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List:       hadoop-user
Subject:    MapFile.Reader and seek
From:       schnitzi <mark.schnitzius () fastsearch ! com>
Date:       2009-01-29 22:45:51
Message-ID: 21737717.post () talk ! nabble ! com
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Greetings all...  I have a situation where I want to read a range of keys and
values out of a MapFile.  So I have something like this:

    MapFile.Reader indexReader = new MapFile.Reader(fs, path.toString(),
configuration)
    boolean seekSuccess = indexReader.seek(from);
    boolean readSuccess = indexReader.next(keyValue, value);
    while (readSuccess && ...)

The problem seems to be that while seekSuccess is returning true, when I
call next() to get the value there, it's returning the value *after* the key
that I called seek() on.  So if, say, my keys are Text("id0") through
Text("id9"), and I seek for Text("id3"), calling next() will return
Text("id4") and its associated value, not Text("id3").

I would expect next() to return the key/value at the seek location, not the
one after it.  Am I doing something wrong?  Otherwise, what good is seek(),
really?
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