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https://issues.apache.org/jira/browse/HDFS-17509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17842222#comment-17842222
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ASF GitHub Bot commented on HDFS-17509:
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LiuGuH opened a new pull request, #6784:
URL: https://github.com/apache/hadoop/pull/6784
### Description of PR
As described
[HDFS-17509](https://issues.apache.org/jira/browse/HDFS-17509)
hdfs dfs -concat /tmp/merge /tmp/t1 /tmp/t2
When /tmp/merge is a empty file, this command will throw NPE via DFSRouter.
Because a file via DFSRouter only can be exists in one namespace, so this RP
can implement in this way.
> 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
>
> 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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