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https://issues.apache.org/jira/browse/HADOOP-17611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17318848#comment-17318848
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Viraj Jasani edited comment on HADOOP-17611 at 4/11/21, 4:00 PM:
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Ah, my bad. Thanks, it updates both access time and modification time. I was
searching for direct usages of INode#setModificationTime(long
modificationTime) but missed all usages in FSDirAttrOp, it is updating all
sorts of attributes.
Thanks [~amaroti]
was (Author: vjasani):
Ah, my bad. Thanks, it updates both access time and modification time.
> Distcp parallel file copy breaks the modification time
> ------------------------------------------------------
>
> Key: HADOOP-17611
> URL: https://issues.apache.org/jira/browse/HADOOP-17611
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Adam Maroti
> Priority: Major
>
> The commit HADOOP-11794. Enable distcp to copy blocks in parallel.
> (bf3fb585aaf2b179836e139c041fc87920a3c886) broke the modification time of
> large files.
>
> In CopyCommitter.java inside concatFileChunks Filesystem.concat is called
> which changes the modification time therefore the modification times of files
> copeid by distcp will not match the source files. However this only occurs
> for large enough files, which are copied by splitting them up by distcp.
> In concatFileChunks before calling concat extract the modification time and
> apply that to the concatenated result-file after the concat. (probably best
> -after- before the rename()).
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