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https://issues.apache.org/jira/browse/MAPREDUCE-1641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12859224#action_12859224
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Arun C Murthy commented on MAPREDUCE-1641:
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Dick, some comments:
# I'd rename DistributedCache.validateCachesDontOverlap to
DistributedCache.validate to keep it simple, in future we may add more
validations there, so having one public api might prove useful and succint.
# In the same function, and elsewhere, I'd define a public static final String
for 'mapred.cache.archives' and 'mapred.cache.files' and use them instead of
the raw strings.
# Request you to add a test-case which uses the Mini* clusters to ensure the
validation works with fully-qualified hdfs uris (hdfs://nn:8000/user/blah/foo),
and absolute Paths (/user/blah/foo).
> Job submission should fail if same uri is added for mapred.cache.files and
> mapred.cache.archives
> ------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1641
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1641
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: distributed-cache
> Reporter: Amareshwari Sriramadasu
> Assignee: Dick King
> Fix For: 0.22.0
>
> Attachments: BZ-3539321--off-0-20-101--2010-04-20.patch
>
>
> The behavior of mapred.cache.files and mapred.cache.archives is different
> during localization in the following way:
> If a jar file is added to mapred.cache.files, it will be localized under
> TaskTracker under a unique path.
> If a jar file is added to mapred.cache.archives, it will be localized under a
> unique path in a directory named the jar file name, and will be unarchived
> under the same directory.
> If same jar file is passed for both the configurations, the behavior
> undefined. Thus the job submission should fail.
> Currently, since distributed cache processes files before archives, the jar
> file will be just localized and not unarchived.
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