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https://issues.apache.org/jira/browse/HDFS-16710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17601387#comment-17601387
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ASF GitHub Bot commented on HDFS-16710:
---------------------------------------

hadoop-yetus commented on PR #4670:
URL: https://github.com/apache/hadoop/pull/4670#issuecomment-1239615570

   :broken_heart: **-1 overall**
   
   
   
   
   
   
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[/patch-mvninstall-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4670/3/artifact/out/patch-mvninstall-hadoop-hdfs-project_hadoop-hdfs.txt)
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[/patch-compile-hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-11.0.16+8-post-Ubuntu-0ubuntu120.04.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4670/3/artifact/out/patch-compile-hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-11.0.16+8-post-Ubuntu-0ubuntu120.04.txt)
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[/patch-compile-hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-11.0.16+8-post-Ubuntu-0ubuntu120.04.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4670/3/artifact/out/patch-compile-hadoop-hdfs-project_hadoop-hdfs-jdkUbuntu-11.0.16+8-post-Ubuntu-0ubuntu120.04.txt)
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[/patch-compile-hadoop-hdfs-project_hadoop-hdfs-jdkPrivateBuild-1.8.0_342-8u342-b07-0ubuntu1~20.04-b07.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4670/3/artifact/out/patch-compile-hadoop-hdfs-project_hadoop-hdfs-jdkPrivateBuild-1.8.0_342-8u342-b07-0ubuntu1~20.04-b07.txt)
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[/patch-mvnsite-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4670/3/artifact/out/patch-mvnsite-hadoop-hdfs-project_hadoop-hdfs.txt)
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[/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4670/3/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt)
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https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4670/3/testReport/ |
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   | modules | C: hadoop-hdfs-project/hadoop-hdfs U: 
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   | Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
   
   
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> Remove redundant throw exceptions in org.apahce.hadoop.hdfs.server.namenode 
> package
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-16710
>                 URL: https://issues.apache.org/jira/browse/HDFS-16710
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: ZanderXu
>            Assignee: ZanderXu
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1.5h
>  Remaining Estimate: 0h
>
> When I read some class about HDFS NameNode, I found there are many redundant 
> throw exception in org.apahce.hadoop.hdfs.server.namenode package, such as:
> {code:java}
> public synchronized void transitionToObserver(StateChangeRequestInfo req)
>     throws ServiceFailedException, AccessControlException, IOException {
>   checkNNStartup();
>   nn.checkHaStateChange(req);
>   nn.transitionToObserver();
> } {code}
> Because ServiceFailedException and AccessControlException is subClass of 
> IOException, so I feel that ServiceFailedException and AccessControlException 
> are redundant, so we can remove it to make code clearer, such as:
> {code:java}
> public synchronized void transitionToObserver(StateChangeRequestInfo req)
>     throws IOException {
>   checkNNStartup();
>   nn.checkHaStateChange(req);
>   nn.transitionToObserver();
> } {code}
>  



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