HI all,

This is a test setup so has quickly been configured, and with a nominal amount 
of test data.  Initially, I was getting "'Malformed IPv6 address at index 7" 
errors so I appended "-Dcom.sun.jndi.rmiURLParsing=legacy" which removed that.  
However, snapshots are not being performed.  Is it a problem with the table 
structure?

Requested creating snapshot(s) for [all keyspaces] with snapshot name 
[1667385306975] and options {skipFlush=false}
error: ThreadPoolExecutor has shut down
-- StackTrace --
java.util.concurrent.RejectedExecutionException: ThreadPoolExecutor has shut 
down
        at 
org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor$1.rejectedExecution(DebuggableThreadPoolExecutor.java:70)
        at 
java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:830)
        at 
java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1379)
        at 
org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor.execute(DebuggableThreadPoolExecutor.java:180)
        at 
org.apache.cassandra.db.ColumnFamilyStore.waitForFlushes(ColumnFamilyStore.java:936)
        at 
org.apache.cassandra.db.ColumnFamilyStore.forceFlush(ColumnFamilyStore.java:902)
        at 
org.apache.cassandra.db.ColumnFamilyStore.forceBlockingFlush(ColumnFamilyStore.java:942)
        at 
org.apache.cassandra.db.ColumnFamilyStore.snapshot(ColumnFamilyStore.java:2026)
        at 
org.apache.cassandra.db.ColumnFamilyStore.snapshot(ColumnFamilyStore.java:2004)
        at org.apache.cassandra.db.Keyspace.snapshot(Keyspace.java:258)
        at 
org.apache.cassandra.service.StorageService.takeSnapshot(StorageService.java:3859)
        at 
org.apache.cassandra.service.StorageService.takeSnapshot(StorageService.java:3767)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:72)
        at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:276)
        at 
com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:112)
        at 
com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:46)
        at 
com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:237)
        at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:138)
        at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:252)
        at 
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
        at 
com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
        at 
javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
        at 
javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
        at 
javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
        at 
javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
        at 
javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
        at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
        at sun.rmi.transport.Transport$1.run(Transport.java:200)
        at sun.rmi.transport.Transport$1.run(Transport.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
        at 
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
        at 
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
        at 
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
        at java.security.AccessController.doPrivileged(Native Method)
        at 
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:750)

Nothing seems to get written to system.log or debug.log.

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