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https://issues.apache.org/jira/browse/HADOOP-4065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12633822#action_12633822
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Doug Cutting commented on HADOOP-4065:
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> my intention was to put this in contrib/serialization, but if there is
> objection, i can change the patch to contrib/hive.
+1 I'd rather not have contrib/serialization just become a grab-bag of
io-related stuff. If this is needed by Hive only, then it belongs in
contrib/hive. If we decide (subsequently, perhaps) that it has wide utility as
a generic API for access to files in a variety of formats for a variety of
applications, then perhaps it could be moved to mapred. But that doesn't yet
sound like the consensus, so contrib/hive is probably best for now.
> support for reading binary data from flat files
> -----------------------------------------------
>
> Key: HADOOP-4065
> URL: https://issues.apache.org/jira/browse/HADOOP-4065
> Project: Hadoop Core
> Issue Type: Bug
> Components: contrib/serialization, mapred
> Reporter: Joydeep Sen Sarma
> Attachments: FlatFileReader.java, HADOOP-4065.0.txt,
> HADOOP-4065.1.txt, HADOOP-4065.1.txt, ThriftFlatFile.java
>
>
> 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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