Create test scenario for "distributed cache file behaviour, when dfs file is
modified"
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Key: MAPREDUCE-1676
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1676
Project: Hadoop Map/Reduce
Issue Type: Test
Affects Versions: 0.22.0
Reporter: Iyappan Srinivasan
Verify the Distributed Cache functionality. This test scenario is for a
distributed cache file behaviour when it is 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, but with differnt timestamp, then that file is stored
again. So, if two jobs choose the same tasktracker for their job execution
then, the distributed cache file should be found twice.
This testcase runs 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 be uploaded again and task should not use the old file.
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