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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-611) SequenceFile.Sorter should have a merge method that returns an iterator
Date Wed, 25 Oct 2006 21:53:18 GMT
    [ 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,
                                                                            ) 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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