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https://issues.apache.org/jira/browse/HADOOP-15245?focusedWorklogId=717914&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-717914
 ]

ASF GitHub Bot logged work on HADOOP-15245:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 31/Jan/22 13:52
            Start Date: 31/Jan/22 13:52
    Worklog Time Spent: 10m 
      Work Description: hadoop-yetus commented on pull request #3927:
URL: https://github.com/apache/hadoop/pull/3927#issuecomment-1025760440


   :broken_heart: **-1 overall**
   
   
   
   
   
   
   | Vote | Subsystem | Runtime |  Logfile | Comment |
   |:----:|----------:|--------:|:--------:|:-------:|
   | +0 :ok: |  reexec  |   0m 47s |  |  Docker mode activated.  |
   |||| _ Prechecks _ |
   | +1 :green_heart: |  dupname  |   0m  0s |  |  No case conflicting files 
found.  |
   | +0 :ok: |  codespell  |   0m  1s |  |  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 1 new or modified test files.  |
   |||| _ trunk Compile Tests _ |
   | +0 :ok: |  mvndep  |  11m 39s |  |  Maven dependency ordering for branch  |
   | +1 :green_heart: |  mvninstall  |  23m 44s |  |  trunk passed  |
   | +1 :green_heart: |  compile  |  29m 41s |  |  trunk passed with JDK 
Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04  |
   | -1 :x: |  compile  |  22m 49s | 
[/branch-compile-root-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/branch-compile-root-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt)
 |  root in trunk failed with JDK Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.  |
   | +1 :green_heart: |  checkstyle  |   4m 54s |  |  trunk passed  |
   | +1 :green_heart: |  mvnsite  |   2m 40s |  |  trunk passed  |
   | +1 :green_heart: |  javadoc  |   2m 17s |  |  trunk passed with JDK 
Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04  |
   | +1 :green_heart: |  javadoc  |   3m  3s |  |  trunk passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07  |
   | +1 :green_heart: |  spotbugs  |   5m  2s |  |  trunk passed  |
   | -1 :x: |  shadedclient  |  21m 11s |  |  branch has errors when building 
and testing our client artifacts.  |
   |||| _ Patch Compile Tests _ |
   | +0 :ok: |  mvndep  |   0m 23s |  |  Maven dependency ordering for patch  |
   | -1 :x: |  mvninstall  |   0m 24s | 
[/patch-mvninstall-hadoop-common-project_hadoop-common.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-mvninstall-hadoop-common-project_hadoop-common.txt)
 |  hadoop-common in the patch failed.  |
   | -1 :x: |  mvninstall  |   0m 24s | 
[/patch-mvninstall-hadoop-tools_hadoop-aws.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-mvninstall-hadoop-tools_hadoop-aws.txt)
 |  hadoop-aws in the patch failed.  |
   | -1 :x: |  compile  |   0m 26s | 
[/patch-compile-root-jdkUbuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-compile-root-jdkUbuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.txt)
 |  root in the patch failed with JDK Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.  |
   | -1 :x: |  javac  |   0m 26s | 
[/patch-compile-root-jdkUbuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-compile-root-jdkUbuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.txt)
 |  root in the patch failed with JDK Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.  |
   | -1 :x: |  compile  |   0m 25s | 
[/patch-compile-root-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-compile-root-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt)
 |  root in the patch failed with JDK Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.  |
   | -1 :x: |  javac  |   0m 25s | 
[/patch-compile-root-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-compile-root-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt)
 |  root in the patch failed with JDK Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.  |
   | +1 :green_heart: |  blanks  |   0m  0s |  |  The patch has no blanks 
issues.  |
   | -0 :warning: |  checkstyle  |   0m 22s | 
[/buildtool-patch-checkstyle-root.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/buildtool-patch-checkstyle-root.txt)
 |  The patch fails to run checkstyle in root  |
   | -1 :x: |  mvnsite  |   0m 24s | 
[/patch-mvnsite-hadoop-common-project_hadoop-common.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-mvnsite-hadoop-common-project_hadoop-common.txt)
 |  hadoop-common in the patch failed.  |
   | -1 :x: |  mvnsite  |   0m 24s | 
[/patch-mvnsite-hadoop-tools_hadoop-aws.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-mvnsite-hadoop-tools_hadoop-aws.txt)
 |  hadoop-aws in the patch failed.  |
