[MAPREDUCE-5490] MapReduce doesn't set the environment variable for children processes

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 1.2.1
• Labels: BB2015-05-TBR
• Assignee: Owen O'Malley
• Reporter: Owen O'Malley
• Created: 30/Aug/13 23:13
• Updated: 04/Mar/18 18:12
• Resolved: 04/Mar/18 18:12

Description

Currently, MapReduce uses the command line argument to pass the classpath to the child. This breaks if the process forks a child that needs the same classpath. Such a case happens in Hive when it uses map-side joins. I propose that we make MapReduce in branch-1 use the CLASSPATH environment variable like YARN does.

Issue Links

• is related to: MAPREDUCE-6454 MapReduce doesn't set the HADOOP_CLASSPATH for jar lib in distributed cache.