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https://issues.apache.org/jira/browse/HDFS-16733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17581865#comment-17581865
 ] 

ASF GitHub Bot commented on HDFS-16733:
---------------------------------------

hadoop-yetus commented on PR #4761:
URL: https://github.com/apache/hadoop/pull/4761#issuecomment-1220712179

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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> Improve INode#isRoot()
> ----------------------
>
>                 Key: HDFS-16733
>                 URL: https://issues.apache.org/jira/browse/HDFS-16733
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 3.3.0
>            Reporter: JiangHua Zhu
>            Assignee: JiangHua Zhu
>            Priority: Major
>              Labels: pull-request-available
>
> When constructing an INodeFile or INodeDirectory, it is usually necessary to 
> give a name. For getLocalNameBytes, there are not many restrictions, such as 
> null can be set. But an exception is thrown:
> {code:java}
> INodeDirectory root = new INodeDirectory(HdfsConstants.GRANDFATHER_INODE_ID, 
> null, perm, 0L);
> {code}
> Some exceptions:
> {code:java}
> java.lang.NullPointerException
>       at org.apache.hadoop.hdfs.server.namenode.INode.isRoot(INode.java:78)
> {code}
> Although these situations rarely occur in production environments, we should 
> refine the implementation of isRoot() to avoid this exception. This can 
> enhance system robustness.



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