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Posted to mapreduce-user@hadoop.apache.org by Mapred Learn <ma...@gmail.com> on 2011/05/11 00:24:20 UTC
Null pointer exception in Mapper initialization
Hi,
I get error like:
java.lang.NullPointerException
at
org.apache.hadoop.io<http://org.apache.hadoop.io.serializer.serializationfactory.ge/>
.serializer.SerializationFactory.getSerializer(SerializationFactory.java:73)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:815)
at
org.apache.hadoop.mapred.MapTask$NewOutputCollector.<init>(MapTask.java:549)
at
org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:631)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:315)
at org.apache.hadoop.mapred.Child$4.run(Child.java:217)
at java.security.AccessController.doPrivileged(Native
Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1063)
at org.apache.hadoop.mapred.Child.main(Child.java:211)
My Mapper key/value are basic Writable types. Could somebody point me to
some clue as to why am I getting this error ?
Thanks,
-JJ
Null pointer exception in Mapper initialization
Posted by Mapred Learn <ma...@gmail.com>.
Hi,
I get error like:
java.lang.NullPointerException
at
org.apache.hadoop.io<http://org.apache.hadoop.io.serializer.serializationfactory.ge/>
.serializer.SerializationFactory.getSerializer(SerializationFactory.java:73)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:815)
at
org.apache.hadoop.mapred.MapTask$NewOutputCollector.<init>(MapTask.java:549)
at
org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:631)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:315)
at org.apache.hadoop.mapred.Child$4.run(Child.java:217)
at java.security.AccessController.doPrivileged(Native
Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1063)
at org.apache.hadoop.mapred.Child.main(Child.java:211)
My Mapper key/value are basic Writable types. Could somebody point me to
some clue as to why am I getting this error ?
Thanks,
-JJ
Null pointer exception in Mapper initialization
Posted by Mapred Learn <ma...@gmail.com>.
Hi,
I get error like:
java.lang.NullPointerException
at
org.apache.hadoop.io<http://org.apache.hadoop.io.serializer.serializationfactory.ge/>
.serializer.SerializationFactory.getSerializer(SerializationFactory.java:73)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:815)
at
org.apache.hadoop.mapred.MapTask$NewOutputCollector.<init>(MapTask.java:549)
at
org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:631)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:315)
at org.apache.hadoop.mapred.Child$4.run(Child.java:217)
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:1063)
at org.apache.hadoop.mapred.Child.main(Child.java:211)
My Mapper key/value are basic Writable types. Could somebody point me to
some clue as to why am I getting this error ?
Thanks,
-JJ