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https://issues.apache.org/jira/browse/HADOOP-8143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14190191#comment-14190191
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Allen Wittenauer commented on HADOOP-8143:
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bq. If such files were to be copied between clusters without preserving
block-sizes, there would ensue performance-fails (at best) or data-corruptions
(at worst).
Wow, such fragility. If data-corruption happens because the block size is
changing, that sounds like a great reason not to use ORC.
> Change distcp to have -pb on by default
> ---------------------------------------
>
> Key: HADOOP-8143
> URL: https://issues.apache.org/jira/browse/HADOOP-8143
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Dave Thompson
> Assignee: Mithun Radhakrishnan
> Priority: Minor
> Attachments: HADOOP-8143.1.patch
>
>
> We should have the preserve blocksize (-pb) on in distcp by default.
> checksum which is on by default will always fail if blocksize is not the same.
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