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https://issues.apache.org/jira/browse/HADOOP-16158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16910141#comment-16910141
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Kai Xie commented on HADOOP-16158:
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Thanks [~jojochuang] for reviewing the patch and merging it!
I'll try to backport this patch in another Jira ticket.
> DistCp to support checksum validation when copy blocks in parallel
> ------------------------------------------------------------------
>
> Key: HADOOP-16158
> URL: https://issues.apache.org/jira/browse/HADOOP-16158
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
> Affects Versions: 3.2.0, 2.9.2, 3.0.3, 3.1.2
> Reporter: Kai Xie
> Assignee: Kai Xie
> Priority: Major
> Fix For: 3.3.0, 3.2.1, 3.1.3
>
> Attachments: HADOOP-16158.branch-3.1.patch
>
>
> Copying blocks in parallel (enabled when blocks per chunk > 0) is a great
> DistCp improvement that can hugely speed up copying big files.
> But its checksum validation is skipped, e.g. in
> `RetriableFileCopyCommand.java`
>
> {code:java}
> if (!source.isSplit()) {
> compareCheckSums(sourceFS, source.getPath(), sourceChecksum,
> targetFS, targetPath);
> }
> {code}
> and this could result in checksum/data mismatch without notifying
> developers/users (e.g. HADOOP-16049).
> I'd like to provide a patch to add the checksum validation.
>
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