union handling in ReflectDatumWriter
------------------------------------
Key: AVRO-780
URL: https://issues.apache.org/jira/browse/AVRO-780
Project: Avro
Issue Type: Bug
Components: java
Affects Versions: 1.5.0
Environment: Mac with VMWare running Linux training-vm
2.6.28-19-server #61-Ubuntu
Reporter: ey-chih chow
Our avdl schema definition for the record DeviceRow has a field:
union {array<DynamicColumn4Games>, null} Games__;
When we migrated our MR jobs from 1.4.0 to 1.5.0, we got following messages:
===================================================================================================
11/03/10 11:31:02 INFO mapred.TaskInProgress: Error from
attempt_20110310113041953_0001_m_000000_0: java.lang.NullPointerException: in
com.ngmoco.hbase.DeviceRow in union null of union in field Games__ of
com.ngmoco.hbase.DeviceRow
at
org.apache.avro.reflect.ReflectDatumWriter.write(ReflectDatumWriter.java:104)
at
org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:57)
at
org.apache.avro.mapred.AvroSerialization$AvroWrapperSerializer.serialize(AvroSerialization.java:131)
at
org.apache.avro.mapred.AvroSerialization$AvroWrapperSerializer.serialize(AvroSerialization.java:114)
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:900)
at
org.apache.hadoop.mapred.MapTask$OldOutputCollector.collect(MapTask.java:466)
at
org.apache.avro.mapred.HadoopMapper$MapCollector.collect(HadoopMapper.java:69)
at
com.ngmoco.ngpipes.sourcing.NgActivityGatheringMapper.map(NgActivityGatheringMapper.java:91)
at
com.ngmoco.ngpipes.sourcing.NgActivityGatheringMapper.map(NgActivityGatheringMapper.java:1)
at org.apache.avro.mapred.HadoopMapper.map(HadoopMapper.java:80)
at org.apache.avro.mapred.HadoopMapper.map(HadoopMapper.java:34)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
at org.apache.hadoop.mapred.Child.main(Child.java:170)
Caused by: java.lang.NullPointerException: in union null of union in field
Games__ of com.ngmoco.hbase.DeviceRow
at
org.apache.avro.generic.GenericDatumWriter.npe(GenericDatumWriter.java:92)
at
org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:86)
at
org.apache.avro.reflect.ReflectDatumWriter.write(ReflectDatumWriter.java:102)
... 14 more
===================================================================================================
After we change definition of the field Games__ to:
union {null, array<DynamicColumn4Games>} Games__;
The system stop complaining.
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