Jerry He created MAPREDUCE-5728:
-----------------------------------
Summary: Guide NPE for serializer/deserializer in MapTask
Key: MAPREDUCE-5728
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5728
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: client
Affects Versions: 2.2.0
Reporter: Jerry He
Assignee: Jerry He
Priority: Minor
Fix For: 2.3.0, 2.2.1
Currently we will get NPE if the serializer/deserializer is not configured
correctly.
{code}
14/01/14 11:52:35 INFO mapred.JobClient: Task Id :
attempt_201401072154_0027_m_000002_2, Status : FAILED
java.lang.NullPointerException
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:944)
at
org.apache.hadoop.mapred.MapTask$NewOutputCollector.<init>(MapTask.java:672)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:740)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:368)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at
java.security.AccessController.doPrivileged(AccessController.java:362)
at javax.security.auth.Subject.doAs(Subject.java:573)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1502)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
{code}
serializationFactory.getSerializer and serializationFactory.getDeserializer
returns NULL in this case.
Let's guide NPE for serializer/deserializer in MapTask so that we don't get
meaningless NPE.
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