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https://issues.apache.org/jira/browse/MAPREDUCE-1697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12869615#action_12869615
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Hadoop QA commented on MAPREDUCE-1697:
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-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12445045/patch-1697.txt
  against trunk revision 946578.

    +1 @author.  The patch does not contain any @author tags.

    +0 tests included.  The patch appears to be a documentation patch that 
doesn't require tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac 
compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of 
release audit warnings.

    -1 core tests.  The patch failed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: 
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/540/testReport/
Findbugs warnings: 
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/540/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: 
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/540/artifact/trunk/build/test/checkstyle-errors.html
Console output: 
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/540/console

This message is automatically generated.

> Document the behavior of -file option in streaming
> --------------------------------------------------
>
>                 Key: MAPREDUCE-1697
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1697
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/streaming, documentation
>    Affects Versions: 0.20.1
>            Reporter: Amareshwari Sriramadasu
>             Fix For: 0.21.0, 0.22.0
>
>         Attachments: patch-1697.txt
>
>
> The behavior of -file option in streaming is not documented anywhere.
> The behavior of -file is the following :
> 1) All the files passed through  -file option are packaged into job.jar.
> 2) If -file option is used for .class or .jar files, they are unjarred on 
> tasktracker and placed in 
> ${mapred.local.dir}/taskTracker/jobcache/job_ID/jars/classes or /lib, 
> respectively. Symlinks to the directories classes and lib are created from 
> the cwd of the task, . The names of symlinks are "classes", "lib". So file 
> names of .class or .jar files do not appear in cwd of the task. 
> Paths to these files are automatically added to classpath. The tricky part is 
> that hadoop framework can pick .class or .jar using classpath, but actual 
> mapper script cannot. If you'd like to access these .class or .jar inside 
> script, please do something like "java -cp lib/*;classes/* <ClassName>". 
> 3) If -file option is used for files other than .class or .jar (e.g, .txt or 
> .pl), these files are unjarred into 
> ${mapred.local.dir}/taskTracker/jobcache/job_ID/jars/. Symlinks to these 
> files are created from the cwd of the task. Names of these symlinks are 
> actually file names. 

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