[ 
https://issues.apache.org/jira/browse/HDFS-15913?focusedWorklogId=570576&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-570576
 ]

ASF GitHub Bot logged work on HDFS-15913:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 23/Mar/21 15:53
            Start Date: 23/Mar/21 15:53
    Worklog Time Spent: 10m 
      Work Description: hadoop-yetus commented on pull request #2805:
URL: https://github.com/apache/hadoop/pull/2805#issuecomment-805017373


   :broken_heart: **-1 overall**
   
   
   
   
   
   
   | Vote | Subsystem | Runtime |  Logfile | Comment |
   |:----:|----------:|--------:|:--------:|:-------:|
   | +0 :ok: |  reexec  |   0m 56s |  |  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 :x: |  test4tests  |   0m  0s |  |  The patch doesn't appear to include 
any new or modified tests. Please justify why no new tests are needed for this 
patch. Also please list what manual steps were performed to verify this patch.  
|
   |||| _ trunk Compile Tests _ |
   | +0 :ok: |  mvndep  |  14m  5s |  |  Maven dependency ordering for branch  |
   | +1 :green_heart: |  mvninstall  |  24m 53s |  |  trunk passed  |
   | +1 :green_heart: |  compile  |   6m  7s |  |  trunk passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04  |
   | +1 :green_heart: |  compile  |   5m 39s |  |  trunk passed with JDK 
Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08  |
   | +1 :green_heart: |  checkstyle  |   1m 28s |  |  trunk passed  |
   | +1 :green_heart: |  mvnsite  |   2m 38s |  |  trunk passed  |
   | +1 :green_heart: |  javadoc  |   1m 56s |  |  trunk passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04  |
   | +1 :green_heart: |  javadoc  |   2m 12s |  |  trunk passed with JDK 
Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08  |
   | +1 :green_heart: |  spotbugs  |   6m 25s |  |  trunk passed  |
   | +1 :green_heart: |  shadedclient  |  21m  4s |  |  branch has no errors 
when building and testing our client artifacts.  |
   |||| _ Patch Compile Tests _ |
   | +0 :ok: |  mvndep  |   0m 22s |  |  Maven dependency ordering for patch  |
   | +1 :green_heart: |  mvninstall  |   2m 25s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |   5m 54s |  |  the patch passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04  |
   | +1 :green_heart: |  javac  |   5m 54s |  |  the patch passed  |
   | +1 :green_heart: |  compile  |   5m 24s |  |  the patch passed with JDK 
Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08  |
   | +1 :green_heart: |  javac  |   5m 24s |  |  the patch passed  |
   | +1 :green_heart: |  blanks  |   0m  1s |  |  The patch has no blanks 
issues.  |
   | +1 :green_heart: |  checkstyle  |   1m 16s |  |  the patch passed  |
   | +1 :green_heart: |  mvnsite  |   2m 26s |  |  the patch passed  |
   | +1 :green_heart: |  javadoc  |   1m 31s |  |  the patch passed with JDK 
Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04  |
   | +1 :green_heart: |  javadoc  |   2m  5s |  |  the patch passed with JDK 
Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08  |
   | +1 :green_heart: |  spotbugs  |   6m 30s |  |  the patch passed  |
   | +1 :green_heart: |  shadedclient  |  20m 58s |  |  patch has no errors 
when building and testing our client artifacts.  |
   |||| _ Other Tests _ |
   | +1 :green_heart: |  unit  |   2m 23s |  |  hadoop-hdfs-client in the patch 
passed.  |
   | -1 :x: |  unit  | 347m 39s | 
[/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2805/1/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt)
 |  hadoop-hdfs in the patch passed.  |
   | +1 :green_heart: |  asflicense  |   0m 37s |  |  The patch does not 
generate ASF License warnings.  |
   |  |   | 484m 23s |  |  |
   
   
   | Reason | Tests |
   |-------:|:------|
   | Failed junit tests | hadoop.hdfs.server.namenode.ha.TestBootstrapStandby |
   |   | hadoop.hdfs.server.namenode.snapshot.TestNestedSnapshots |
   |   | hadoop.hdfs.server.datanode.TestIncrementalBrVariations |
   |   | hadoop.hdfs.server.namenode.ha.TestEditLogTailer |
   |   | hadoop.hdfs.TestPersistBlocks |
   |   | hadoop.hdfs.TestDFSShell |
   |   | hadoop.hdfs.server.datanode.TestDirectoryScanner |
   |   | 
hadoop.hdfs.server.namenode.TestDecommissioningStatusWithBackoffMonitor |
   |   | hadoop.hdfs.server.datanode.fsdataset.impl.TestFsVolumeList |
   |   | hadoop.hdfs.server.namenode.TestDecommissioningStatus |
   |   | hadoop.hdfs.server.datanode.TestBlockScanner |
   |   | hadoop.hdfs.server.diskbalancer.command.TestDiskBalancerCommand |
   
   
   | Subsystem | Report/Notes |
   |----------:|:-------------|
   | Docker | ClientAPI=1.41 ServerAPI=1.41 base: 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2805/1/artifact/out/Dockerfile
 |
   | GITHUB PR | https://github.com/apache/hadoop/pull/2805 |
   | Optional Tests | dupname asflicense compile javac javadoc mvninstall 
mvnsite unit shadedclient spotbugs checkstyle codespell |
   | uname | Linux db8940cbaa13 4.15.0-126-generic #129-Ubuntu SMP Mon Nov 23 
18:53:38 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux |
   | Build tool | maven |
   | Personality | dev-support/bin/hadoop.sh |
   | git revision | trunk / a742fee0277ab832807b05f98dac8b98043a4592 |
   | Default Java | Private Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 |
   | Multi-JDK versions | 
/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.10+9-Ubuntu-0ubuntu1.20.04 
/usr/lib/jvm/java-8-openjdk-amd64:Private 
Build-1.8.0_282-8u282-b08-0ubuntu1~20.04-b08 |
   |  Test Results | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2805/1/testReport/ |
   | Max. process+thread count | 2035 (vs. ulimit of 5500) |
   | modules | C: hadoop-hdfs-project/hadoop-hdfs-client 
hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project |
   | Console output | 
https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-2805/1/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.
   
   


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

    Worklog Id:     (was: 570576)
    Time Spent: 0.5h  (was: 20m)

> Remove useless NULL checks before instanceof
> --------------------------------------------
>
>                 Key: HDFS-15913
>                 URL: https://issues.apache.org/jira/browse/HDFS-15913
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs
>            Reporter: Jiajun Jiang
>            Assignee: Jiajun Jiang
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>         Attachments: HDFS-15913.patch
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Remove useless NULL checks before instanceof in several classes.



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