After installation of Hadoop cluster in a single node, we getting while starting daemons with below error:
sreekanth@sreekanth-Inspiron-5537:~$ start-all.sh This script is Deprecated. Instead, use start-dfs.sh and start-yarn.sh Error: JAVA_HOME is not set and could not be found.
Error: JAVA_HOME is not set and could not be found.
How to set JAVA_HOME in Linux or Ubuntu in a simple manner while installation of the Hadoop eco-system.
Step1: Goto Java library path like below:
Step 2: Open bashrc then update the JAVA_HOME environment variables simply.
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-amd64 export PATH=$PATH:$JAVA_HOME/bin
Step 3: After that update the hadoop env file in below path:
then go to hadoop-env.sh file then update JAVA_HOME path into that hadoop-env.sh file like below
Step4: After completion of all steps then open terminal then checks all daemons using below command:
sreekanth@sreekanth-Inspiron-5537:~$ start-all.sh This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh Starting namenodes on [localhost] sreekanth@localhost's password: localhost: starting namenode, logging to /home/sreekanth/Hadoop/hadoop-2.6.0/logs/hadoop-sreekanth-namenode-sreekanth-Inspiron-5537.out sreekanth@localhost's password: localhost: starting datanode, logging to /home/sreekanth/Hadoop/hadoop-2.6.0/logs/hadoop-sreekanth-datanode-sreekanth-Inspiron-5537.out Starting secondary namenodes [0.0.0.0] firstname.lastname@example.org's password: 0.0.0.0: starting secondarynamenode, logging to /home/sreekanth/Hadoop/hadoop-2.6.0/logs/hadoop-sreekanth-secondarynamenode-sreekanth-Inspiron-5537.out starting yarn daemons starting resourcemanager, logging to /home/sreekanth/Hadoop/hadoop-2.6.0/logs/yarn-sreekanth-resourcemanager-sreekanth-Inspiron-5537.out sreekanth@localhost's password: localhost: starting nodemanager, logging to /home/sreekanth/Hadoop/hadoop-2.6.0/logs/yarn-sreekanth-nodemanager-sreekanth-Inspiron-5537.out