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Date: Wed, 3 Sep 2008 15:55:44 -0700 (PDT)
From: "Joydeep Sen Sarma (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Created: (HADOOP-4065) support for reading binary data from
 flat files
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support for reading binary data from flat files
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                 Key: HADOOP-4065
                 URL: https://issues.apache.org/jira/browse/HADOOP-4065
             Project: Hadoop Core
          Issue Type: Bug
          Components: mapred
            Reporter: Joydeep Sen Sarma


like textinputformat - looking for a concrete implementation to read binary records from a flat file (that may be compressed).

it's assumed that hadoop can't split such a file. so the inputformat can set splittable to false.

tricky aspects are:
- how to know what class the file contains (has to be in a configuration somewhere).
- how to determine EOF (would be nice if hadoop can determine EOF and not have the deserializer throw an exception  (which is hard to distinguish from a exception due to corruptions?)). this is easy for non-compressed streams - for compressed streams - DecompressorStream has a useful looking getAvailable() call - except the class is marked package private.

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