Gera Shegalov created MAPREDUCE-5813:
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Summary: YarnChild does not load job.xml with
mapreduce.job.classloader=true
Key: MAPREDUCE-5813
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5813
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2, task
Affects Versions: 2.3.0
Reporter: Gera Shegalov
Priority: Blocker
{{YarnChild.main}} uses {{JobConf.addResource(String)}} to load {{job.xml}}
that relies on class loading. When {{mapreduce.job.classloader=true}} the
job-speicific part of the class path is separated from {{CLASSPATH}} into
{{APP_CLASSPATH}}. Therefore {{job.xml}} is inaccessible for the default class
loader. Later {{writeLocalJobFile}} overwrites the correct localized
{{job.xml}} on disk as well.
This problem is easily avoided by using {{JobConf.addResource(Path)}} to read
the localized {{job.xml}} without relying on class loading.
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