[HADOOP-3093] ma/reduce throws the following exception if "io.serializations" is not set:

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.17.0
• Fix Version/s: 0.17.0

Release Note

The following public APIs are added in org.apache.hadoop.conf.Configuration
 String[] Configuration.getStrings(String name, String... defaultValue) and
 void Configuration.setStrings(String name, String... values)

• Assignee: Amareshwari Sriramadasu
• Reporter: Runping Qi
• Created: 26/Mar/08 14:47
• Updated: 08/Jul/09 16:52
• Resolved: 02/Apr/08 08:23

Description

map/reduce throws the following exception if "io.serializations" is not set:

java.lang.NullPointerException
at org.apache.hadoop.io.serializer.SerializationFactory.<init>(SerializationFactory.java:52)
at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:325)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:177)
at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2073)

Map/reduce should use org.apache.hadoop.io.serializer.WritableSerialization as the default class as it had in the past.