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From "Joydeep Sen Sarma (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4065) support for reading binary data from flat files
Date Wed, 03 Sep 2008 22:55:44 GMT
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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