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https://issues.apache.org/jira/browse/HADOOP-18596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17682021#comment-17682021
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ASF GitHub Bot commented on HADOOP-18596:
-----------------------------------------

hadoop-yetus commented on PR #5308:
URL: https://github.com/apache/hadoop/pull/5308#issuecomment-1408457069

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
   | Vote | Subsystem | Runtime |  Logfile | Comment |
   |:----:|----------:|--------:|:--------:|:-------:|
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   |||| _ Prechecks _ |
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|
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   | +1 :green_heart: |  test4tests  |   0m  0s |  |  The patch appears to 
include 1 new or modified test files.  |
   |||| _ trunk Compile Tests _ |
   | +1 :green_heart: |  mvninstall  |  46m 19s |  |  trunk passed  |
   | +1 :green_heart: |  compile  |   0m 31s |  |  trunk passed with JDK 
Ubuntu-11.0.17+8-post-Ubuntu-1ubuntu220.04  |
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Private Build-1.8.0_352-8u352-ga-1~20.04-b08  |
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   | +1 :green_heart: |  mvnsite  |   0m 31s |  |  trunk passed  |
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Ubuntu-11.0.17+8-post-Ubuntu-1ubuntu220.04  |
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Private Build-1.8.0_352-8u352-ga-1~20.04-b08  |
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   |||| _ Patch Compile Tests _ |
   | +1 :green_heart: |  mvninstall  |   0m 30s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |   0m 24s |  |  the patch passed with JDK 
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   | +1 :green_heart: |  javac  |   0m 24s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |   0m 21s |  |  the patch passed with JDK 
Private Build-1.8.0_352-8u352-ga-1~20.04-b08  |
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   | +1 :green_heart: |  blanks  |   0m  0s |  |  The patch has no blanks 
issues.  |
   | +1 :green_heart: |  checkstyle  |   0m 14s |  |  the patch passed  |
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   | +1 :green_heart: |  javadoc  |   0m 17s |  |  the patch passed with JDK 
Private Build-1.8.0_352-8u352-ga-1~20.04-b08  |
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   | +1 :green_heart: |  shadedclient  |  26m  4s |  |  patch has no errors 
when building and testing our client artifacts.  |
   |||| _ Other Tests _ |
   | +1 :green_heart: |  unit  |  46m  3s |  |  hadoop-distcp in the patch 
passed.  |
   | +1 :green_heart: |  asflicense  |   0m 32s |  |  The patch does not 
generate ASF License warnings.  |
   |  |   | 154m 24s |  |  |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5308/3/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/5308 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall 
mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets |
   | uname | Linux 33f023938bd4 4.15.0-200-generic #211-Ubuntu SMP Thu Nov 24 
18:16:04 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux |
   | Build tool | maven |
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   |  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5308/3/testReport/ |
   | Max. process+thread count | 540 (vs. ulimit of 5500) |
   | modules | C: hadoop-tools/hadoop-distcp U: hadoop-tools/hadoop-distcp |
   | Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5308/3/console |
   | versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
   | Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
   
   
   This message was automatically generated.
   
   




> 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
>
> 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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