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From "Lohit Vijayarenu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5232) log classpath and other key properties on child JVM start
Date Fri, 10 May 2013 03:19:17 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13653506#comment-13653506

Lohit Vijayarenu commented on MAPREDUCE-5232:

Patch looks good. Two minor things I could think of
    if (conf.getBoolean(MRJobConfig.MAPREDUCE_CHILD_LOG_PROPERTIES_ON_START, false)) {
Default define in .xml is true, while code works on false. Code should probably reflect what
is in default.xml

2. Instead of having 2 separate configs, we can get away with just mapreduce.child.log.properties.
If that is set, then we log, if that is empty, then the feature is disable. 

> log classpath and other key properties on child JVM start
> ---------------------------------------------------------
>                 Key: MAPREDUCE-5232
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5232
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv1, mrv2
>    Affects Versions: 2.0.4-alpha
>            Reporter: Sangjin Lee
>         Attachments: MAPREDUCE-5232-branch-2.patch, MAPREDUCE-5232.patch
> It would be great if we log vital information such as classpath, etc. upon a mapreduce
child JVM start. This would help a great deal in terms of troubleshooting classpath issues,
etc. Today it is pretty difficult to debug this unless you preserve the container script.
> Maybe it can log things like classpath, os name/version, java version, etc. at the beginning
of the child JVM start.

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