Hadoop: Cannot use Jps command

Question

The problem is

  hduser@saket-K53SM:/usr/local/hadoop$ jps
  The program \'jps\' can be found in the following packages:
  * openjdk-6-jdk
  * openjdk-7-jdk
         


        

Answer 1

This problem is caused since you have installed JDK from Oracle (may be). You can fix this problem by using update-alternatives program to link jps to standard path directory. Use this command to fix this in a terminal

 sudo update-alternatives --install /usr/bin/jps jps /usr/lib/jvm/jdk1.6/bin/jps 1

Use the actual jps program path in the appropriate jdk (your version of jdk) instead of jdk1.6 which is specific to me. Hope this will help.

Answer 2

on CentOS7, I fixed that problem when I installed java-devel

# yum install java-1.8.0-openjdk-devel.x86_64

Answer 3

did you install the package java-1.6.0-openjdk-devel who provides the jps tool?

$ sudo yum provides /usr/lib/jvm/java-1.6.0-openjdk.x86_64/bin/jps
Loaded plugins: product-id, subscription-manager
Updating certificate-based repositories.
Unable to read consumer identity
1:java-1.6.0-openjdk-devel-1.6.0.0-1.45.1.11.1.el6.x86_64 : OpenJDK Development Environment
Repo        : installed
Matched from:
Other       : Provides-match: /usr/lib/jvm/java-1.6.0-openjdk.x86_64/bin/jps

Answer 4

JPS seems (on amx linux 64 / centos at least) to be available via ant.

sudo yum install ant

and you can run jps

Answer 5

Use this command if you cannot use jps

ps -aux | grep java | awk '{print $12}'

It will show files as:

Answer 6

That is actually not a Hadoop problem. Hadoop does not use JPS.

If JPS can't be found, you have to put it into your path or create an alias. The JPS executable can be found under $JAVA_HOME/bin/jps.

The alias for example could be:

alias jps='/usr/lib/jvm/jdk1.6.0_33/bin/jps'

Or if you don't care about using JPS, you could instead do a

ps aux | grep java

which will approx. give you the same result ;)