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From "Simon Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-12462) NullPointerException in CompactionInfo.getId(CompactionInfo.java:65)
Date Thu, 22 Sep 2016 23:47:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15514830#comment-15514830
] 

Simon Zhou edited comment on CASSANDRA-12462 at 9/22/16 11:46 PM:
------------------------------------------------------------------

I repro'ed the same issue with C* 2.2.5 and C* 3 should have the same issue.  I have a one
line patch as attached. cc the original author of this line @jbellis to take a look.


was (Author: szhou):
I repro'ed the same issue with C* 2.2.5 and C* 3 should have the same issue.  This is a one
line patch:

>From 65d0c7874147910f0d7785a734519efeb9240d78 Mon Sep 17 00:00:00 2001
From: Simon Zhou <szhou@uber.com>
Date: Thu, 22 Sep 2016 16:35:52 -0700
Subject: [PATCH] Fix NPE when running "nodetool compactionstats"

---
 src/java/org/apache/cassandra/db/compaction/CompactionInfo.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/java/org/apache/cassandra/db/compaction/CompactionInfo.java b/src/java/org/apache/cassandra/db/compaction/CompactionInfo.java
index 535217f..d83423f 100644
--- a/src/java/org/apache/cassandra/db/compaction/CompactionInfo.java
+++ b/src/java/org/apache/cassandra/db/compaction/CompactionInfo.java
@@ -65,7 +65,7 @@ public final class CompactionInfo implements Serializable
 
     public UUID getId()
     {
-        return cfm.cfId;
+        return cfm != null ? cfm.cfId : null;
     }
 
     public String getKeyspace()
-- 
2.9.3


> 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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