[jira] Created: (HADOOP-7056) NN unintentionally reads mapred-site.xml

["Aaron T. Myers (JIRA)" <ji...@apache.org>]

NN unintentionally reads mapred-site.xml
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                 Key: HADOOP-7056
                 URL: https://issues.apache.org/jira/browse/HADOOP-7056
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 0.22.0
            Reporter: Aaron T. Myers


It seems that {{mapred-site.xml}} is now unintentionally being read by the NN, and probably all the daemons.

This is because the {{Groups}} constructor calls {{ReflectionUtils.newInstance(...)}}, which in turn calls {{ReflectionUtils.setConf(...)}}, which calls {{ReflectionUtils.setJobConf(...)}}, which creates an instance of {{o.a.h.mapred.JobConf}}, which calls {{o.a.h.mapreduce.util.ConfigUtil.loadResources(...)}}, which reads in {{mapred-site.xml}} and {{mapred-default.xml}}. Phew!

I suspect the appropriate solution is for {{ReflectionUtils.setConf(...)}} to be changed to not call (the mapred-specific) {{ReflectionUtils.setJobConf(...)}}, but there's a comment in there which says it's being left in place for backward compatibility. Can somebody with more knowledge of that situation please comment?

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