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From "Samuel Guo" <guosi...@gmail.com>
Subject Re: UnknownScannerException
Date Tue, 04 Nov 2008 03:07:41 GMT
On Tue, Nov 4, 2008 at 10:30 AM, Edward J. Yoon <edwardyoon@apache.org>wrote:

> While matrix-matrix mult, I received a message as below. Does anyone
> know about UnknownScannerException?
>
> ----
> 08/11/04 11:24:57 INFO mapred.JobClient:  map 90% reduce 28%
> 08/11/04 11:24:59 INFO mapred.JobClient:  map 90% reduce 30%
> 08/11/04 11:26:49 INFO mapred.JobClient: Task Id :
> attempt_200811041040_0003_m_000002_0, Status : FAILED
> org.apache.hadoop.hbase.UnknownScannerException:
> org.apache.hadoop.hbase.UnknownScannerException: Name:
> -1151932123796109789
>        at
> org.apache.hadoop.hbase.regionserver.HRegionServer.next(HRegionServer.java:1077)
>        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.hbase.ipc.HbaseRPC$Server.call(HbaseRPC.java:554)
>        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:888)
>
>        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.client.HConnectionManager$TableServers.getRegionServerWithRetries(HConnectionManager.java:856)


I doubt that there may be some region splitting/moving during scanning, so
we get the RemoteException while getRegionServerWithRetires.


>
>        at
> org.apache.hadoop.hbase.client.HTable$ClientScanner.next(HTable.java:1155)
>        at
> org.apache.hama.mapred.MatrixInputFormatBase$TableRecordReader.next(MatrixInputFormatBase.java:174)
>        at
> org.apache.hama.mapred.MatrixInputFormatBase$TableRecordReader.next(MatrixInputFormatBase.java:56)
>        at
> org.apache.hadoop.mapred.MapTask$TrackedRecordReader.next(MapTask.java:165)
>        at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:45)
>        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:227)
>        at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2207)
>
> 08/11/04 11:27:11 INFO mapred.JobClient:  map 100% reduce 30%
> 08/11/04 11:27:17 INFO mapred.JobClient:  map 100% reduce 64%
> 08/11/04 11:27:23 INFO mapred.JobClient: Job complete:
> job_200811041040_0003
> 08/11/04 11:27:23 INFO mapred.JobClient: Counters: 13
> 08/11/04 11:27:23 INFO mapred.JobClient:   File Systems
> 08/11/04 11:27:23 INFO mapred.JobClient:     Local bytes read=32057196
> 08/11/04 11:27:23 INFO mapred.JobClient:     Local bytes written=64599524
>
> --
> Best regards, Edward J. Yoon @ NHN, corp.
> edwardyoon@apache.org
> http://blog.udanax.org
>

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