If you're running so close to the edge of running out of memory that creating a ln process pushes you over the edge, you should fix the broader cause instead of the specific symptom. :)
On Tue, Apr 27, 2010 at 10:09 PM, Lee Parker <l...@socialagency.com> wrote: > So, after reading the thread which Eric posted earlier, I have created a > workaround for the issue. In my backup script, I add a swapfile with > swapon, tell cassandra to create the snapshots, then remove the swapfile > with swapoff. Then I continue with the rest of the work the backup script > needs to do in gathering up the snapshots into a tarball and pushing it to > S3. > > Lee Parker > > On Tue, Apr 27, 2010 at 9:01 PM, Lee Parker <l...@socialagency.com> wrote: >> >> The system is a ubuntu server running 8.04 LTS. Now, I'm getting the >> problem again this evening even with the addition of the swap space. >> >> Lee Parker >> >> On Tue, Apr 27, 2010 at 1:13 PM, Jonathan Shook <jsh...@gmail.com> wrote: >>> >>> The allocation of memory may have failed depending on the available >>> virtual memory, whether or not the memory would have been subsequently >>> accessed by the process. Some systems do the work of allocating physical >>> pages only when they are accessed for the first time. I'm not sure if yours >>> is one of them. >>> >>> On Tue, Apr 27, 2010 at 10:45 AM, Lee Parker <l...@socialagency.com> >>> wrote: >>>> >>>> Adding a swapfile fixed the error, but it doesn't look as though the >>>> process is even using the swap file at all. >>>> >>>> Lee Parker >>>> >>>> On Tue, Apr 27, 2010 at 9:49 AM, Eric Hauser <ewhau...@gmail.com> wrote: >>>>> >>>>> Have you read this? >>>>> http://forums.sun.com/thread.jspa?messageID=9734530 >>>>> I don't think EC2 instances have any swap. >>>>> >>>>> >>>>> On Tue, Apr 27, 2010 at 10:16 AM, Lee Parker <l...@socialagency.com> >>>>> wrote: >>>>>> >>>>>> Can anyone help with this? It is preventing me from getting backups >>>>>> of our cluster. >>>>>> >>>>>> Lee Parker >>>>>> >>>>>> On Mon, Apr 26, 2010 at 10:02 PM, Lee Parker <l...@socialagency.com> >>>>>> wrote: >>>>>>> >>>>>>> I was attempting to get a snapshot on our cassandra nodes. I get the >>>>>>> following error every time I run nodetool ... snapshot. >>>>>>> Exception in thread "main" java.io.IOException: Cannot run program >>>>>>> "ln": java.io.IOException: error=12, Cannot allocate memory >>>>>>> at java.lang.ProcessBuilder.start(ProcessBuilder.java:459) >>>>>>> at >>>>>>> org.apache.cassandra.io.util.FileUtils.createHardLink(FileUtils.java:221) >>>>>>> at >>>>>>> org.apache.cassandra.db.ColumnFamilyStore.snapshot(ColumnFamilyStore.java:1060) >>>>>>> at org.apache.cassandra.db.Table.snapshot(Table.java:256) >>>>>>> at >>>>>>> org.apache.cassandra.service.StorageService.takeAllSnapshot(StorageService.java:1005) >>>>>>> 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.invoke(PerInterface.java:120) >>>>>>> at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:262) >>>>>>> at >>>>>>> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836) >>>>>>> at >>>>>>> com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:761) >>>>>>> at >>>>>>> javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1426) >>>>>>> at >>>>>>> javax.management.remote.rmi.RMIConnectionImpl.access$200(RMIConnectionImpl.java:72) >>>>>>> at >>>>>>> javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1264) >>>>>>> at >>>>>>> javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1359) >>>>>>> at >>>>>>> javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:788) >>>>>>> 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 >>>>>>> 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$ConnectionHandler.run(TCPTransport.java:649) >>>>>>> at >>>>>>> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) >>>>>>> at >>>>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) >>>>>>> at java.lang.Thread.run(Thread.java:619) >>>>>>> Caused by: java.io.IOException: java.io.IOException: error=12, Cannot >>>>>>> allocate memory >>>>>>> at java.lang.UNIXProcess.<init>(UNIXProcess.java:148) >>>>>>> at java.lang.ProcessImpl.start(ProcessImpl.java:65) >>>>>>> at java.lang.ProcessBuilder.start(ProcessBuilder.java:452) >>>>>>> ... 34 more >>>>>>> The nodes are both Amazon EC2 Large instances with 7.5G RAM (6 >>>>>>> allocated for Java heap) with two cores and only 70G of data in >>>>>>> casssandra. >>>>>>> They have plenty of available RAM and HD space. Has anyone else run >>>>>>> into >>>>>>> this error? >>>>>>> >>>>>>> Lee Parker >>>>> >>>> >>> >> > > -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
