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https://issues.apache.org/jira/browse/HADOOP-9168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun A K updated HADOOP-9168:
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Labels: Hadoop InputFormat (was: )
> The Naming and Inheritance for RecordReader, LineRecordReader, LineReader
> --------------------------------------------------------------------------
>
> Key: HADOOP-9168
> URL: https://issues.apache.org/jira/browse/HADOOP-9168
> Project: Hadoop Common
> Issue Type: Improvement
> Components: util
> Affects Versions: 0.21.0, 2.0.2-alpha, 0.23.5
> Reporter: Gelesh
> Priority: Minor
> Labels: Hadoop, InputFormat
> Fix For: site, hudson, 1.2.0, 0.23.2
>
> Original Estimate: 96h
> Remaining Estimate: 96h
>
> I feel LineReader is not the correct name, since it reads up to a given
> delimiter.
> How about Text Record Reader ?
> Sounds correct but LineReader is not a RecordReader by inheritance,
> but by functionality , yes it is the Record reader.
> Now if we look at it with a different angle,
> In General,
> InputFormat would mostly has two responsibilities
> 1)To Read A split
> 2)Generate Key & Value pairs based upon the Reading done over Split.
> Now in TextInputFormat,
> Has a RecordReader, Which is inherited by LineRecordReader,
> which uses another class LineReader.
> But We Have
> LineReader, which does the reading of the file.
> LineRecordReader generates key & Value.
> I would suggest,
> RecordReader to be renamed as KeyValueGenerator,
> LineRecordReader to be renamed as TextInputKeyValueGenerator,
> LineReader to be renamed as delimitedTextReader,
> Generic attributes of LineReader (such as start, pos, end, buffer,
> bufferBytes .. etc ) to be abstracted to a class called RecordReader,
> Since its all specific to reading of the given input.
> delimitedTextReader class could extend RecordReader.
> Now the names could make better scene. We must also look into computability
> as well. It might be un fit to deploy unless a new API is introduced.
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