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chukwa collector
Our chukwa collector crashed 。
And the log showed
2011-10-20 04:08:27,847 WARN Timer-817 SeqFileWriter - Got an exception in
rotate
org.apache.hadoop.ipc.RemoteException:
org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException: No lease on
/chukwa/logs/2011102008_s0281.hostsud.net.chukwa File does not exist.
[Lease.  Holder: DFSClient_395554495, pendingcreates: 1]
        at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:1490)
        at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkLease(FSNamesystem.java:1481)
        at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.completeFileInternal(FSNamesystem.java:1536)
        at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.completeFile(FSNamesystem.java:1524)
        at
org.apache.hadoop.hdfs.server.namenode.NameNode.complete(NameNode.java:665)
        at sun.reflect.GeneratedMethodAccessor1374.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:557)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1416)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1412)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1410)

        at org.apache.hadoop.ipc.Client.call(Client.java:1104)
        at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:226)
        at $Proxy0.complete(Unknown Source)
        at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at
org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82)
        at
org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
        at $Proxy0.complete(Unknown Source)
        at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.closeInternal(DFSClient.java:3558)
        at
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.close(DFSClient.java:3472)
        at
org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:61)
        at
org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:86)
        at
org.apache.hadoop.chukwa.datacollection.writer.SeqFileWriter.rotate(SeqFileWriter.java:199)
        at
org.apache.hadoop.chukwa.datacollection.writer.SeqFileWriter$1.run(SeqFileWriter.java:240)
        at java.util.TimerThread.mainLoop(Timer.java:512)
        at java.util.TimerThread.run(Timer.java:462)
2011-10-20 04:08:27,848 FATAL Timer-817 SeqFileWriter - IO Exception in
rotate. Exiting!
2011-10-20 04:08:27,851 WARN Shutdown SeqFileWriter - cannot rename dataSink
file:/chukwa/logs/2011102008_s0281.hostsud.net.chukwa
java.io.IOException: Filesystem closed
        at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:232)
        at org.apache.hadoop.hdfs.DFSClient.rename(DFSClient.java:606)
        at
org.apache.hadoop.hdfs.DistributedFileSystem.rename(DistributedFileSystem.java:224)
        at
org.apache.hadoop.chukwa.datacollection.writer.SeqFileWriter.close(SeqFileWriter.java:327)
        at
org.apache.hadoop.chukwa.datacollection.writer.SocketTeeWriter.close(SocketTeeWriter.java:268)
        at
org.apache.hadoop.chukwa.datacollection.writer.PipelineStageWriter.close(PipelineStageWriter.java:46)
        at
org.apache.hadoop.chukwa.datacollection.collector.servlet.ServletCollector.destroy(ServletCollector.java:227)
        at
org.mortbay.jetty.servlet.ServletHolder.destroyInstance(ServletHolder.java:315)
        at
org.mortbay.jetty.servlet.ServletHolder.doStop(ServletHolder.java:286)
        at
org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:64)
        at
org.mortbay.jetty.servlet.ServletHandler.doStop(ServletHandler.java:170)
        at
org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:64)
        at
org.mortbay.jetty.handler.HandlerWrapper.doStop(HandlerWrapper.java:142)
        at
org.mortbay.jetty.servlet.SessionHandler.doStop(SessionHandler.java:124)
        at
org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:64)
        at
org.mortbay.jetty.handler.HandlerWrapper.doStop(HandlerWrapper.java:142)
        at
org.mortbay.jetty.handler.ContextHandler.doStop(ContextHandler.java:569)
        at
org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:64)
        at
org.mortbay.jetty.handler.HandlerWrapper.doStop(HandlerWrapper.java:142)
        at org.mortbay.jetty.Server.doStop(Server.java:281)
        at
org.mortbay.component.AbstractLifeCycle.stop(AbstractLifeCycle.java:64)
        at org.mortbay.jetty.Server$ShutdownHookThread.run(Server.java:559)

What does this mean?

Best regards,

Ivy Tang