HDFS-17559. Fix the uuid as null in NameNodeMXBean

[haiyang1987]

Description of PR

https://issues.apache.org/jira/browse/HDFS-17559

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:

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)

[hadoop-yetus]

:broken_heart: -1 overall

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+1 :green_heart:	asflicense	0m 44s		The patch does not generate ASF License warnings.
		443m 41s

Reason	Tests
Failed junit tests	hadoop.hdfs.server.blockmanagement.TestDatanodeManager
	hadoop.hdfs.TestRollingUpgrade

Subsystem	Report/Notes
Docker	ClientAPI=1.44 ServerAPI=1.44 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6906/1/artifact/out/Dockerfile
GITHUB PR	https://github.com/apache/hadoop/pull/6906
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Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6906/1/testReport/
Max. process+thread count	2844 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6906/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[hadoop-yetus]

:broken_heart: -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
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			_ Prechecks _
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			_ trunk Compile Tests _
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		447m 0s

Reason	Tests
Failed junit tests	hadoop.hdfs.server.blockmanagement.TestDatanodeManager

Subsystem	Report/Notes
Docker	ClientAPI=1.44 ServerAPI=1.44 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6906/2/artifact/out/Dockerfile
GITHUB PR	https://github.com/apache/hadoop/pull/6906
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Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6906/2/testReport/
Max. process+thread count	2845 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6906/2/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[haiyang1987]

The failed unit test seems unrelated to the change.

[haiyang1987]

Hi @Hexiaoqiao @ZanderXu @zhangshuyan0 could you please help me review this pr when you have free time? Thanks~.

[hadoop-yetus]

:broken_heart: -1 overall

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			_ Prechecks _
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		440m 11s

Reason	Tests
Failed junit tests	hadoop.hdfs.server.blockmanagement.TestDatanodeManager

Subsystem	Report/Notes
Docker	ClientAPI=1.44 ServerAPI=1.44 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6906/3/artifact/out/Dockerfile
GITHUB PR	https://github.com/apache/hadoop/pull/6906
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uname	Linux c386d44e5d36 5.15.0-94-generic #104-Ubuntu SMP Tue Jan 9 15:25:40 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
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Max. process+thread count	3048 (vs. ulimit of 5500)
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Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-6906/3/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[haiyang1987]

Thanks for @ayushtkn review and merge.