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https://issues.apache.org/jira/browse/HADOOP-18193?focusedWorklogId=769419&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-769419
 ]

ASF GitHub Bot logged work on HADOOP-18193:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 12/May/22 04:42
            Start Date: 12/May/22 04:42
    Worklog Time Spent: 10m 
      Work Description: hadoop-yetus commented on PR #4181:
URL: https://github.com/apache/hadoop/pull/4181#issuecomment-1124523817

   :broken_heart: **-1 overall**
   
   
   
   
   
   
   | Vote | Subsystem | Runtime |  Logfile | Comment |
   |:----:|----------:|--------:|:--------:|:-------:|
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   |||| _ 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 4 new or modified test files.  |
   |||| _ trunk Compile Tests _ |
   | +0 :ok: |  mvndep  |  15m 42s |  |  Maven dependency ordering for branch  |
   | +1 :green_heart: |  mvninstall  |  28m 15s |  |  trunk passed  |
   | +1 :green_heart: |  compile  |  25m  7s |  |  trunk passed with JDK 
Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1  |
   | +1 :green_heart: |  compile  |  21m 46s |  |  trunk passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07  |
   | +1 :green_heart: |  checkstyle  |   4m 33s |  |  trunk passed  |
   | +1 :green_heart: |  mvnsite  |   3m 57s |  |  trunk passed  |
   | -1 :x: |  javadoc  |   1m 36s | 
[/branch-javadoc-hadoop-common-project_hadoop-common-jdkPrivateBuild-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4181/20/artifact/out/branch-javadoc-hadoop-common-project_hadoop-common-jdkPrivateBuild-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.txt)
 |  hadoop-common in trunk failed with JDK Private 
Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.  |
   | +1 :green_heart: |  javadoc  |   4m  4s |  |  trunk passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07  |
   | +1 :green_heart: |  spotbugs  |   7m  1s |  |  trunk passed  |
   | +1 :green_heart: |  shadedclient  |  26m 50s |  |  branch has no errors 
when building and testing our client artifacts.  |
   |||| _ Patch Compile Tests _ |
   | +0 :ok: |  mvndep  |   0m 25s |  |  Maven dependency ordering for patch  |
   | +1 :green_heart: |  mvninstall  |   2m 28s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |  24m 15s |  |  the patch passed with JDK 
Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1  |
   | +1 :green_heart: |  javac  |  24m 15s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |  21m 47s |  |  the patch passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07  |
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issues.  |
   | -0 :warning: |  checkstyle  |   4m 21s | 
[/results-checkstyle-root.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4181/20/artifact/out/results-checkstyle-root.txt)
 |  root: The patch generated 66 new + 159 unchanged - 3 fixed = 225 total (was 
162)  |
   | +1 :green_heart: |  mvnsite  |   3m 57s |  |  the patch passed  |
   | -1 :x: |  javadoc  |   1m 28s | 
[/patch-javadoc-hadoop-common-project_hadoop-common-jdkPrivateBuild-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4181/20/artifact/out/patch-javadoc-hadoop-common-project_hadoop-common-jdkPrivateBuild-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.txt)
 |  hadoop-common in the patch failed with JDK Private 
Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1.  |
   | +1 :green_heart: |  javadoc  |   4m  1s |  |  the patch passed with JDK 
Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07  |
   | +1 :green_heart: |  spotbugs  |   7m  8s |  |  the patch passed  |
   | +1 :green_heart: |  shadedclient  |  27m  2s |  |  patch has no errors 
when building and testing our client artifacts.  |
   |||| _ Other Tests _ |
   | +1 :green_heart: |  unit  |  18m 20s |  |  hadoop-common in the patch 
passed.  |
   | -1 :x: |  unit  | 357m 44s | 
[/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4181/20/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt)
 |  hadoop-hdfs in the patch passed.  |
   | +1 :green_heart: |  asflicense  |   1m 33s |  |  The patch does not 
generate ASF License warnings.  |
   |  |   | 616m 58s |  |  |
   
   
   | Reason | Tests |
   |-------:|:------|
   | Failed junit tests | hadoop.hdfs.TestClientProtocolForPipelineRecovery |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4181/20/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/4181 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall 
mvnsite unit shadedclient spotbugs checkstyle codespell |
   | uname | Linux 8eabdbd2a578 4.15.0-175-generic #184-Ubuntu SMP Thu Mar 24 
17:48:36 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux |
   | Build tool | maven |
   | Personality | dev-support/bin/hadoop.sh |
   | git revision | trunk / 75ede1a7d84eff34716d4a54c028deb258226cd3 |
   | Default Java | Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
   | Multi-JDK versions | /usr/lib/jvm/java-11-openjdk-amd64:Private 
Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1 
/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-4181/20/testReport/ |
   | Max. process+thread count | 3129 (vs. ulimit of 5500) |
   | modules | C: hadoop-common-project/hadoop-common 
hadoop-hdfs-project/hadoop-hdfs U: . |
   | Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4181/20/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 |
   
   
   This message was automatically generated.
   
   




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

    Worklog Id:     (was: 769419)
    Time Spent: 7h 20m  (was: 7h 10m)

> Support nested mount points in INodeTree
> ----------------------------------------
>
>                 Key: HADOOP-18193
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18193
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: viewfs
>    Affects Versions: 2.10.0
>            Reporter: Lei Yang
>            Assignee: Lei Yang
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>         Attachments: Nested Mount Point in ViewFs.pdf
>
>          Time Spent: 7h 20m
>  Remaining Estimate: 0h
>
> Defining following client mount table config is not supported in  INodeTree 
> and will throw FileAlreadyExistsException
>  
> {code:java}
> fs.viewfs.mounttable.link./foo/bar=hdfs://nn1/foo/bar
> fs.viewfs.mounttable.link./foo=hdfs://nn02/foo
> {code}
> INodeTree has 2 methods that need change to support nested mount points.
> {code:java}
> createLink(): build INodeTree during fs init.
> resolve(): resolve path in INodeTree with viewfs apis.
> {code}
> ViewFileSystem and ViewFs maintains an INodeTree instance(fsState) in both 
> classes and call fsState.resolve(..) to resolve path to specific mount point. 
> INodeTree.resolve encapsulates the logic of nested mount point resolving. So 
> no changes are expected in both classes. 
> AC:
>  # INodeTree.createlink should support creating nested mount 
> points.(INodeTree is constructed during fs init)
>  # INodeTree.resolve should support resolve path based on nested mount 
> points. (INodeTree.resolve is used in viewfs apis)
>  # No regression in existing ViewFileSystem and ViewFs apis.
>  # Ensure some important apis are not broken with nested mount points. 
> (Rename, getContentSummary, listStatus...)
>  
> Spec:
> Please review attached pdf for spec about this feature.



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