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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13935) A command to print JAVA_VERSION used by Hadoop/HDFS
Date Fri, 23 Dec 2016 11:02:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15772554#comment-15772554

Allen Wittenauer commented on HADOOP-13935:

bq. Why not document this change in hadoop, hdfs, mapreduce, yarn documentations? 

It slipped by, mainly.  FWIW: hdfs envvars actually did get documented, but the rest didn't.

> 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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