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From Bryce Godfrey <>
Subject Problem after upgrade to 1.0.1
Date Thu, 03 Nov 2011 18:39:51 GMT
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(
        at org.apache.cassandra.db.DataTracker.getMeanRowSize(
        at org.apache.cassandra.db.ColumnFamilyStore.getMeanRowSize(
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(
        at java.lang.reflect.Method.invoke(
        at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(
        at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(
        at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(
        at com.sun.jmx.mbeanserver.PerInterface.getAttribute(
        at com.sun.jmx.mbeanserver.MBeanSupport.getAttribute(
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(
        at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(
        at sun.reflect.GeneratedMethodAccessor15.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(
        at java.lang.reflect.Method.invoke(
        at sun.rmi.server.UnicastServerRef.dispatch(
        at sun.rmi.transport.Transport$
        at Method)
        at sun.rmi.transport.Transport.serviceCall(
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(
        at sun.rmi.transport.tcp.TCPTransport$
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(
        at java.util.concurrent.ThreadPoolExecutor$

Bryce Godfrey | Sr. Software Engineer | Azaleos Corporation<>
| T: 206.926.1978 | M: 206.849.2477

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