serializer.JavaSerialization should be added to io.serializations by default
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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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