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https://issues.apache.org/jira/browse/MAPREDUCE-1677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12856358#action_12856358
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Iyappan Srinivasan commented on MAPREDUCE-1677:
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1) Vector cannot be used here because the requirement is go though every
taskInfo , tasktracker, mapred.local.dir on every tasktracker, one by one.
Catpturing this info in a string array and going through them one by one, fits
nicely for array.
2) Yes, there is a command called
TaskTracker.getPrivateDistributedCacheDir(username). This will give
mapred.local.dir/taskTracker/<username>/distcache. The requirement here is ,
path is required only till mapred.local.dir/taskTracker/<username> only and not
the final distcache. So, either this full path can be got first and then take
off the last word called distcache or do it like localDir + Path.SEPARATOR +
TaskTracker.SUBDIR + Path.SEPARATOR + userName. The latter seemed better
because, this will work even if that word "dsitcache" is changed in the future.
> Test scenario for a distributed cache file behaviour when the file is private
> ------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1677
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1677
> Project: Hadoop Map/Reduce
> Issue Type: Test
> Components: test
> Affects Versions: 0.22.0
> Reporter: Iyappan Srinivasan
> Assignee: Iyappan Srinivasan
> Attachments:
> TEST-org.apache.hadoop.mapred.TestDistributedCachePrivateFile.txt,
> TestDistributedCachePrivateFile.patch, TestDistributedCachePrivateFile.patch
>
>
> Verify the Distributed Cache functionality.
> This test scenario is for a distributed cache file behaviour when the file
> is private. Once a job uses a distributed
> cache file with private permissions that file is stored in the
> mapred.local.dir, under the directory which has the same name
> as job submitter's username. The directory has 700 permission and the file
> under it, should have 777 permissions.
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