Re: Output.collect uses toString for custom key class. Is it possible to change this?

[Owen O'Malley]

On Dec 16, 2008, at 8:58 AM, David Coe wrote:
Thank you for your swift response.  I am getting this error when I try
your suggestion:
java.lang.NullPointerException
   at
org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:987)

It means you are trying to write a null value. Your reduce is doing  
something like:

output.collect(key, null);

In TextOutputFormat, that is ok and just skips it.  
SequenceFileOutputFormat doesn't like nulls.

-- Owen