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https://issues.apache.org/jira/browse/HADOOP-5981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12717225#action_12717225
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Hemanth Yamijala commented on HADOOP-5981:
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Hmm. I don't fully understand this patch.
So, what is the requirement with respect to variable substitution in
mapred.child.env ? Currently, it looks like unless the key has LD_LIBRARY_PATH,
it is not going to do anything useful.
For e.g. if I have mapred.child.env with the value as "key=$value", where
'value' is in the environment of the Tasktracker, since 'key' is not added to
the 'env' variable in the taskrunner method, it will not work, right ? I
thought the use case would be that if any thing in the value should be picked
from the tasktracker's environment, it should be replaced. Isn't this the use
case ?
> HADOOP-2838 doesnt work as expected
> -----------------------------------
>
> Key: HADOOP-5981
> URL: https://issues.apache.org/jira/browse/HADOOP-5981
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Amar Kamat
> Assignee: Amar Kamat
> Fix For: 0.21.0
>
> Attachments: HADOOP-5981-v1.1-branch-20.patch, HADOOP-5981-v1.1.patch
>
>
> The substitution feature i.e X=$X:/tmp doesnt work as expected.
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