CASSANDRA-4230 is a bug in 1.1 I am not aware of issues using snapshot on 1.0.9. But errno 0 is a bit odd.
On the server side there should be a log message at ERROR level that contains the string "Unable to create hard link" and the error message. What does that say ? Can you also include the OS version. Cheers ----------------- Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 28/05/2012, at 9:27 PM, Alain RODRIGUEZ wrote: > I have the same error with the last Datastax AMI (1.0.9). Is that the same > bug ? > > Requested snapshot for: cassa_teads > Exception in thread "main" java.io.IOError: java.io.IOException: > Unable to create hard link from > /raid0/cassandra/data/cassa_teads/stats_product-hc-233-Index.db to > /raid0/cassandra/data/cassa_teads/snapshots/20120528/stats_product-hc-233-Index.db > (errno 0) > at > org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(ColumnFamilyStore.java:1433) > at > org.apache.cassandra.db.ColumnFamilyStore.snapshot(ColumnFamilyStore.java:1462) > at org.apache.cassandra.db.Table.snapshot(Table.java:210) > at > org.apache.cassandra.service.StorageService.takeSnapshot(StorageService.java:1710) > 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:1427) > at > javax.management.remote.rmi.RMIConnectionImpl.access$200(RMIConnectionImpl.java:72) > at > javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1265) > at > javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1360) > at > javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:788) > at sun.reflect.GeneratedMethodAccessor50.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:303) > 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:662) > Caused by: java.io.IOException: Unable to create hard link from > /raid0/cassandra/data/cassa_teads/stats_product-hc-233-Index.db to > /raid0/cassandra/data/cassa_teads/snapshots/20120528/stats_product-hc-233-Index.db > (errno 0) > at > org.apache.cassandra.utils.CLibrary.createHardLink(CLibrary.java:158) > at > org.apache.cassandra.io.sstable.SSTableReader.createLinks(SSTableReader.java:857) > at > org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(ColumnFamilyStore.java:1412) > ... 32 more > > Can we do a snapshot manually (like flushing and after copying all the > file into the snapshot folder) ? > > Alain > > 2012/5/19 Jonathan Ellis <jbel...@gmail.com>: >> When these bugs are fixed: >> https://issues.apache.org/jira/secure/IssueNavigator.jspa?reset=true&jqlQuery=project+%3D+CASSANDRA+AND+fixVersion+%3D+%221.1.1%22+AND+resolution+%3D+Unresolved+ORDER+BY+due+ASC%2C+priority+DESC%2C+created+ASC&mode=hide >> >> On Wed, May 16, 2012 at 6:35 PM, Bryan Fernandez <bfernande...@gmail.com> >> wrote: >>> Does anyone know when 1.1.1 will be released? >>> >>> Thanks. >>> >>> On Tue, May 15, 2012 at 5:40 PM, Brandon Williams <dri...@gmail.com> wrote: >>>> >>>> Probably https://issues.apache.org/jira/browse/CASSANDRA-4230 >>>> >>>> On Tue, May 15, 2012 at 4:08 PM, Bryan Fernandez <bfernande...@gmail.com> >>>> wrote: >>>>> Greetings, >>>>> >>>>> We recently upgraded from 1.0.8 to 1.1.0. Everything has been running >>>>> fine >>>>> with the exception of snapshots. When attempting to snapshot any of the >>>>> nodes in our six node cluster we are seeing the following error. >>>>> >>>>> [root@cassandra-n6 blotter]# /opt/apache-cassandra-1.1.0/bin/nodetool -h >>>>> 10.20.50.58 snapshot >>>>> Requested snapshot for: all keyspaces >>>>> Exception in thread "main" java.io.IOError: java.io.IOException: Unable >>>>> to >>>>> create hard link