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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-16158) DistCp to support checksum validation when copy blocks in parallel
Date Mon, 19 Aug 2019 01:58:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-16158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wei-Chiu Chuang updated HADOOP-16158:
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 3.1.3
                   3.2.1
                   3.3.0
           Status: Resolved  (was: Patch Available)

Pushed to trunk branch-3.2 without conflcits. There is a trivial import conflict in branch-3.1.
I resolved it and pushed the commit to branch-3.1.  [^HADOOP-16158.branch-3.1.patch]  for
reference.

> 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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