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Posted to mapreduce-issues@hadoop.apache.org by "Dieter Plaetinck (Created) (JIRA)" <ji...@apache.org> on 2011/12/20 18:34:30 UTC

[jira] [Created] (MAPREDUCE-3584) streaming.jar -file packaging forgets timestamps

streaming.jar -file packaging forgets timestamps
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                 Key: MAPREDUCE-3584
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3584
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 0.20.2
            Reporter: Dieter Plaetinck


When invoking "hadoop jar /usr/local/hadoop/contrib/streaming/hadoop-0.20.2-streaming.jar -file <files>",
hadoop will package the files <files>, but it will forget about their timestamps.
After the files are unpacked in <tmp_dir>/mapred/local/taskTracker/jobcache/job_$job/jars, all files will have the timestamps of when the files were unpacked.
The problem is that this way meaningful information is lost.
For example in my case i ship some files along with my job, and I need to compare the age (mtime) of 2 files and rebuild one of them if it's too old,
but because of this hadoop behavior, my logic breaks.


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