   | -1 :x: |  javadoc  |   0m 24s | 
[/patch-javadoc-hadoop-common-project_hadoop-common-jdkUbuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-javadoc-hadoop-common-project_hadoop-common-jdkUbuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.txt)
 |  hadoop-common in the patch failed with JDK 
Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.  |
   | -1 :x: |  javadoc  |   0m 25s | 
[/patch-javadoc-hadoop-tools_hadoop-aws-jdkUbuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-javadoc-hadoop-tools_hadoop-aws-jdkUbuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.txt)
 |  hadoop-aws in the patch failed with JDK 
Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04.  |
   | -1 :x: |  javadoc  |   0m 25s | 
[/patch-javadoc-hadoop-common-project_hadoop-common-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-javadoc-hadoop-common-project_hadoop-common-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt)
 |  hadoop-common in the patch failed with JDK Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.  |
   | -1 :x: |  javadoc  |   0m 24s | 
[/patch-javadoc-hadoop-tools_hadoop-aws-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-javadoc-hadoop-tools_hadoop-aws-jdkPrivateBuild-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.txt)
 |  hadoop-aws in the patch failed with JDK Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07.  |
   | -1 :x: |  spotbugs  |   0m 24s | 
[/patch-spotbugs-hadoop-common-project_hadoop-common.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-spotbugs-hadoop-common-project_hadoop-common.txt)
 |  hadoop-common in the patch failed.  |
   | -1 :x: |  spotbugs  |   0m 24s | 
[/patch-spotbugs-hadoop-tools_hadoop-aws.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-spotbugs-hadoop-tools_hadoop-aws.txt)
 |  hadoop-aws in the patch failed.  |
   | +1 :green_heart: |  shadedclient  |  10m 47s |  |  patch has no errors 
when building and testing our client artifacts.  |
   |||| _ Other Tests _ |
   | -1 :x: |  unit  |   0m 23s | 
[/patch-unit-hadoop-common-project_hadoop-common.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-unit-hadoop-common-project_hadoop-common.txt)
 |  hadoop-common in the patch failed.  |
   | -1 :x: |  unit  |   0m 24s | 
[/patch-unit-hadoop-tools_hadoop-aws.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/patch-unit-hadoop-tools_hadoop-aws.txt)
 |  hadoop-aws in the patch failed.  |
   | +0 :ok: |  asflicense  |   0m 24s |  |  ASF License check generated no 
output?  |
   |  |   | 138m 19s |  |  |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/3927 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall 
mvnsite unit shadedclient spotbugs checkstyle codespell |
   | uname | Linux c7445df1c60a 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 
23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux |
   | Build tool | maven |
   | Personality | dev-support/bin/hadoop.sh |
   | git revision | trunk / ae4e48c51bb0b4d3ec12c6b2e06d6b9a34c19cd4 |
   | Default Java | Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
   | Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.13+8-Ubuntu-0ubuntu1.20.04 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
   |  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/testReport/ |
   | Max. process+thread count | 250 (vs. ulimit of 5500) |
   | modules | C: hadoop-common-project/hadoop-common hadoop-tools/hadoop-aws 
U: . |
   | Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3927/2/console |
   | versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
   | Powered by | Apache Yetus 0.14.0-SNAPSHOT https://yetus.apache.org |
   
   
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 717914)
    Time Spent: 40m  (was: 0.5h)

> S3AInputStream.skip() to use lazy seek
> --------------------------------------
>
>                 Key: HADOOP-15245
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15245
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.1.0
>            Reporter: Steve Loughran
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> the default skip() does a read and discard of all bytes, no matter how far 
> ahead the skip is. This is very inefficient if the skip() is being done on 
> S3A random IO, though exactly what to do when in sequential mode.
> Proposed: 
> * add an optimized version of S3AInputStream.skip() which does a lazy seek, 
> which itself will decided when to skip() vs issue a new GET.
> * add some more instrumentation to measure how often this gets used



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