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https://issues.apache.org/jira/browse/HDFS-17559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17863448#comment-17863448
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ASF GitHub Bot commented on HDFS-17559:
---------------------------------------
ayushtkn merged PR #6906:
URL: https://github.com/apache/hadoop/pull/6906
> Fix the uuid as null in NameNodeMXBean
> --------------------------------------
>
> Key: HDFS-17559
> URL: https://issues.apache.org/jira/browse/HDFS-17559
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Haiyang Hu
> Assignee: Haiyang Hu
> Priority: Major
> Labels: pull-request-available
>
> If there is datanode info in includes, but the datanode service is not
> currently started, the uuid of the datanode will be null.
> when get the DeadNodes DeadNodes metric, the following exception will occur:
> {code:java}
> 2024-06-26 17:06:49,698 ERROR jmx.JMXJsonServlet
> (JMXJsonServlet.java:writeAttribute(345)) [qtp1107412069-7704] - getting
> attribute DeadNodes of Hadoop:service=NameNode,name=NameNodeInfo threw an
> exception javax.management.RuntimeMBeanException:
> java.lang.NullPointerException: null value in entry: uuid=null
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrow(DefaultMBeanServerInterceptor.java:839)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrowMaybeMBeanException(DefaultMBeanServerInterceptor.java:852)
> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:651)
> at
> com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:678)
> at
> org.apache.hadoop.jmx.JMXJsonServlet.writeAttribute(JMXJsonServlet.java:338)
> {code}
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