Hi,

I am trying to taking snapshot of my data but faced following error. Please help me to resolve this issue.

[root@cassandra1 bin]# ./nodetool -h localhost snapshot 20120711
Exception in thread "main" java.io.IOError: java.io.IOException: Cannot run program "ln": java.io.IOException: error=12, Cannot allocate memory
        at org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(ColumnFamilyStore.java:1660)
        at org.apache.cassandra.db.ColumnFamilyStore.snapshot(ColumnFamilyStore.java:1686)
        at org.apache.cassandra.db.Table.snapshot(Table.java:198)
        at org.apache.cassandra.service.StorageService.takeSnapshot(StorageService.java:1393)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:111)
        at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:45)
        at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:226)
        at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:138)
        at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:251)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:857)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:795)
        at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1450)
        at javax.management.remote.rmi.RMIConnectionImpl.access$200(RMIConnectionImpl.java:90)
        at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1285)
        at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1383)
        at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:807)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
        at sun.rmi.transport.Transport$1.run(Transport.java:177)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:636)
Caused by: java.io.IOException: Cannot run program "ln": java.io.IOException: error=12, Cannot allocate memory
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:475)
        at org.apache.cassandra.utils.CLibrary.createHardLinkWithExec(CLibrary.java:181)
        at org.apache.cassandra.utils.CLibrary.createHardLink(CLibrary.java:147)
        at org.apache.cassandra.io.sstable.SSTableReader.createLinks(SSTableReader.java:730)
        at org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(ColumnFamilyStore.java:1653)
        ... 33 more
Caused by: java.io.IOException: java.io.IOException: error=12, Cannot allocate memory
        at java.lang.UNIXProcess.<init>(UNIXProcess.java:164)
        at java.lang.ProcessImpl.start(ProcessImpl.java:81)
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:468)
        ... 37 more


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Thanks & Regards

Adeel Akbar