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https://issues.apache.org/jira/browse/HDFS-13410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16431799#comment-16431799
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Hudson commented on HDFS-13410:
-------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13949 (See 
[https://builds.apache.org/job/Hadoop-trunk-Commit/13949/])
HDFS-13410. RBF: Support federation with no subclusters. Contributed by (yqlin: 
rev a92200f4a6cec57b7080d1cd6e2a20d79d772dd6)
* (edit) 
hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterRpc.java
* (edit) 
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcClient.java
* (edit) 
hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouter.java


> RBF: Support federation with no subclusters
> -------------------------------------------
>
>                 Key: HDFS-13410
>                 URL: https://issues.apache.org/jira/browse/HDFS-13410
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Íñigo Goiri
>            Assignee: Íñigo Goiri
>            Priority: Minor
>         Attachments: HDFS-13410.000.patch, HDFS-13410.001.patch, 
> HDFS-13410.002.patch
>
>
> If the federation has no subclusters the logs have long stack traces. Even 
> though this is not a regular setup for RBF, we should trigger log message.
> An example:
> {code}
> Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
>       at java.util.LinkedList.checkElementIndex(LinkedList.java:555)
>       at java.util.LinkedList.get(LinkedList.java:476)
>       at 
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.invokeConcurrent(RouterRpcClient.java:1028)
>       at 
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.getDatanodeReport(RouterRpcServer.java:1264)
>       at 
> org.apache.hadoop.hdfs.server.federation.metrics.FederationMetrics.getNodeUsage(FederationMetrics.java:424)
> {code}



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