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https://issues.apache.org/jira/browse/HDFS-17462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17836159#comment-17836159
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NaihaoFan commented on HDFS-17462:
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Hi [~Keepromise], thanks for your comment, I will update the picture later.
There is already a fix, I'm working on raising the PR now, and it is verified
inside my team.
> 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:
> 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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