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https://issues.apache.org/jira/browse/HADOOP-15273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16390143#comment-16390143
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Steve Loughran commented on HADOOP-15273:
-----------------------------------------

copymapper contains test to look for string of (incorrect) -skipCrc message. So 
not just wrong, tests to make sure it stays wrong :)

> distcp can't handle remote stores with different checksum algorithms
> --------------------------------------------------------------------
>
>                 Key: HADOOP-15273
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15273
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: tools/distcp
>    Affects Versions: 3.1.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Critical
>         Attachments: HADOOP-15273-001.patch
>
>
> When using distcp without {{-skipcrcchecks}} . If there's a checksum mismatch 
> between src and dest store types (e.g hdfs to s3), then the error message 
> will talk about blocksize, even when its the underlying checksum protocol 
> itself which is the cause for failure
> bq. Source and target differ in block-size. Use -pb to preserve block-sizes 
> during copy. Alternatively, skip checksum-checks altogether, using -skipCrc. 
> (NOTE: By skipping checksums, one runs the risk of masking data-corruption 
> during file-transfer.)
> update:  the CRC check takes always place on a distcp upload before the file 
> is renamed into place. *and you can't disable it then*



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