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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