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https://issues.apache.org/jira/browse/HADOOP-8056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13205564#comment-13205564
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Harsh J commented on HADOOP-8056:
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Luca,
Could you also tell us if this is a regression, or a bug report as you feel the
behavior should be different?
> 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: 0.20.2, 1.0.0
> 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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