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MapReduce framework using PHP and MySQL
MySQL を使ってカジュアルに Map/Reduce するためのフレームワーク.
これらを, SQL を意識せずに, それでいて最適化のために SQL も使えるようにする.
(GROUP BY を使った finalize とか)
Reducer にデータを渡すための SQL は以下のようなイメージ.
SELECT
key,
GROUP_CONCAT(value SEPARATOR '\n') AS values
FROM
emitted_values
GROUP BY
key
これで key と改行区切りの JSON のペアが受け取れるので, フレームワーク側で Value を配列にすることができる.
ビッグデータは無くとも, プログラミングモデルとして Map/Reduce を使いたい, というモチベーションがある.
ただし, それ MongoDB でできるよ, という話ではある.
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