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https://issues.apache.org/jira/browse/MAPREDUCE-6304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14523543#comment-14523543
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Wangda Tan commented on MAPREDUCE-6304:
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[~Naganarasimha],
Patch generally LGTM, one minor comment:
- If specify label="" in mapred-default.xml, which means the job will always
set label="" while adding resource-request, but the previously behavior is send
"null" instead of empty string. So I suggest to change the default to be "NOT
SPECIFIED" (which is not a valid label since it contains space) as default
value, and we will replace it by null. Does this make sense to you? Do you have
any other ideas on this?
And could you deploy a few nodes cluster, with 2-3 labels, and run MR job with
am.label, mapper.label, reducer.label, etc. that will be very important to make
sure everything works well.
> Specifying node labels when submitting MR jobs
> ----------------------------------------------
>
> Key: MAPREDUCE-6304
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6304
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Reporter: Jian Fang
> Assignee: Naganarasimha G R
> Fix For: 2.8.0
>
> Attachments: MAPREDUCE-6304.20150410-1.patch,
> MAPREDUCE-6304.20150411-1.patch, MAPREDUCE-6304.20150501-1.patch
>
>
> Per the discussion on YARN-796, we need a mechanism in MAPREDUCE to specify
> node labels when submitting MR jobs.
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