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https://issues.apache.org/jira/browse/HDFS-14030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668464#comment-16668464
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Adam Antal commented on HDFS-14030:
-----------------------------------
Thanks for the comment, [~jojochuang].
Yes, I primarily wanted to suppress the NPE, but as the flag will have no
practical use, and the {{Preconditions.checkNotNull}} is justified in
{{DataNode#getVolumeInfo}}, I think it's a Won't fix.
I hope I understand correctly: if the DN has not been inited yet, it will turn
out if {{/jmx}} is queried. So the error can be practically suppressed by
querying {{/jmx}}.
> Add query whether storage has been initialized to DN's JMXBean
> --------------------------------------------------------------
>
> Key: HDFS-14030
> URL: https://issues.apache.org/jira/browse/HDFS-14030
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Reporter: Adam Antal
> Assignee: Adam Antal
> Priority: Minor
> Attachments: HDFS-14030.001.patch
>
>
> During the short period while the DN is starting and the storage is not yet
> available we get the following errors:
> {noformat}
> ERROR org.apache.hadoop.jmx.JMXJsonServlet: getting attribute VolumeInfo of
> Hadoop:service=DataNode,name=DataNodeInfo threw an exception
> javax.management.RuntimeMBeanException: java.lang.NullPointerException:
> Storage not yet initialized
> {noformat}
> I suggest to add an option to the DataNodeMXBean to query whether the storage
> has been initialized or not to surpass the exception.
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