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https://issues.apache.org/jira/browse/HADOOP-11081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14138140#comment-14138140
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Allen Wittenauer commented on HADOOP-11081:
-------------------------------------------

{code}
#
# NOTE: HADOOP_GC_SETTINGS is not used by default!  This is 
# an example of how to define variables and re-use them later on.
# For example, it is common to use the same garbage collection settings
# for all the daemons.  So one could define:
#
# export HADOOP_GC_SETTINGS="-verbose:gc -XX:+PrintGCDetails 
-XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps"
#
# .. and then use it as per the b option under the namenode.
{code}

better?

> Document hadoop properties expected to be set by the shell code in *-env.sh
> ---------------------------------------------------------------------------
>
>                 Key: HADOOP-11081
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11081
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: documentation, scripts
>            Reporter: Allen Wittenauer
>            Assignee: Allen Wittenauer
>              Labels: newbie
>         Attachments: HADOOP-11081-01.patch, HADOOP-11081-02.patch, 
> HADOOP-11081.patch
>
>
> There are quite a few Java properties that are expected to be set by the 
> shell code. These are currently undocumented.  



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