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Posted to common-issues@hadoop.apache.org by "Wei-Chiu Chuang (Jira)" <ji...@apache.org> on 2023/06/17 19:54:00 UTC
[jira] [Commented] (HADOOP-18596) Distcp -update between different cloud stores to use modification time while checking for file skip.
[ https://issues.apache.org/jira/browse/HADOOP-18596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17733813#comment-17733813 ]
Wei-Chiu Chuang commented on HADOOP-18596:
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This change and HADOOP-18633 failed a hbase-filesystem test. Should this behavior be turned on by default or should we fix the test in hbase-filesystem?
> Distcp -update between different cloud stores to use modification time while checking for file skip.
> ----------------------------------------------------------------------------------------------------
>
> Key: HADOOP-18596
> URL: https://issues.apache.org/jira/browse/HADOOP-18596
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
> Reporter: Mehakmeet Singh
> Assignee: Mehakmeet Singh
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.3.6
>
>
> Distcp -update currently relies on File size, block size, and Checksum comparisons to figure out which files should be skipped or copied.
> Since different cloud stores have different checksum algorithms we should check for modification time as well to the checks.
> This would ensure that while performing -update if the files are perceived to be out of sync we should copy them. The machines between which the file transfers occur should be in time sync to avoid any extra copies.
> Improving testing and documentation for modification time checks between different object stores to ensure no incorrect skipping of files.
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