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Posted to common-issues@hadoop.apache.org by "Kai Xie (Jira)" <ji...@apache.org> on 2019/08/28 14:27:00 UTC

[jira] [Created] (HADOOP-16536) Backport HADOOP-16158 to branch-2

Kai Xie created HADOOP-16536:
--------------------------------

             Summary: Backport HADOOP-16158 to branch-2
                 Key: HADOOP-16536
                 URL: https://issues.apache.org/jira/browse/HADOOP-16536
             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
             Fix For: 3.3.0, 3.2.1, 3.1.3


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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