[jira] [Created] (HADOOP-18596) Distcp -update between different cloud stores to use modification time while checking for file skip.

["Mehakmeet Singh (Jira)" <ji...@apache.org>]

Mehakmeet Singh created HADOOP-18596:
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             Summary: Distcp -update between different cloud stores to use modification time while checking for file skip.
                 Key: HADOOP-18596
                 URL: https://issues.apache.org/jira/browse/HADOOP-18596
             Project: Hadoop Common
          Issue Type: Improvement
          Components: tools/distcp
            Reporter: Mehakmeet Singh
            Assignee: Mehakmeet Singh


Distcp -update currently relies on File size, block size, and Checksum comparisons to figure out which files should be skipped or copied. 
Since different cloud stores have different checksum algorithms we should check for modification time as well to the checks.

This would ensure that while performing -update if the files are perceived to be out of sync we should copy them. The machines between which the file transfers occur should be in time sync to avoid any extra copies.

Improving testing and documentation for modification time checks between different object stores to ensure no incorrect skipping of files.



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