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From "Kai Xie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-16158) DistCp to support checksum validation when copy blocks in parallel
Date Mon, 19 Aug 2019 02:40:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-16158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16910141#comment-16910141
] 

Kai Xie commented on HADOOP-16158:
----------------------------------

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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