Regarding load growth, presumably you are referring to the load as reported by JMX/nodetool. Have you actually looked at the disk utilization on the nodes themselves? Potential issue I have seen: http://www.mail-archive.com/user@cassandra.apache.org/msg18142.html
Dan From: Bryce Godfrey [mailto:bryce.godf...@azaleos.com] Sent: November-03-11 14:40 To: user@cassandra.apache.org Subject: Problem after upgrade to 1.0.1 I recently upgraded from 0.8.6 to 1.0.1 and everything seemed to go just fine with the rolling upgrade. But now I'm having extreme load growth on one of my nodes (and others are growing faster than usual also). I attempted to run a cfstats against the extremely large node that was seeing 2x the load of others and I get this error below. I'm also went into the o.a.c.db.HintedHandoffManager mbean and attempted to list pending hints to see if it was growing out of control for some reason, but that just times out eventually for any node. I'm not sure what to do next with this issue. Column Family: HintsColumnFamily SSTable count: 3 Space used (live): 12681676437 Space used (total): 10233130272 Number of Keys (estimate): 384 Memtable Columns Count: 117704 Memtable Data Size: 115107307 Memtable Switch Count: 66 Read Count: 0 Read Latency: NaN ms. Write Count: 21203290 Write Latency: 0.014 ms. Pending Tasks: 0 Key cache capacity: 3 Key cache size: 0 Key cache hit rate: NaN Row cache: disabled Compacted row minimum size: 30130993 Compacted row maximum size: 9223372036854775807 Exception in thread "main" java.lang.IllegalStateException: Unable to compute ceiling for max when histogram overflowed at org.apache.cassandra.utils.EstimatedHistogram.mean(EstimatedHistogram.java:1 70) at org.apache.cassandra.db.DataTracker.getMeanRowSize(DataTracker.java:395) at org.apache.cassandra.db.ColumnFamilyStore.getMeanRowSize(ColumnFamilyStore.j ava:293) 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(StandardMBeanIntr ospector.java:93) at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntr ospector.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(DefaultMB eanServerInterceptor.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$200(RMIConnectionImpl.j ava:72) at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMICon nectionImpl.java:1265) at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConne ctionImpl.java:1360) at javax.management.remote.rmi.RMIConnectionImpl.getAttribute(RMIConnectionImpl .java:600) at sun.reflect.GeneratedMethodAccessor15.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:305) 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$ConnectionHandler.run(TCPTransport.java:6 49) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.ja va:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:9 08) at java.lang.Thread.run(Thread.java:662) Bryce Godfrey | Sr. Software Engineer | <http://www.azaleos.com/> Azaleos Corporation | T: 206.926.1978 | M: 206.849.2477 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.920 / Virus Database: 271.1.1/3993 - Release Date: 11/03/11 03:39:00
