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https://issues.apache.org/jira/browse/HADOOP-11211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14201046#comment-14201046
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Yitong Zhou commented on HADOOP-11211:
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[~jira.shegalov]: good suggestion! I'll update the javadoc for
{code}ApplicationClassLoader#isSystemClass{code}. And also I found
mapred-default.xml at
{code}hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml{code}.
Is this {code}mapred-default.xml{code} you are referring to? Is there any
other places I might need to consider?
> mapreduce.job.classloader.system.classes property behaves differently when
> the exclusion and inclusion order is different
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-11211
> URL: https://issues.apache.org/jira/browse/HADOOP-11211
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: hudson
> Reporter: Yitong Zhou
> Assignee: Yitong Zhou
> Attachments: HADOOP-11211.patch
>
>
> If we want to include package foo.bar.* but exclude all sub packages named
> foo.bar.tar.* in system classes, configuring
> "mapreduce.job.classloader.system.classes=foo.bar.,-foo.bar.tar." won't work.
> foo.bar.tar will still be pulled in. But if we change the order:
> "mapreduce.job.classloader.system.classes=-foo.bar.tar.,foo.bar.", then it
> will work.
> This bug is due to the implementation of ApplicationClassLoaser#isSystemClass
> in hadoop-common, where we simply return the matching result immediately when
> the class name hits the first match (either positive or negative).
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