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From "edward yoon" <edw...@udanax.org>
Subject Re: Unknown kind of exception.
Date Mon, 18 Feb 2008 09:46:30 GMT
Hmm. I see.

Now i see the 165 line at TableInputFormat.
Can map number be operated with a setNumMapTasks() method?
What is the current split policy?

On 2/18/08, stack <stack@duboce.net> wrote:
> Probably that the lease expired on the scanner your map or reduce task
> was using.  Any other exceptions in the log or does the processing of
> the data to put into hbase take a long time to do?
> St.Ack
>
> edward yoon wrote:
> > I tried scan a 1 thousand * 1 thousand table twice on mapreduce.
> > BTW, What is this exception mean?
> >
> > ----
> > 08/02/18 11:34:53 INFO mapred.JobClient: Task Id :
> > task_200802181109_0002_m_000000_1, Status : FAILED
> > org.apache.hadoop.hbase.UnknownScannerException:
> > org.apache.hadoop.hbase.UnknownScannerException: -4925937627020823950
> >         at org.apache.hadoop.hbase.HRegionServer.close(HRegionServer.java:1543)
> >         at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)
> >         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> >         at java.lang.reflect.Method.invoke(Method.java:597)
> >         at org.apache.hadoop.hbase.ipc.HbaseRPC$Server.call(HbaseRPC.java:413)
> >         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:910)
> >
> >         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> > Method)        at
> > sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> >         at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> >         at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> >         at org.apache.hadoop.hbase.RemoteExceptionHandler.decodeRemoteException(RemoteExceptionHandler.java:82)
> >         at org.apache.hadoop.hbase.HTable$ClientScanner.close(HTable.java:1169)
> >         at org.apache.hadoop.hama.mapred.TableInputFormat$TableRecordReader.close(Unknown
> > Source)
> >         at org.apache.hadoop.mapred.MapTask$TrackedRecordReader.close(MapTask.java:155)
> >         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:212)
> >         at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2065)
> >
> >
>
>


-- 
B. Regards,
Edward yoon @ NHN, corp.

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