[jira] [Commented] (HDFS-17462) RBF: NPE in Router concat when trg is an empty file.

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-17462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18023455#comment-18023455 ] 

ASF GitHub Bot commented on HDFS-17462:
---------------------------------------

github-actions[bot] commented on PR #6722:
URL: https://github.com/apache/hadoop/pull/6722#issuecomment-3344446626

   We're closing this stale PR because it has been open for 100 days with no activity. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
   If you feel like this was a mistake, or you would like to continue working on it, please feel free to re-open it and ask for a committer to remove the stale tag and review again.
   Thanks all for your contribution.




> RBF: NPE in Router concat when trg is an empty file.
> ----------------------------------------------------
>
>                 Key: HDFS-17462
>                 URL: https://issues.apache.org/jira/browse/HDFS-17462
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.10.2, 3.3.6
>            Reporter: NaihaoFan
>            Assignee: NaihaoFan
>            Priority: Minor
>              Labels: pull-request-available
>
> When trg of Router concat is an empty file, it will trigger NPE in Router, and the concat will fail, example:
> This is because when trg is an empty file, NameNode will return lastLocatedBlock as null in the response of getBlockLocations. And Router will not check null of lastLocatedBlock returned, instead Router will use it to get block pool id directly.
> Trg of concat is an empty file should be allowed in router since this case is supported by concat of NameNode.



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