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https://issues.apache.org/jira/browse/CASSANDRA-12462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15514921#comment-15514921
 ] 

Jeff Jirsa commented on CASSANDRA-12462:
----------------------------------------

When you're seeing this exception, do you have a schema mismatch? Have you 
recently added or removed a keyspace or table?


> NullPointerException in CompactionInfo.getId(CompactionInfo.java:65)
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-12462
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12462
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Compaction
>            Reporter: Jonathan DePrizio
>         Attachments: 0001-Fix-NPE-when-running-nodetool-compactionstats.patch
>
>
> Note: The same trace is cited in the last comment of 
> https://issues.apache.org/jira/browse/CASSANDRA-11961
> I've noticed that some of my nodes in my 2.1 cluster have fallen way behind 
> on compactions, and have huge numbers (thousands) of uncompacted, tiny 
> SSTables (~30MB or so).
> In diagnosing the issue, I've found that "nodetool compactionstats" returns 
> the exception below.  Restarting cassandra on the node here causes the 
> pending tasks count to jump to ~2000.  Compactions run properly for about an 
> hour, until this exception occurs again.  Once it occurs, I see the pending 
> tasks value rapidly drop towards zero, but without any compactions actually 
> running (the logs show no compactions finishing).  It would seem that this is 
> causing compactions to fail on this node, which is leading to it running out 
> of space, etc.
> [redacted]# nodetool compactionstats
> xss =  -ea -javaagent:/usr/share/cassandra/lib/jamm-0.3.0.jar 
> -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 -Xms12G -Xmx12G 
> -Xmn1000M -Xss255k
> pending tasks: 5
> error: null
> -- StackTrace --
> java.lang.NullPointerException
>       at 
> org.apache.cassandra.db.compaction.CompactionInfo.getId(CompactionInfo.java:65)
>       at 
> org.apache.cassandra.db.compaction.CompactionInfo.asMap(CompactionInfo.java:118)
>       at 
> org.apache.cassandra.db.compaction.CompactionManager.getCompactions(CompactionManager.java:1405)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>       at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>       at java.lang.reflect.Method.invoke(Unknown Source)
>       at sun.reflect.misc.Trampoline.invoke(Unknown Source)
>       at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
>       at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>       at java.lang.reflect.Method.invoke(Unknown Source)
>       at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
>       at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(Unknown 
> Source)
>       at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(Unknown 
> Source)
>       at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(Unknown Source)
>       at com.sun.jmx.mbeanserver.PerInterface.getAttribute(Unknown Source)
>       at com.sun.jmx.mbeanserver.MBeanSupport.getAttribute(Unknown Source)
>       at 
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(Unknown 
> Source)
>       at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(Unknown Source)
>       at javax.management.remote.rmi.RMIConnectionImpl.doOperation(Unknown 
> Source)
>       at javax.management.remote.rmi.RMIConnectionImpl.access$300(Unknown 
> Source)
>       at 
> javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(Unknown 
> Source)
>       at 
> javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(Unknown 
> Source)
>       at javax.management.remote.rmi.RMIConnectionImpl.getAttribute(Unknown 
> Source)
>       at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)
>       at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>       at java.lang.reflect.Method.invoke(Unknown Source)
>       at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
>       at sun.rmi.transport.Transport$1.run(Unknown Source)
>       at sun.rmi.transport.Transport$1.run(Unknown Source)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at sun.rmi.transport.Transport.serviceCall(Unknown Source)
>       at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
>       at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown 
> Source)
>       at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown 
> Source)
>       at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
>       at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
>       at java.lang.Thread.run(Unknown Source)



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