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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8531) SequenceFile Writer can throw out a better error if a serializer isn't available
Date Tue, 26 Jun 2012 18:53:44 GMT
Harsh J created HADOOP-8531:
-------------------------------

             Summary: SequenceFile Writer can throw out a better error if a serializer isn't
available
                 Key: HADOOP-8531
                 URL: https://issues.apache.org/jira/browse/HADOOP-8531
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Harsh J
            Priority: Trivial


Currently, if the provided Key/Value class lacks a proper serializer in the loaded config
for the SequenceFile.Writer, we get an NPE as the null return goes unchecked.

Hence we get:
{code}
java.lang.NullPointerException
	at org.apache.hadoop.io.SequenceFile$Writer.init(SequenceFile.java:1163)
	at org.apache.hadoop.io.SequenceFile$Writer.<init>(SequenceFile.java:1079)
	at org.apache.hadoop.io.SequenceFile$RecordCompressWriter.<init>(SequenceFile.java:1331)
	at org.apache.hadoop.io.SequenceFile.createWriter(SequenceFile.java:271)
{code}

We can provide a better message + exception in such cases. This is slightly related to MAPREDUCE-2584.

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