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https://issues.apache.org/jira/browse/HADOOP-4065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12629339#action_12629339
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Pete Wyckoff commented on HADOOP-4065:
--------------------------------------
Actual interface
{code:title=TypedSplittableFile.java}
public interface TypedSplittableFile {
public void initialize(FileSystem fileSys, Path path, Configuration conf)
throws IOException;
public Class getKeyClass() ;
public Class getValueClass();
public Object next(Object key) throws IOException;
public Object getCurrentValue(Object val) throws IOException ;
public boolean syncSeen(); // i.e., atEOF()
public void sync(long position) throws IOException; // skip to past last
frame boundary
public long getPosition() throws IOException;
public void seek(long position) throws IOException;
public void close() throws IOException;
}
{code}
> 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: 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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