[GitHub] [incubator-gobblin] amarnathkarthik opened a new pull request #2623: [GOBBLIN-759] Added feature to support DistCP to copy files modified in last n days

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amarnathkarthik opened a new pull request #2623: [GOBBLIN-759] Added feature to support DistCP to copy files modified in last n days
URL: https://github.com/apache/incubator-gobblin/pull/2623
 
 
   Dear Gobblin maintainers,
   
   Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!
   
   
   ### JIRA
   - [x] My PR addresses the following [Gobblin JIRA](https://issues.apache.org/jira/browse/GOBBLIN/) issues and references them in the PR title. For example, "[GOBBLIN-759] My Added feature to support DistCP to copy files modified in last n days"
       - https://issues.apache.org/jira/browse/GOBBLIN-759
   
   
   ### Description
   - [x] Here are some details about my PR, including screenshots (if applicable):
   1. Added feature to DistCP the files which were modified in last n days within the lookback period.
   2. This feature allows to copy only the modified files even when non modified files not at the destination.
   3. Leverage existing TimestampBasedCopyableDataset to find the dataset and uses SelectBtwModDataTimeBasedCopyableFileFilter CopyableFilter implementation to filter the files that were modified in last n days.
   
   ### Tests
   - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   1. Added TimestampBasedCopyableDatasetTest.testCopyWithFilter test case to test 1 modified and 1 non-modified scenario.
   
   
   ### Commits
   - [ ] My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
       1. Subject is separated from body by a blank line
       2. Subject is limited to 50 characters
       3. Subject does not end with a period
       4. Subject uses the imperative mood ("add", not "adding")
       5. Body wraps at 72 characters
       6. Body explains "what" and "why", not "how"
   
   

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