I have read some comments about setting JAVA_HOME. As I am a beginner in this,I did not edit anything without any knowledge of what I was doing. I did not want to mess things up more than this. So if you can guide me through this and tell me what is wrong with my coding, I would really appreciate it.
I have been trying to install Hadoop and then HBase. After a lot of difficulties and error solving, I could finally install Hadoop, and get the this output when I ran start-all.sh
and everything seemed to be fine.
> hduser@CSLAP106:~$ /usr/local/hadoop/bin/start-all.sh
> hduser@CSLAP106:~$ jps
> 3005 NameNode
> 3404 JobTracker
> 5570 Jps
> 3554 TaskTracker
> 3311 SecondaryNameNode
I also have this Java Version and when I type echo JAVA_HOME
, I get this output:
> hduser@CSLAP106:~$ java -version
>
> java version "1.7.0_25" OpenJDK Runtime Environment (IcedTea 2.3.12)
> (7u25-2.3.12-4ubuntu3) OpenJDK Server VM (build 23.7-b01, mixed
> mode)
> hduser@CSLAP106:~$ echo JAVA_HOME JAVA_HOME
After this, I tried to install HBase (which I think I am about to give up on), and constantly I get the error that JAVA_HOME is not set and java cannot be found
This is what I tried to start Hbase:
hduser@CSLAP106:~$ /usr/local/hbase/hbase-0.94.6.1/bin/start-hbase.sh
+======================================================================+
| Error: JAVA_HOME is not set and Java could not be found |
+----------------------------------------------------------------------+
| Please download the latest Sun JDK from the Sun Java web site |
| > http://java.sun.com/javase/downloads/ < |
| |
| HBase requires Java 1.6 or later. |
| NOTE: This script will find Sun Java whether you install using the |
| binary or the RPM based installer. |
+======================================================================+
I also check in this directory /usr/local/hbase/hbase-0.94.6.1/bin
to see if it recognizes Java or not, and it does!
After searching through Strackoverflow and other people's answers to the same problem, I tried to apply them to my .xml and .sh files, but again nothing happened.
For HADOOP
this is the hadoop-env.sh
in which I set the JAVA_HOME:
# The java implementation to use. Required.
export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i386
This is the editing for my $HOME/.bashrc
:
# Set Hadoop-related environment variables
export HADOOP_HOME=/usr/local/hadoop
export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-i386
# Add Hadoop bin/ directory to PATH
export PATH=$PATH:$HADOOP_HOME/bin
For HBase
These are the edits I have made in hbase-site.xml
<property>
<name>hbase.rootdir</name>
<value>hdfs://localhost:54310 /hbase</value>
</property>
This is for the hbase-env.sh
# The java implementation to use. Java 1.6 required.
# export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-i386
This is all I guess.
Apparently the HBase could not find JAVA_HOME and java binary although you can run java -version
locally.
You should run export JAVA_HOME=/the/path/of/you/jdk/
before running HBase.
BTY, echo JAVA_HOME JAVA_HOME
is incorrect. You may want echo $JAVA_HOME
.
Hbase tries to read JAVA_HOME directory set on hbase-env.sh file.
In hbase-env.sh file
export JAVA_HOME=/usr/java/jdk1.6.0/ is set and commented.
Default JAVA_HOME set for hbase.
If you set java home in different directory please edit the line and comment out it.
It will solve your problem.
Please refer to below:
"Java needs to be installed and available. If you get an error indicating that Java is not installed, but it is on your system, perhaps in a non-standard location, edit the conf/hbase-env.sh file and modify the JAVA_HOME setting to point to the directory that contains bin/java your system."
The link is http://hbase.apache.org/book/quickstart.html
If you have already set JAVA_HOME path in ~/.bashrc file and still Hbase is giving the same error of "JAVA_HOME not found", set JAVA_HOME in /etc/environment file.
I face this issue and it worked for me when i set JAVA_HOME in '/etc/environment'
Just modify hbase-env.sh
like this:
export JAVA_HOME=/your/java/path
I don't know why /etc/profile
java path doesn't work, but this way would help you.
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