MapFileTest.py

#!/usr/bin/env python
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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
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#
#     http://www.apache.org/licenses/LICENSE-2.0
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from hadoop.io.IntWritable import LongWritable
from hadoop.io import MapFile

if __name__ == '__main__':
    writer = MapFile.Writer('map-test', LongWritable, LongWritable)
    writer.INDEX_INTERVAL = 2
    for i in range(0, 100, 2):
        writer.append(LongWritable(i), LongWritable(i * 10))
    writer.close()

    key = LongWritable()
    value = LongWritable()
    reader = MapFile.Reader('map-test')
    while reader.next(key, value):
        print(key, value)

    print('MID KEY', reader.midKey())
    print('FINAL KEY', reader.finalKey(key), key)

    print('GET CLOSEST')
    key.set(8)
    print(reader.get(key, value))
    print(value)
    print()

    print('GET 111')
    key.set(111)
    print(reader.get(key, value))
    print()

    key.set(25)
    print('SEEK 25 before')
    print(reader.getClosest(key, value, before=True))
    print(value)
    print()

    key.set(55)
    print('SEEK 55')
    print(reader.getClosest(key, value))
    print(value)
    print()

    reader.close()