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https://issues.apache.org/jira/browse/HADOOP-15300?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-15300.
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Resolution: Duplicate
> distcp -update to WASB and ADL copies up all the files, always
> --------------------------------------------------------------
>
> Key: HADOOP-15300
> URL: https://issues.apache.org/jira/browse/HADOOP-15300
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/adl, fs/azure
> Affects Versions: 3.1.0
> Reporter: Steve Loughran
> Priority: Major
>
> If you use {{distcp -update}} to an adl or wasb store, repeatedly, all the
> source files are copied up every time. In contrast, if you use hdfs:// or
> s3a:// as a destination, only the new ones are uploaded. hdfs uses checksums
> for a diff, but s3a is just returning file length and relying on distcp logic
> being "if either src or dest doesn't do checksums, only compare file len"
> somehow that's not kicking in. Tested for file: and hdfs sources, wasb and
> adl dests
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