[CASSANDRA-4318] Nodetool compactionstats fails with NullPointerException

• Type: Bug
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 1.1.2
• Labels: caching

Environment

2 node cluster running on Ubuntu 10.10 64-bit
16GB Max Heap allocated to each node.
Test keyspace using replication factor 2

• Severity: Low
• Assignee: Jonathan Ellis
• Reporter: David B

Authors

Jonathan Ellis

Reviewers

Pavel Yaskevich

• Created: 07/Jun/12 22:25
• Updated: 16/Apr/19 09:32
• Resolved: 09/Jun/12 15:37

Description

Test uses Column family C defined as follows:

create column family C with caching = 'keys_only' and key_validation_class = 'LongType' and compression_options =

{ sstable_compression: SnappyCompressor, chunk_length_kb: 64 }

and max_compaction_threshold=0;

max_compaction_threshold is set to 0 to disable auto compaction.

SSTables are streamed via sstableloader, after which a major compaction is triggered using "nodetool compact MyKeyspace C".

Thereafter, attempts to request compaction stats via "nodetool compactionstats" fail with the following exception:

Exception in thread "main" java.lang.NullPointerException
at org.apache.cassandra.db.compaction.CompactionInfo.asMap(CompactionInfo.java:103)
at org.apache.cassandra.db.compaction.CompactionManager.getCompactions(CompactionManager.java:1115)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:93)
at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:27)
at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:208)
at com.sun.jmx.mbeanserver.PerInterface.getAttribute(PerInterface.java:65)
at com.sun.jmx.mbeanserver.MBeanSupport.getAttribute(MBeanSupport.java:216)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:666)
at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:638)
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1404)
at javax.management.remote.rmi.RMIConnectionImpl.access$200(RMIConnectionImpl.java:72)
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1265)
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1360)
at javax.management.remote.rmi.RMIConnectionImpl.getAttribute(RMIConnectionImpl.java:600)
at sun.reflect.GeneratedMethodAccessor12.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:303)
at sun.rmi.transport.Transport$1.run(Transport.java:159)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)