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
[email protected]
