Bing Jiang created MAPREDUCE-6015:
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Summary: Make MR ApplicationMaster disable loading user's jars
firstly
Key: MAPREDUCE-6015
URL: https://issues.apache.org/jira/browse/MAPREDUCE-6015
Project: Hadoop Map/Reduce
Issue Type: Improvement
Reporter: Bing Jiang
In most cases, we want to use -Dmapreduce.user.classpath.first=true to pick
user's jars ahead of hadoop system's jars, which can make tasks run based upon
the customized environment under the circumstance that hadoop system default
library contains the different version of dependent jars.
However, using -Dmapreduce.user.classpath.first=true will cause
ApplicationMaster failure to launch due to conflicting classes.
In most cases, if users do not customize the ApplicationMaster for MapReduce
framework, I believe we can treat MRAppMaster different with MapTask/ReduceTask
at the point of loading user's jar in classloader.
I believe it can provide a property of
'-Dmapreduce.am.user.classpath.first=false' to disable the feature of loading
user's jars firstly.
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