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Subject: Re: Scan exception when running MR
From: J Mohamed Zahoor <jmozah@gmail.com>
In-Reply-To: <72E0C964-156D-4F89-A05E-8A42AB7796F0@gmail.com>
Date: Mon, 22 Oct 2012 21:21:42 +0530
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To: "user@hbase.apache.org" <user@hbase.apache.org>
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I am using 0.94.1

./zahoor


On 22-Oct-2012, at 9:17 PM, J Mohamed Zahoor <jmozah@gmail.com> wrote:

> Hi
>=20
> I am facing a scanner exception like this when i run a mr job.
> Both the input and output are hbase tables (different tables)=85
> 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?
>=20
> 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.ja=
va: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)
>=20
>=20
> ./zahoor