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From Terry Healy <the...@bnl.gov>
Subject AVRO M/R: ClassNotFoundException: ...Paranamer
Date Thu, 13 Dec 2012 19:21:57 GMT
Using Avro 1.7.3 with hadoop-0.20.2 Under MapR M3.

I have sucessfully used AVRO in Non-Map/Reduce jobs to read and write
AVRO format from HDFS. Now I'm running code based on the
AvroGenericMaxTemperature example in Chapter 4 of Tom White's "Hadoop -
The definitive Guide" to convert many large .tsv files to AVRO format.

My code uses the DistributedCache.addFileToClassPath() method to pass
avro-1.7.3.jar and avro-mapred-1.7.3-hadoop1.jar to the TT.

When run, all the map jobs fail due to: ClassNotFoundException:

I did a lot of digging around and wound up using the DistributedCache to
pass avro-tools-1.6.1.jar in an attempt to resolve this. This goes to
hell like this:

java.lang.RuntimeException: Error in configuring object
	at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
	at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:401)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:336)
	at org.apache.hadoop.mapred.Child$4.run(Child.java:270)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)

Any suggestions what I am doing wrong here?


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