[HADOOP-13776] remove redundant classpath entries in RunJar - ASF JIRA

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Details

Type: Bug
Status: Patch Available
Priority: Major
Resolution: Unresolved
Affects Version/s: None
Fix Version/s: None
Component/s: util
Labels:
None

Description

Today when you run a "hadoop jar" command, the content of the jar gets added to the classpath twice, once in the jar form, and again in an unpacked form.

We should include the content of the jar to the classpath only once. We should keep the jar in the classpath (to support setJarByClass and other useful use cases) but remove the root of the unpacked directory.