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