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From "Luca Pireddu (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8056) Configuration doesn't pass empty string values to tasks
Date Fri, 10 Feb 2012 17:27:00 GMT
Configuration doesn't pass empty string values to tasks
-------------------------------------------------------

                 Key: HADOOP-8056
                 URL: https://issues.apache.org/jira/browse/HADOOP-8056
             Project: Hadoop Common
          Issue Type: Bug
          Components: conf
    Affects Versions: 1.0.0, 0.20.2
            Reporter: Luca Pireddu


If I assign an *empty string* as a value to a property in a JobConf 'job' while I'm preparing
it to run, the Configuration does store that value.  I can retrieve it later while in the
same process and the value is maintained.

However, if then call JobClient.runJob(job), the Configuration that is received by the Map
and Reduce tasks doesn't contain the property, and calling JobConf.get with that property
name returns null (instead of an empty string).  Futher, if I inspect the job's configuration
via Hadoop's web interface, the property isn't present.

It seems as if whatever serialization mechanism that is used to transmit the Configuration
from the job client to the tasks discards properties with "" value.


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