from >>>>> /var/lib/cassandra/data/blotter/twitter_users/twitter_users.json to >>>>> >>>>> /var/lib/cassandra/data/blotter/twitter_users/snapshots/1337115022389/twitter_users.json >>>>> (errno 17) >>>>> at >>>>> >>>>> org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(ColumnFamilyStore.java:1454) >>>>> at >>>>> >>>>> org.apache.cassandra.db.ColumnFamilyStore.snapshot(ColumnFamilyStore.java:1483) >>>>> at org.apache.cassandra.db.Table.snapshot(Table.java:205) >>>>> at >>>>> >>>>> org.apache.cassandra.service.StorageService.takeSnapshot(StorageService.java:1793) >>>>> 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:1427) >>>>> at >>>>> >>>>> javax.management.remote.rmi.RMIConnectionImpl.access$200(RMIConnectionImpl.java:72) >>>>> at >>>>> >>>>> javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1265) >>>>> at >>>>> >>>>> javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1360) >>>>> 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:303) >>>>> 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:662) >>>>> Caused by: java.io.IOException: Unable to create hard link from >>>>> /var/lib/cassandra/data/blotter/twitter_users/twitter_users.json to >>>>> >>>>> /var/lib/cassandra/data/blotter/twitter_users/snapshots/1337115022389/twitter_users.json >>>>> (errno 17) >>>>> at org.apache.cassandra.utils.CLibrary.createHardLink(CLibrary.java:163) >>>>> at >>>>> >>>>> org.apache.cassandra.db.Directories.snapshotLeveledManifest(Directories.java:343) >>>>> at >>>>> >>>>> org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(ColumnFamilyStore.java:1450) >>>>> ... 33 more >>>>> >>>>> >>>>> However, an LS shows that both of these JSON files exist on the >>>>> filesystem >>>>> (although slightly different sizes). >>>>> >>>>> [root@cassandra-n6 blotter]# ls -al >>>>> /var/lib/cassandra/data/blotter/twitter_users/twitter_users.json >>>>> -rw-r--r-- 1 root root 38786 May 15 20:51 >>>>> /var/lib/cassandra/data/blotter/twitter_users/twitter_users.json >>>>> >>>>> [root@cassandra-n6 blotter]# ls -al >>>>> >>>>> /var/lib/cassandra/data/blotter/twitter_users/snapshots/1337115022389/twitter_users.json >>>>> -rw-r--r-- 1 root root 38778 May 15 20:50 >>>>> >>>>> /var/lib/cassandra/data/blotter/twitter_users/snapshots/1337115022389/twitter_users.json >>>>> >>>>> >>>>> We are using Leveled Compaction on the twitter_users CF with I assume is >>>>> creating the JSON files. >>>>> >>>>> [root@cassandra-n6 blotter]# ls -al >>>>> /var/lib/cassandra/data/blotter/twitter_users/*.json >>>>> -rw-r--r-- 1 root root 38779 May 15 20:51 >>>>> /var/lib/cassandra/data/blotter/twitter_users/twitter_users.json >>>>> -rw-r--r-- 1 root root 38779 May 15 20:51 >>>>> /var/lib/cassandra/data/blotter/twitter_users/twitter_users-old.json >>>>> -rw-r--r-- 1 root root 1040 May 15 20:51 >>>>> >>>>> /var/lib/cassandra/data/blotter/twitter_users/twitter_users.twitter_user_attributes_screenname_idx.json >>>>> -rw-r--r-- 1 root root 1046 May 15 20:50 >>>>> >>>>> /var/lib/cassandra/data/blotter/twitter_users/twitter_users.twitter_user_attributes_screenname_idx-old.json >>>>> >>>>> >>>>> The other column families which are not using Leveled Compaction seem to >>>>> have their snapshots created successfully. >>>>> >>>>> Any ideas other than turning off Leveled Compaction? >>>>> >>>>> >>>>> Thanks, >>>>> >>>>> Brian >>>>> >>>>> >>>>> >>>>> >>> >>> >> >> >> >> -- >> Jonathan Ellis >> Project Chair, Apache Cassandra >> co-founder of DataStax, the source for professional Cassandra support >> http://www.datastax.com
