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https://issues.apache.org/jira/browse/MAPREDUCE-1672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12883711#action_12883711
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Konstantin Boudnik commented on MAPREDUCE-1672:
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Is there really no such thing as creating a DFS file yet?
Also, your latest patch for y20 security seems to be too short.
> 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:
> TEST-org.apache.hadoop.mapred.TestDistributedCacheUnModifiedFile.txt,
> TEST-org.apache.hadoop.mapred.TestDistributedCacheUnModifiedFile.txt,
> TestDistributedCacheUnModifiedFile-ydist-security-patch.txt,
> TestDistributedCacheUnModifiedFile.patch,
> TestDistributedCacheUnModifiedFile.patch,
> TestDistributedCacheUnModifiedFile.patch,
> TestDistributedCacheUnModifiedFile.patch,
> TestDistributedCacheUnModifiedFile.patch,
> 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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