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From Dru Jensen <drujen...@gmail.com>
Subject Unknown Scanner Exception
Date Mon, 11 Aug 2008 18:35:59 GMT
What causes the following error?  It's coming from the  
TableInputFormatBase class.  It seems to be fairly random for me.

 From what I've read so far, its related to a timeout error?  I   
verified my map task doesn't take long to process.  Anything else that  
may cause this?

org.apache.hadoop.hbase.UnknownScannerException:  
org.apache.hadoop.hbase.UnknownScannerException: Name:  
4797186499140551292
	at  
org 
.apache 
.hadoop.hbase.regionserver.HRegionServer.next(HRegionServer.java:1115)
	at sun.reflect.GeneratedMethodAccessor4.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$Server.call(HbaseRPC.java:473)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:896)

	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:885)
	at org.apache.hadoop.hbase.client.HTable 
$ClientScanner.next(HTable.java:1321)
	at org.apache.hadoop.hbase.mapred.TableInputFormatBase 
$TableRecordReader.next(TableInputFormatBase.java:202)
	at org.apache.hadoop.hbase.mapred.TableInputFormatBase 
$TableRecordReader.next(TableInputFormatBase.java:84)
	at org.apache.hadoop.mapred.MapTask 
$TrackedRecordReader.next(MapTask.java:158)
	at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:45)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:219)
	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java: 
2124)
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