Re: getting null from CompressionCodecFactory.getCodec(Path file)

[Arun C Murthy]

On Jan 13, 2009, at 7:29 AM, Gert Pfeifer wrote:

Hi,
I want to use an lzo file as input for a mapper. The record reader
determines the codec using a CompressionCodecFactory, like this:

(Hadoop version 0.19.0)

http://hadoop.apache.org/core/docs/r0.19.0/native_libraries.html

hth,
Arun

compressionCodecs = new CompressionCodecFactory(job);

System.out.println("Using codecFactory: "+compressionCodecs.toString());

final CompressionCodec codec = compressionCodecs.getCodec(file);
System.out.println("Using codec: "+codec+" for file "+file.getName());


The output that I get is:

Using codecFactory: { etalfed_ozl.: org.apache.hadoop.io.compress.LzoCodec }

Using codec: null for file test.lzo

Of course, the mapper does not work without codec. What could be the
problem?

Thanks,
Gert