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HBase, mail # user - Scan exception when running MR


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Scan exception when running MR
J Mohamed Zahoor 2012-10-22, 15:47
Hi

I am facing a scanner exception like this when i run a mr job.
Both the input and output are hbase tables (different tables)…
This comes sporadically on some mapper and all other mappers runs fine..
Even the failed mapper gets passed in the next attempt.
Any clue on what might be wrong?

java.lang.NullPointerException
at org.apache.hadoop.hbase.client.Scan.<init>(Scan.java:147)
at org.apache.hadoop.hbase.mapreduce.TableInputFormatBase.createRecordReader(TableInputFormatBase.java:123)
at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.<init>(MapTask.java:489)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:731)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1093)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
./zahoor