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https://issues.apache.org/jira/browse/HDFS-13869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16603265#comment-16603265
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Íñigo Goiri commented on HDFS-13869:
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I like the approach in [^HDFS-13869-003.diff] better.
I'm not completely sure if debug log is the best but I don't have a better idea.
The other thing is that we need a unit test for this; ideally, a unit test
which reproduces the environment where this was seen.
As it is right now, I'm not sure how this is happening.
A minor request: can you post the patches as patch instead of diff? The patch
viewer is not happy with it.
> 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-13869-002.diff, HDFS-13869-003.diff,
> 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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