[HADOOP-6729] serializer.JavaSerialization should be added to io.serializations by default

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.20.2
• Component/s: conf
• Assignee: Unassigned
• Reporter: Ted Yu
• Created: 28/Apr/10 02:38
• Updated: 30/Jul/14 18:30
• Resolved: 30/Jul/14 18:30

Description

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)