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https://issues.apache.org/jira/browse/MAPREDUCE-1672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854222#action_12854222
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Konstantin Boudnik commented on MAPREDUCE-1672:
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Looks good to me except that there's already a file
{{src/test/org/apache/hadoop/mapred/UtilsForTests.java}} so please consider
adding your utils there rather than creating a brand new one.
Also, please ask some MR expert to look at it from MR standpoint - I'm don't
have enough knowledge in the field. It also will help if you can run the test
and port the results to the JIRA.
> Create test scenario for "distributed cache file behaviour, when dfs file is
> not modified"
> ------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1672
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1672
> Project: Hadoop Map/Reduce
> Issue Type: Test
> Components: test
> Reporter: Iyappan Srinivasan
> Assignee: Iyappan Srinivasan
> Attachments: TestDistributedCacheUnModifiedFile.patch,
> TestDistributedCacheUnModifiedFile.patch
>
>
> This test scenario is for a distributed cache file behaviour
> when it is not modified before and after being
> accessed by maximum two jobs. Once a job uses a distributed cache file
> that file is stored in the mapred.local.dir. If the next job
> uses the same file, then that is not stored again.
> So, if two jobs choose the same tasktracker for their job execution
> then, the distributed cache file should not be found twice.
> This testcase should run a job with a distributed cache file. All the
> tasks' corresponding tasktracker's handle is got and checked for
> the presence of distributed cache with proper permissions in the
> proper directory. Next when job
> runs again and if any of its tasks hits the same tasktracker, which
> ran one of the task of the previous job, then that
> file should not be uploaded again and task use the old file.
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