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From Jeff Whiting <je...@qualtrics.com>
Subject MR hbase export is failing
Date Tue, 24 Jul 2012 18:52:38 GMT
What would cause a scanner timeout exception?  Is hdfs too slow?  Do I just increase the scanner

timeout or is there a better approach.

Thanks,
~Jeff

running: hadoop jar /usr/lib/hbase/hbase-0.90.1-CDH3B4.jar export -D dfs.replication=2 -D

mapred.output.compress=true -D 
mapred.output.compression.codec=org.apache.hadoop.io.compress.GzipCodec -D 
mapred.output.compression.type=BLOCK response /hbaseBackup/
partial/2012-07-20_2012-07-21/response 1 1342742400000 1342828800000
org.apache.hadoop.hbase.client.ScannerTimeoutException: 61294ms passed since the last invocation,

timeout is currently set to 60000
         at org.apache.hadoop.hbase.client.HTable$ClientScanner.next(HTable.java:1114)
         at 
org.apache.hadoop.hbase.mapreduce.TableRecordReaderImpl.nextKeyValue(TableRecordReaderImpl.java:143)
         at org.apache.hadoop.hbase.mapreduce.TableRecordReader.nextKeyValue(TableRecordReader.java:142)
         at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:455)
         at org.apache.hadoop.mapreduce.MapContext.nextKeyValue(MapContext.java:67)
         at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:143)
         at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:646)
         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:322)
         at org.apache.hadoop.mapred.Child$4.run(Child.java:240)
         at java.security.AccessController.doPrivileged(Native Method)
         at javax.security.auth.Subject.doAs(Subject.java:396)
         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115)
         at org.apache.hadoop.mapred.Child.main(Child.java:234)
Caused by: org.apache.hadoop.hbase.UnknownScannerException: 
org.apache.hadoop.hbase.UnknownScannerException: Name: -3564751891935236449
         at org.apache.hadoop.hbase.regionserver.HRegionServer.next(HRegionServer.java:1795)
         at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)
         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
         at java.lang.reflect.Method.invoke(Method.java:597)
         at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:570)
         at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1039)

         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:96)
         at org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:83)
         at org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:38)
         at 
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionServerWithRetries(HConnectionManager.java:1000)
         at org.apache.hadoop.hbase.client.HTable$ClientScanner.next(HTable.java:1100)
         ... 12 more

-- 
Jeff Whiting
Qualtrics Senior Software Engineer
jeffw@qualtrics.com


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