[jira] [Created] (YARN-5730) Improve setting of environment variable HOME in containers

["Markus Döring (JIRA)" <ji...@apache.org>]

Markus Döring created YARN-5730:
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             Summary: Improve setting of environment variable HOME in containers
                 Key: YARN-5730
                 URL: https://issues.apache.org/jira/browse/YARN-5730
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: nodemanager
         Environment: ContainerLaunch.java
            Reporter: Markus Döring
            Priority: Minor


Currently, the HOME environment variable for a YARN container is determined as follows[1]:

# if the (undocumented) configuration {{yarn.nodemanager.user-home-dir}} is set, HOME is set to its value
# otherwise, HOME is set to {{"/home/"}}

Option 1 is suboptimal in a multi-user environment, while the default does not help at all.

It would be nice if we could  do one of the following:

# default to HOME unset
# default to {{"/home/" + container.getUser()}}
# get HOME from container

Option 1 would at least inform the process about the problem, but would obviously cause some problems in programs that assume HOME to be set. Option 2 might point to the correct home, at least it's not more  incorrect than {{"/home/"}}. Option 3 might be the best choice, but it also requires API changes.



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