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From Jiayu Ji <jiayu...@gmail.com>
Subject How does mapreduce job determine the compress codec
Date Sat, 14 Dec 2013 04:37:23 GMT
Hi

I am having this question on how does mapreduce job determine the compress
codec on hdfs. From what I read on the definitive guide (page 86)," the
CompressionCodecFactory provides a way of mapping a filename extension to a
CompressionCodec using its getCodec() method". I did a test with a lzo
compressed file without a lzo extension. However, the mapreduce job was
still able to get the right codec. Does anyone know why? Thanks in advance.

Jiayu

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