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http://issues.apache.org/jira/browse/HADOOP-611?page=comments#action_12444740 ]
Devaraj Das commented on HADOOP-611:
------------------------------------
Thinking of exposing the following public APIs to the merge subsystem:
1. RawKeyValueIterator merge (List <Path> input)
2. RawKeyValueIterator merge (SegmentDescriptor segments)
//The SegmentDescriptor is a class one of whose constructors is
//SegmentDescriptor (long start, long length, Path segmentPathName).
3. void writeFile(RawKeyValueIterator records, SequenceFile.Writer writer)
throws IOException
4. SequenceFile.Writer cloneFileAttributes(FileSystem fileSys,
Path inputFile,
Path outputFile,
Progressable prog
)
throws IOException;
//This API will look at the input file attributes (compression - block/value &
codec for
//now) and apply them to the writer (so that things like compression methods
are
//preserved). The progressable is just passed to the SequenceFile.Writer
//constructor. Later on, API (3) can use the writer.
Also, the RawKeyValueIterator interface doesn't seem to require the
getTotalBytes() method. So will remove that.
> SequenceFile.Sorter should have a merge method that returns an iterator
> -----------------------------------------------------------------------
>
> Key: HADOOP-611
> URL: http://issues.apache.org/jira/browse/HADOOP-611
> Project: Hadoop
> Issue Type: New Feature
> Components: io
> Reporter: Owen O'Malley
> Assigned To: Devaraj Das
> Fix For: 0.8.0
>
>
> SequenceFile.Sorter should get a new merge method that returns an iterator
> over the keys/values.
> The current merge method should become a simple method that gets the iterator
> and writes the records out to a file.
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