dir</name>   <value>/d:/hadoop/data/namenode</value></property><property>   <name>dfs.datanode.data.dir</name>   <value>/d:/hadoop/data/datanode</value></property>

Hint: Don't forget the prefix slash before drive name /d:/

I was able to solve this issue by adding namenode and datanode in hadoop root location and using

<property>    <name>dfs.namenode.name.dir</name>    <value>F:\hadoop-2.7.2\data\namenode</value></property>

Instead of using backward slash, use the forward slashesF:/hadoop-2.7.2/data/namenodeAlternatively make it a valid URIfile:///f:/hadoop-2.7.2/data/namenode