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https://issues.apache.org/jira/browse/MAPREDUCE-3736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13195227#comment-13195227
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Ahmed Radwan commented on MAPREDUCE-3736:
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bq. why do we need to add fs.default.name back to core-default.xml
We don't need to, I just added it for backward compatibility, in case other
dependent projects are still using it. I added (in the description) that it is
deprecated, so fs.defaultFS will be used instead in the future.
bq. is the mapreduce.job.hdfs-servers change sufficient or do they also require
fs.default.name be set?
Just setting mapreduce.job.hdfs-servers to fs.defaultFS is sufficient to
address the failures described in this bug.
> Variable substitution depth too large for fs.default.name causes jobs to fail
> -----------------------------------------------------------------------------
>
> Key: MAPREDUCE-3736
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3736
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.1
> Reporter: Eli Collins
> Assignee: Ahmed Radwan
> Priority: Blocker
> Attachments: MAPREDUCE-3736.patch, MAPREDUCE-3736_rev2.patch
>
>
> I'm seeing the same failure as MAPREDUCE-3462 in downstream projects running
> against a recent build of branch-23. MR-3462 modified the tests rather than
> fixing the framework. In that jira Ravi mentioned "I'm still ignorant of the
> change which made the tests start to fail. I should probably understand
> better the reasons for that change before proposing a more generalized fix."
> Let's figure out the general fix (rather than require all projects to set
> mapreduce.job.hdfs-servers in their conf we should fix this in the
> framework). Perhaps we should not default this config to "$fs.default.name"?
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