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https://issues.apache.org/jira/browse/HDFS-13869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596555#comment-16596555
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Íñigo Goiri commented on HDFS-13869:
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>From the trace, it looks like the null part is {{getFederationMetrics()}}, so
>it's not like router is null but {{this.router.getMetrics()}}.
I'm not completely sure what the issue is here.
We would also need a unit test to reproduce your particular case.
> RBF: Handle NPE for NamenodeBeanMetrics#getFederationMetrics()
> --------------------------------------------------------------
>
> Key: HDFS-13869
> URL: https://issues.apache.org/jira/browse/HDFS-13869
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Surendra Singh Lilhore
> Assignee: Ranith Sardar
> Priority: Major
> Attachments: HDFS-13869.patch
>
>
> {code:java}
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.federation.metrics.NamenodeBeanMetrics.getUsed(NamenodeBeanMetrics.java:205)
> at
> org.apache.hadoop.hdfs.server.federation.metrics.NamenodeBeanMetrics.getCapacityUsed(NamenodeBeanMetrics.java:519)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43){code}
> ngMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
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