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https://issues.apache.org/jira/browse/CASSANDRA-11961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15355128#comment-15355128
]
Stefan Podkowinski commented on CASSANDRA-11961:
------------------------------------------------
Missing {{CFMetaData}} from {{CompactionInfo}} can cause other issues as well,
e.g. by calling {{getId()}}.
We got the following exception when calling {{nodetool compactionstats}} on a
2.2 node under heavy load:
{noformat}
java.lang.NullPointerException
at
org.apache.cassandra.db.compaction.CompactionInfo.getId(CompactionInfo.java:68)
at
org.apache.cassandra.db.compaction.CompactionInfo.asMap(CompactionInfo.java:126)
at
org.apache.cassandra.db.compaction.CompactionManager.getCompactions(CompactionManager.java:1548)
at sun.reflect.GeneratedMethodAccessor57.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at
com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:112)
at
com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:46)
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)
at
com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:678)
at
javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1445)
at
javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
at
javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
at
javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
at
javax.management.remote.rmi.RMIConnectionImpl.getAttribute(RMIConnectionImpl.java:639)
at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:323)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
{noformat}
> Nonfatal NPE in CompactionMetrics
> ---------------------------------
>
> Key: CASSANDRA-11961
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11961
> Project: Cassandra
> Issue Type: Bug
> Reporter: Robert Stupp
> Assignee: Achal Shah
> Priority: Minor
> Labels: lhf
> Fix For: 3.8
>
>
> Just saw the following NPE on trunk. Means, that {{metaData}} from
> {{CFMetaData metaData = compaction.getCompactionInfo().getCFMetaData();}} is
> {{null}}. A simple {{if (metaData == null) continue;}} should fix this.
> {code}
> Caused by: java.lang.NullPointerException: null
> at
> org.apache.cassandra.metrics.CompactionMetrics$2.getValue(CompactionMetrics.java:103)
> ~[main/:na]
> at
> org.apache.cassandra.metrics.CompactionMetrics$2.getValue(CompactionMetrics.java:78)
> ~[main/:na]
> {code}
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