[jira] [Resolved] (HADOOP-13935) A command to print JAVA_VERSION used by Hadoop/HDFS

["Anu Engineer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-13935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Anu Engineer resolved HADOOP-13935.
-----------------------------------
    Resolution: Implemented

This feature is already implemented via envvars command, which is part of HADOOP-12366

> 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
>            Assignee: Yiqun Lin
>              Labels: newbie
>
> 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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