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https://issues.apache.org/jira/browse/HADOOP-6729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved HADOOP-6729.
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Resolution: Won't Fix
Closing as won't fix based upon Tom's comments. So it's all his fault.
> serializer.JavaSerialization should be added to io.serializations by default
> ----------------------------------------------------------------------------
>
> Key: HADOOP-6729
> URL: https://issues.apache.org/jira/browse/HADOOP-6729
> Project: Hadoop Common
> Issue Type: Improvement
> Components: conf
> Affects Versions: 0.20.2
> Reporter: Ted Yu
>
> org.apache.hadoop.io.serializer.JavaSerialization isn't included in
> io.serializations by default.
> When a class which implements the Serializable interface is used, user would
> see the following without serializer.JavaSerialization:
> java.lang.NullPointerException
> at
> org.apache.hadoop.io.serializer.SerializationFactory.getSerializer(SerializationFactory.java:73)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:759)
> at
> org.apache.hadoop.mapred.MapTask$NewOutputCollector.<init>(MapTask.java:487)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:575)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
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