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HBase, mail # user - Scan exception when running MR


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Re: Scan exception when running MR
J Mohamed Zahoor 2012-10-22, 15:51
I am using 0.94.1

./zahoor
On 22-Oct-2012, at 9:17 PM, J Mohamed Zahoor <[EMAIL PROTECTED]> wrote:

> 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