Anu Engineer created HADOOP-13935:
-------------------------------------
Summary: A command to print JAVA_VERSION used by Hadoop/HDFS
Key: HADOOP-13935
URL: https://issues.apache.org/jira/browse/HADOOP-13935
Project: Hadoop Common
Issue Type: Improvement
Components: common
Affects Versions: 3.0.0-alpha2
Reporter: Anu Engineer
The java version used by hadoop is controlled by JAVA_HOME variable defined in
hadoop_env.sh. We log this information when HDFS starts in the log file.
{noformat}
STARTUP_MSG: java = 1.8.0_112
{noformat}
However, it is quite possible that a user might have many versions of java
installed on his/her machine. Generally, users tend to check for the java
version via
{noformat}
java -version
{noformat}
This just means we are printing out the java version in the current shell path.
This jira proposes adding a new simple command or an extension to existing
hadoop version command where the current java version used by hadoop is also
printed out.
This avoids customer confusion when they are looking at if the java stack is
properly configured. For example, checking if JCE is installed correctly.
This is a very minor change that can be done by modifying hdfs.cmd or hdfs
shell script in the /bin directory. Thanks to [~sujit] for bringing this to my
attention.
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