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https://issues.apache.org/jira/browse/HADOOP-14607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16066522#comment-16066522
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Kihwal Lee commented on HADOOP-14607:
-------------------------------------
The exception in the namenode log.
{noformat}
2017-02-08 15:18:00,585 [Block report processor] INFO hdfs.StateChange: STATE*
Safe mode ON.
The reported blocks xxx needs additional yyy blocks to reach the threshold
1.0000 of total blocks zzz.
The number of live datanodes qqq has reached the minimum number 0. Safe mode
will be turned off
automatically once the thresholds have been reached.
2017-02-08 15:18:04,946 [1592491027@qtp-922807452-8] ERROR jmx.JMXJsonServlet:
getting attribute LiveNodes of
Hadoop:service=NameNode,name=NameNodeInfo threw an exception
javax.management.RuntimeMBeanException: java.lang.NullPointerException: null
value
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:342)
at
org.apache.hadoop.jmx.JMXJsonServlet.listBeans(JMXJsonServlet.java:320)
at org.apache.hadoop.jmx.JMXJsonServlet.doGet(JMXJsonServlet.java:210)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
... (deleted)
Caused by: java.lang.NullPointerException: null value
at
com.google.common.base.Preconditions.checkNotNull(Preconditions.java:204)
at com.google.common.collect.ImmutableMap.entryOf(ImmutableMap.java:139)
at
com.google.common.collect.ImmutableMap$Builder.put(ImmutableMap.java:178)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getLiveNodes(FSNamesystem.java:7108)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at
com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:193)
at
com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:175)
at
com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:117)
at
com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:54)
at
com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:237)
at
com.sun.jmx.mbeanserver.PerInterface.getAttribute(PerInterface.java:83)
at
com.sun.jmx.mbeanserver.MBeanSupport.getAttribute(MBeanSupport.java:206)
at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:647)
... 34 more
2017-02-08 15:18:04,955 [DecommissionMonitor-0] INFO
blockmanagement.BlockManager: Node 1.2.3.4:1004 hasn't sent its first block
report.
2017-02-08 15:18:04,955 [DecommissionMonitor-0] INFO
blockmanagement.DecommissionManager: Checked 0 blocks and 1 nodes this tick
{noformat}
> NPE while getting list of live nodes via jmx
> --------------------------------------------
>
> Key: HADOOP-14607
> URL: https://issues.apache.org/jira/browse/HADOOP-14607
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.7.3
> Reporter: Kihwal Lee
>
> I saw this back in February during an upgrade. A namenode was restarted and
> all nodes registered, but some didn't block reported. Clicking datanodes tab
> in the web UI wasn't working, but other UI components were working. This got
> resolved later on its own.
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