Hadoop Could not find or load main class - hadoop

Question

i try to install hadoop from this video
https://www.youtube.com/watch?v=CtOhsZ0Sb1E&t=126s
When i run the last command
start-all.sh
i got this message:
This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh
Starting namenodes on [localhost]
localhost: namenode running as process 6283. Stop it first.
localhost: starting datanode, logging to /home/myname/hadoop- 2.7.3/logs/hadoop-myname-datanode-MYNAME.out
Starting secondary namenodes [0.0.0.0]
0.0.0.0: secondarynamenode running as process 6379. Stop it first.
starting yarn daemons
starting resourcemanager, logging to /home/myname/hadoop- 2.7.3/logs/yarn-myname-resourcemanager-MYNAME.out
Error: Could not find or load main class org.apache.hadoop.yarn.server.resourcemanager.ResourceManager
localhost: starting nodemanager, logging to /home/myname/hadoop- 2.7.3/logs/yarn-myname-nodemanager-MYNAME.out
localhost: Error: Could not find or load main class org.apache.hadoop.yarn.server.nodemanager.NodeManager
my bashrc file
export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
export HADOOP_INSTALL=/home/myname/hadoop-2.7.3
export PATH=$PATH:$HADOOP_INSTALL/bin
export PATH=$PATH:$HADOOP_INSTALL/sbin
export HADOOP_MAPRED_HOME=$HADOOP_INSTALL
export HADOOP_COMMON_HOME=$HADOOP_INSTALL
export HADOOP_HDFS_HOME=$HADOOP_INSTALL
export YARN_HOME=$HADOOP_INSTALL
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_INSTALL/lib/native
export HADOOP_OPTS="-Djava.library.path=$HADOOP_INSTALL/lib/native"
my hdfs-site.xml
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
<description>Default block replication.
The actual number of replications can be specified when the file is created.
The default is used if replication is not specified in create time.
</description>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:/home/myname/hadoop-2.7.3/etc/hadoop/hadoop_store/hdfs/namenode</value>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>file:/home/myname/hadoop-2.7.3/etc/hadoop/hadoop_store/hdfs/datanode</value>
</property>
</configuration>
my core-site.xml
<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/home/myname/hadoop-2.7.3/tmp</value>
<description>A base for other temporary directories.</description>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:54310</value>
<description>The name of the default file system. A URI whose
scheme and authority determine the FileSystem implementation. The
uri's scheme determines the config property (fs.SCHEME.impl) naming
the FileSystem implementation class. The uri's authority is used to
determine the host, port, etc. for a filesystem.</description>
</property>
</configuration>
my mapred-site.xml
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>localhost:54311</value>
<description>The host and port that the MapReduce job tracker runs
at. If "local", then jobs are run in-process as a single map
and reduce task.
</description>
</property>
</configuration>
I have tried a lot of things but the error is still there..
Any idea ?

Answer 1

Add the following line to your .bashrc file:
export HADOOP_PREFIX=/path_to_hadoop_location

Answer 2

You have to include yarn-site.xml file while configuring hadoop
<configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
</configuration>
mapred-site.xml : add this also
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
I think you can resolve this issue by adding these properties.