Just Use the command Hadoop version in Console.
You will get an output similar to this one.
Subversion http://svn.apache.org/repos/asf/hadoop/common -r 1583262
Compiled by jenkins on 2014-03-31T08:29Z
Compiled with protoc 2.5.0
From source with checksum 375b2832a6641759c6eaf6e3e998147
This command was run using /usr/local/hadoop/share/hadoop/common/hadoop-common-2.4.0.jar
The simplest way to check Hadoop version ...READ MORE
hdfs getconf -namenodes
Secondary name nodes:
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