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https://issues.apache.org/jira/browse/HDFS-17509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17843625#comment-17843625
 ] 

ASF GitHub Bot commented on HDFS-17509:
---------------------------------------

hadoop-yetus commented on PR #6784:
URL: https://github.com/apache/hadoop/pull/6784#issuecomment-2095193170

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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> RBF: Fix ClientProtocol.concat  will throw NPE if tgr is a empty file.
> ----------------------------------------------------------------------
>
>                 Key: HDFS-17509
>                 URL: https://issues.apache.org/jira/browse/HDFS-17509
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: liuguanghua
>            Priority: Minor
>              Labels: pull-request-available
>
> hdfs dfs -concat  /tmp/merge /tmp/t1 /tmp/t2
> When /tmp/merge is a empty file, this command will throw NPE via DFSRouter. 
>  
>  



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