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https://issues.apache.org/jira/browse/HDFS-17462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17836146#comment-17836146
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Jian Zhang commented on HDFS-17462:
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[~naihaofan] hi, I can't see your picture, and if you haven't fixed this
problem yet, I can try to fix it.
> 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
> Priority: Minor
>
> When trg of Router concat is an empty file, it will trigger NPE in Router,
> and the concat will fail, example:
> !https://msasg.visualstudio.com/b9b38275-a912-4222-a7b7-0b8b968719c0/_apis/git/repositories/39259a38-581f-4d2a-9dfd-4f4660702c00/pullRequests/4614947/attachments/image%20%284%29.png|width=980,height=229!
> 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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