[ 
https://issues.apache.org/jira/browse/HADOOP-17531?focusedWorklogId=570870&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-570870
 ]

ASF GitHub Bot logged work on HADOOP-17531:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 24/Mar/21 00:42
            Start Date: 24/Mar/21 00:42
    Worklog Time Spent: 10m 
      Work Description: hadoop-yetus commented on pull request #2808:
URL: https://github.com/apache/hadoop/pull/2808#issuecomment-805383059


   :confetti_ball: **+1 overall**
   
   
   
   
   
   
   | Vote | Subsystem | Runtime |  Logfile | Comment |
   |:----:|----------:|--------:|:--------:|:-------:|
   | +0 :ok: |  reexec  |  27m  1s |  |  Docker mode activated.  |
   |||| _ Prechecks _ |
   | +1 :green_heart: |  dupname  |   0m  1s |  |  No case conflicting files 
found.  |
   | +0 :ok: |  codespell  |   0m  0s |  |  codespell was not available.  |
   | +1 :green_heart: |  @author  |   0m  0s |  |  The patch does not contain 
any @author tags.  |
   | +1 :green_heart: |  test4tests  |   0m  0s |  |  The patch appears to 
include 9 new or modified test files.  |
   |||| _ branch-3.3 Compile Tests _ |
   | +0 :ok: |  mvndep  |  13m 31s |  |  Maven dependency ordering for branch  |
   | +1 :green_heart: |  mvninstall  |  23m 24s |  |  branch-3.3 passed  |
   | +1 :green_heart: |  compile  |  18m 23s |  |  branch-3.3 passed  |
   | +1 :green_heart: |  checkstyle  |   2m 47s |  |  branch-3.3 passed  |
   | +1 :green_heart: |  mvnsite  |   2m 49s |  |  branch-3.3 passed  |
   | +1 :green_heart: |  javadoc  |   2m 38s |  |  branch-3.3 passed  |
   | +1 :green_heart: |  spotbugs  |   4m 21s |  |  branch-3.3 passed  |
   | +1 :green_heart: |  shadedclient  |  18m 13s |  |  branch has no errors 
when building and testing our client artifacts.  |
   |||| _ Patch Compile Tests _ |
   | +0 :ok: |  mvndep  |   0m 24s |  |  Maven dependency ordering for patch  |
   | +1 :green_heart: |  mvninstall  |   1m 52s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |  17m 36s |  |  the patch passed  |
   | +1 :green_heart: |  javac  |  17m 36s |  |  root generated 0 new + 1871 
unchanged - 1 fixed = 1871 total (was 1872)  |
   | +1 :green_heart: |  blanks  |   0m  0s |  |  The patch has no blanks 
issues.  |
   | +1 :green_heart: |  checkstyle  |   2m 45s |  |  root: The patch generated 
0 new + 93 unchanged - 5 fixed = 93 total (was 98)  |
   | +1 :green_heart: |  mvnsite  |   2m 51s |  |  the patch passed  |
   | +1 :green_heart: |  xml  |   0m  1s |  |  The patch has no ill-formed XML 
file.  |
   | +1 :green_heart: |  javadoc  |   2m 40s |  |  the patch passed  |
   | +1 :green_heart: |  spotbugs  |   4m 55s |  |  the patch passed  |
   | +1 :green_heart: |  shadedclient  |  18m 22s |  |  patch has no errors 
when building and testing our client artifacts.  |
   |||| _ Other Tests _ |
   | +1 :green_heart: |  unit  |  16m 53s |  |  hadoop-common in the patch 
passed.  |
   | +1 :green_heart: |  unit  |  14m 53s |  |  hadoop-distcp in the patch 
passed.  |
   | +1 :green_heart: |  unit  |   1m 59s |  |  hadoop-aws in the patch passed. 
 |
   | +1 :green_heart: |  asflicense  |   0m 50s |  |  The patch does not 
generate ASF License warnings.  |
   |  |   | 201m 15s |  |  |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2808/1/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/2808 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall 
mvnsite unit shadedclient spotbugs checkstyle codespell xml |
   | uname | Linux adbcf2c417ee 4.15.0-101-generic #102-Ubuntu SMP Mon May 11 
10:07:26 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux |
   | Build tool | maven |
   | Personality | dev-support/bin/hadoop.sh |
   | git revision | branch-3.3 / c4a28680aa75129a67c281e77fbd199dc55a6701 |
   | Default Java | Private Build-1.8.0_282-8u282-b08-0ubuntu1~18.04-b08 |
   |  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2808/1/testReport/ |
   | Max. process+thread count | 3143 (vs. ulimit of 5500) |
   | modules | C: hadoop-common-project/hadoop-common 
hadoop-tools/hadoop-distcp hadoop-tools/hadoop-aws U: . |
   | Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2808/1/console |
   | versions | git=2.17.1 maven=3.6.0 spotbugs=4.2.2 |
   | Powered by | Apache Yetus 0.14.0-SNAPSHOT https://yetus.apache.org |
   
   
   This message was automatically generated.
   
   


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 570870)
    Time Spent: 7h 50m  (was: 7h 40m)

> DistCp: Reduce memory usage on copying huge directories
> -------------------------------------------------------
>
>                 Key: HADOOP-17531
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17531
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Ayush Saxena
>            Assignee: Ayush Saxena
>            Priority: Critical
>              Labels: pull-request-available
>         Attachments: MoveToStackIterator.patch, gc-NewD-512M-3.8ML.log
>
>          Time Spent: 7h 50m
>  Remaining Estimate: 0h
>
> Presently distCp, uses the producer-consumer kind of setup while building the 
> listing, the input queue and output queue are both unbounded, thus the 
> listStatus grows quite huge.
> Rel Code Part :
> https://github.com/apache/hadoop/blob/trunk/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/SimpleCopyListing.java#L635
> This goes on bredth-first traversal kind of stuff(uses queue instead of 
> earlier stack), so if you have files at lower depth, it will like open up the 
> entire tree and the start processing....



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