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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