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https://issues.apache.org/jira/browse/HDFS-17509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17845287#comment-17845287
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ASF GitHub Bot commented on HDFS-17509:
---------------------------------------
LiuGuH commented on code in PR #6784:
URL: https://github.com/apache/hadoop/pull/6784#discussion_r1596579974
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hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterRpc.java:
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@@ -1224,6 +1224,17 @@ public void testProxyConcatFile() throws Exception {
String badPath = "/unknownlocation/unknowndir";
compareResponses(routerProtocol, nnProtocol, m,
new Object[] {badPath, new String[] {routerFile}});
+
+ // Test when concat trg is a empty file
Review Comment:
When there is a empty source file, it will throw exception in namenode.
This behaiver is as same as with dfsrouter.
And when trg is a empty file, it is diffrent . Without dfsrouter ,it
success. And with dfsrouter, it will throw Exception.
So I think there is no need to check the empty source file. Or implement
it in another PR.
> 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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