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https://issues.apache.org/jira/browse/HDFS-8548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15314619#comment-15314619
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Ted Yu commented on HDFS-8548:
------------------------------
Can this be backported to 2.7 branch ?
Thanks
> Minicluster throws NPE on shutdown
> ----------------------------------
>
> Key: HDFS-8548
> URL: https://issues.apache.org/jira/browse/HDFS-8548
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: Mike Drob
> Assignee: Surendra Singh Lilhore
> Labels: reviewed
> Fix For: 2.8.0
>
> Attachments: HDFS-8548.patch
>
>
> FtAfter running Solr tests, when we attempt to shut down the mini cluster
> that we use for our unit tests, we get an NPE in the clean up thread. The
> test still completes normally, but this generates a lot of extra noise.
> {noformat}
> [junit4] 2> java.lang.reflect.InvocationTargetException
> [junit4] 2> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
> Method)
> [junit4] 2> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> [junit4] 2> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> [junit4] 2> at java.lang.reflect.Method.invoke(Method.java:497)
> [junit4] 2> at
> org.apache.hadoop.metrics2.lib.MethodMetric$2.snapshot(MethodMetric.java:111)
> [junit4] 2> at
> org.apache.hadoop.metrics2.lib.MethodMetric.snapshot(MethodMetric.java:144)
> [junit4] 2> at
> org.apache.hadoop.metrics2.lib.MetricsRegistry.snapshot(MetricsRegistry.java:387)
> [junit4] 2> at
> org.apache.hadoop.metrics2.lib.MetricsSourceBuilder$1.getMetrics(MetricsSourceBuilder.java:79)
> [junit4] 2> at
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.getMetrics(MetricsSourceAdapter.java:195)
> [junit4] 2> at
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.updateJmxCache(MetricsSourceAdapter.java:172)
> [junit4] 2> at
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.getMBeanInfo(MetricsSourceAdapter.java:151)
> [junit4] 2> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getClassName(DefaultMBeanServerInterceptor.java:1804)
> [junit4] 2> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.safeGetClassName(DefaultMBeanServerInterceptor.java:1595)
> [junit4] 2> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.checkMBeanPermission(DefaultMBeanServerInterceptor.java:1813)
> [junit4] 2> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.exclusiveUnregisterMBean(DefaultMBeanServerInterceptor.java:430)
> [junit4] 2> at
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.unregisterMBean(DefaultMBeanServerInterceptor.java:415)
> [junit4] 2> at
> com.sun.jmx.mbeanserver.JmxMBeanServer.unregisterMBean(JmxMBeanServer.java:546)
> [junit4] 2> at
> org.apache.hadoop.metrics2.util.MBeans.unregister(MBeans.java:81)
> [junit4] 2> at
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.stopMBeans(MetricsSourceAdapter.java:227)
> [junit4] 2> at
> org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.stop(MetricsSourceAdapter.java:212)
> [junit4] 2> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl.stopSources(MetricsSystemImpl.java:461)
> [junit4] 2> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl.stop(MetricsSystemImpl.java:212)
> [junit4] 2> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl.shutdown(MetricsSystemImpl.java:592)
> [junit4] 2> at
> org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.shutdownInstance(DefaultMetricsSystem.java:72)
> [junit4] 2> at
> org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.shutdown(DefaultMetricsSystem.java:68)
> [junit4] 2> at
> org.apache.hadoop.hdfs.server.namenode.metrics.NameNodeMetrics.shutdown(NameNodeMetrics.java:145)
> [junit4] 2> at
> org.apache.hadoop.hdfs.server.namenode.NameNode.stop(NameNode.java:822)
> [junit4] 2> at
> org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1720)
> [junit4] 2> at
> org.apache.hadoop.hdfs.MiniDFSCluster.shutdown(MiniDFSCluster.java:1699)
> [junit4] 2> at
> org.apache.solr.cloud.hdfs.HdfsTestUtil.teardownClass(HdfsTestUtil.java:197)
> [junit4] 2> at
> org.apache.solr.core.HdfsDirectoryFactoryTest.teardownClass(HdfsDirectoryFactoryTest.java:67)
> [junit4] 2> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
> Method)
> [junit4] 2> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> [junit4] 2> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> [junit4] 2> at java.lang.reflect.Method.invoke(Method.java:497)
> [junit4] 2> at
> com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1627)
> [junit4] 2> at
> com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:799)
> [junit4] 2> at
> com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
> [junit4] 2> at
> com.carrotsearch.randomizedtesting.rules.SystemPropertiesRestoreRule$1.evaluate(SystemPropertiesRestoreRule.java:57)
> [junit4] 2> at
> org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:46)
> [junit4] 2> at
> com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
> [junit4] 2> at
> org.apache.lucene.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:42)
> [junit4] 2> at
> com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:39)
> [junit4] 2> at
> com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:39)
> [junit4] 2> at
> com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
> [junit4] 2> at
> com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
> [junit4] 2> at
> com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
> [junit4] 2> at
> org.apache.lucene.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:54)
> [junit4] 2> at
> org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:48)
> [junit4] 2> at
> org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:65)
> [junit4] 2> at
> org.apache.lucene.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:55)
> [junit4] 2> at
> com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
> [junit4] 2> at
> com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:365)
> [junit4] 2> at java.lang.Thread.run(Thread.java:745)
> [junit4] 2> Caused by: java.lang.NullPointerException
> [junit4] 2> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlocksMap.size(BlocksMap.java:198)
> [junit4] 2> at
> org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.getTotalBlocks(BlockManager.java:3291)
> [junit4] 2> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlocksTotal(FSNamesystem.java:6223)
> [junit4] 2> ... 54 more
> {noformat}
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