I'm not sure why the Jenkins Findbugs report is empty, but I ran Findbugs locally and confirmed that there is in fact a warning. After applying the patch, there is a dead store to parentKey on line 1564 of NativeAzureFileSystem. We never read from parentKey again, so this is a legitimate dead store warning.
Duo, would you please provide another revision of the patch that removes line 1564? I'll be +1 after that. Thanks!