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From J Mohamed Zahoor <jmo...@gmail.com>
Subject Scan exception when running MR
Date Mon, 22 Oct 2012 15:47:04 GMT
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
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