adoroszlai commented on pull request #1062:
URL: https://github.com/apache/hadoop-ozone/pull/1062#issuecomment-643626366


   Codecov seems to agree with you. ;)  It will not compare against commits 
with failed CI (if it know that CI passed or failed).  From the 
[doc](https://docs.codecov.io/docs/comparing-commits#commits-with-failed-ci):
   
   > If CI fails, one or more of the following assumptions can be made:
   > 1. Not all tests were executed; therefore coverage is incomplete.
   > 2. Exceptions may call new execution paths, resulting in different 
coverage metrics.
   > 3. A failed test could produce different coverage than the same test ran 
successfully.
   
   I think for Ozone:
   
   1. is the worst problem, can happen if dependent modules are skipped by 
Maven due to earlier failure (eg. in `common`).
   2. is true even for successful CI 
([example](https://codecov.io/gh/apache/hadoop-ozone/compare/bd88eec9fec06a8f8adcbe4d257c5ccaca144f4c...96f07d5c27ba8f2ab9d77df25e10d4cb94489e5f/changes),
 where [only javadoc was 
updated](https://github.com/apache/hadoop-ozone/commit/96f07d5c27ba8f2ab9d77df25e10d4cb94489e5f)).
   3. is something we should try to fix (eg. split test cases that perform a 
long series of steps, making assertions all the way).


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