Steve Loughran commented on HADOOP-15273:

You can't do this, as the current hdfs comparison logic depends on the 
algorithm name as part of the match; ignoring it would lead to false answers

Better to say "if you don't want checksum comparison, "-skipcrccheck"

> distcp to downgrade on checksum algorithm mismatch to "files unchanged"
> -----------------------------------------------------------------------
>                 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
>            Priority: Minor
> When using distcp without {{-skipCRC}} . 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.)
> IF the checksum types are fundamentally different, the error message should 
> say so

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