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From "Tim Broberg (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8003) Make SplitCompressionInputStream an interface instead of an abstract class
Date Sun, 29 Jan 2012 07:16:10 GMT
Make SplitCompressionInputStream an interface instead of an abstract class

                 Key: HADOOP-8003
                 URL: https://issues.apache.org/jira/browse/HADOOP-8003
             Project: Hadoop Common
          Issue Type: New Feature
          Components: io
    Affects Versions: 1.0.0, 0.23.0, 0.22.0, 0.21.0
            Reporter: Tim Broberg

To be splittable, a codec must extend SplittableCompressionCodec which has a function returning
a SplitCompressionInputStream.

SplitCompressionInputStream is an abstract class which extends CompressionInputStream, the
lowest level compression stream class.

So, no codec that wants to be splittable can reuse any code from DecompressorStream or BlockDecompressorStream.

You either have to duplicate that code, or not be splittable.

SplitCompressionInputStream adds just a few very thin functions. Can we make this an interface
rather than an abstract class to allow splittable decompression streams to extend DecompressorStream,
BlockDecompressorStream, or whatever else we should scheme up in the future?

To my knowledge, this would impact only the BZip2 codec. None of the other implement this
form of splittability yet.

LineRecordReader looks only at whether the codec is an instance of SplittableCompressionCodec,
and then calls the appropriate version of createInputStream. This would not change, so the
application code should not have to change, just BZip and SplitCompressionInputStream.

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